Method and apparatus for detecting atrial tachycardia

Abstract

The application provides a method and device for detecting atrial tachycardia, wherein the method for detecting atrial tachycardia comprises monitoring the total number of historical detection intervals belonging to atrial tachycardia intervals in a set time of a target pacemaker in a tracking mode; when the total number is within a first preset number range threshold, adjusting the atrioventricular delay interval duration of the target pacemaker; determining whether the total number of historical detection intervals belonging to atrial tachycardia intervals in the set time after the adjustment of the atrioventricular delay interval duration of the target pacemaker is greater than the upper limit of the first preset number range threshold; when the total number of historical detection intervals belonging to atrial tachycardia intervals in the set time after the adjustment of the atrioventricular delay interval duration of the target pacemaker is greater than the upper limit of the first preset number range threshold, it is determined that an atrial tachycardia event occurs. By adjusting the atrioventricular delay interval of the target pacemaker, the accuracy of the detection of the atrial tachycardia event is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of clinical medicine, specifically to a method and apparatus for detecting atrial tachycardia. Background Technology

[0002] Implantable medical devices are electronic therapeutic instruments implanted in the body. They deliver electrical pulses powered by a battery via a pulse generator, which are conducted through lead electrodes to stimulate the myocardium in contact with the electrodes, causing the heart to beat and contract, thereby treating cardiac dysfunction caused by certain arrhythmias. In a dual-chamber pacing mode that tracks the atria, when the atrial rate reaches a certain level, the pacemaker will operate in a 2:1 conduction mode to induce rapid ventricular pacing. Prolonged operation of the pacemaker at this ventricular pacing frequency can cause patient discomfort. To address this issue, the current common practice is to design a mode-switching function. When the pacemaker detects atrial tachycardia, it switches from atrial tracking mode to atrial non-tracking mode. In atrial non-tracking mode, the ventricular pacing rate remains at or slightly above the baseline rate and is maintained until the atrial tachycardia stops. Then, the pacemaker switches back to atrial tracking mode. Existing detection methods for atrial tachycardia include: 1. Detecting the atrial rate; when the atrial rate exceeds a preset value, atrial tachycardia is considered; 2. Combining atrial-ventricular correlation analysis; when an N:1 correlation occurs, atrial tachycardia is suspected. However, both methods have blind spots in detecting the post-ventricular atrial blank (PVAB), which may result in atrial tachycardia events going undetected, affecting the accuracy of the detection. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the blind spots in the existing detection and analysis methods, which cannot effectively detect atrial tachycardia hidden in the postventricular atrial blank period when detecting atrial tachycardia events, causing implantable medical devices to be in operation for a long time, thus causing patient discomfort. The present invention provides a method and device for detecting atrial tachycardia.

[0004] According to a first aspect, embodiments of the present invention provide a method for detecting atrial tachycardia, the method comprising:

[0005] The total number of historical detection intervals belonging to atrial tachycardia within a set time period in tracking mode for the target pacemaker;

[0006] When the total number is within a first preset number range threshold, the atrioventricular delay interval duration of the target pacemaker is adjusted;

[0007] Determine whether the total number of historical detection intervals belonging to atrial tachycardia intervals within a set time after the atrioventricular delay interval duration of the target pacemaker is greater than the upper limit of the first preset number range threshold.

[0008] When the total number of historical detection intervals belonging to atrial tachycardia intervals within the set time after the atrioventricular delay interval duration of the target pacemaker is greater than the upper limit of the first preset number range threshold, an atrial tachycardia event is determined to have occurred.

[0009] Optionally, before determining whether the total number of historical detection intervals belonging to atrial tachycardia intervals within a set time after the atrioventricular delay interval duration of the target pacemaker is greater than the upper limit of a first preset number range threshold, the method further includes:

[0010] Initiate a confirmation cycle for atrial tachycardia;

[0011] Obtain the detection sequence during the current detection interval and determine whether the order of the detection sequence is consistent with that of the target sequence;

[0012] When the detection sequence is consistent with the target sequence, the adjustment of the atrioventricular delay interval duration of the target pacemaker is maintained.

[0013] Determine whether the current detection interval is the atrial tachycardia interval;

[0014] When the current detection interval is the atrial tachycardia interval and the current detection interval is within the atrial tachycardia confirmation cycle, it is determined whether the total number of historical detection intervals belonging to atrial tachycardia intervals within the set time after the atrioventricular delay interval duration of the target pacemaker is greater than the upper limit of the first preset number range threshold.

[0015] Optionally, the total number of historical detection intervals belonging to atrial tachycardia intervals within a set time period in the tracking mode of the monitored target pacemaker includes:

[0016] Retrieve atrial sensing events during the current historical detection interval within a set time period;

[0017] Determine whether the frequency of the atrial sensing events exceeds the frequency of atrial tachycardia detection;

[0018] When the frequency of the atrial sensing events exceeds the frequency of the atrial tachycardia detection, the current historical detection interval is determined to be the atrial tachycardia interval.

[0019] Count the total number of all atrial tachycardia intervals.

[0020] Optionally, before counting the total number of all atrial tachycardia intervals, the method further includes:

[0021] When the frequency of the atrial sensing event does not exceed the frequency of the atrial tachycardia detection, it is determined whether the frequency of the atrial sensing event is greater than the second detection frequency, and the second detection frequency is less than the frequency of the atrial tachycardia detection.

[0022] When the frequency of the atrial sensing event is greater than the second detection frequency, the current historical detection interval corresponding to the atrial sensing event is determined to be a preset number of atrial tachycardia intervals, wherein the preset number is greater than 0 and less than 1.

[0023] Optionally, adjusting the atrioventricular delay interval duration of the target pacemaker includes:

[0024] Obtain the duration of the postventricular atrial blank period and the atrioventricular interventricular period;

[0025] Based on the relationship between the current detection interval and the duration of the postventricular atrial blank period and the atrioventricular interval, the duration of the atrioventricular delayed interval is adjusted.

[0026] Optionally, when the total quantity exceeds the upper limit of a first preset quantity range threshold, the method further includes:

[0027] Determine whether the number of atrial tachycardia intervals identified as integers in the total number is greater than a second preset number threshold;

[0028] When the number is greater than the second preset number threshold, it is determined whether a ventricular event has occurred in each historical detection interval where the atrial tachycardia interval is identified as an integer within a set time in the tracking mode of the monitored target pacemaker;

[0029] When the number of ventricular events that did not occur within the historical detection interval is greater than the second preset threshold, an atrial tachycardia event is determined to have occurred.

[0030] Optionally, the method further includes:

[0031] Once an atrial tachycardia event is confirmed, the target pacemaker is switched from tracking mode to non-tracking mode.

[0032] According to a second aspect, embodiments of the present invention provide a device for detecting atrial tachycardia, the device comprising:

[0033] The monitoring module is used to monitor the total number of atrial tachycardia intervals in each historical detection interval of the target pacemaker within a set time in tracking mode.

[0034] The processing module is used to adjust the atrioventricular delay interval duration of the target pacemaker when the total number is within a first preset number range threshold.

[0035] The judgment module is used to determine whether the total number of historical detection intervals belonging to atrial tachycardia intervals within a set time after the atrioventricular delay interval duration of the target pacemaker is greater than the upper limit of the first preset number range threshold.

[0036] The evaluation module is used to determine that an atrial tachycardia event has occurred when the total number of historical detection intervals belonging to atrial tachycardia intervals within a set time after the atrioventricular delay interval duration of the target pacemaker is greater than the upper limit of a first preset number range threshold.

[0037] According to a third aspect, embodiments of the present invention provide an electronic device, comprising:

[0038] A memory and a processor are communicatively connected, the memory storing computer instructions, and the processor executing the computer instructions to perform the method described in the first aspect, or any alternative embodiment of the first aspect.

[0039] According to a fourth aspect, embodiments of the present invention provide a computer-readable storage medium storing computer instructions for causing the computer to perform the method described in the first aspect, or any optional embodiment of the first aspect.

[0040] The technical solution of this invention has the following advantages:

[0041] The present invention provides a method and apparatus for detecting atrial tachycardia, which monitors the total number of historical detection intervals belonging to atrial tachycardia intervals within a set time period in tracking mode of a target pacemaker; when the total number is within a first preset number range threshold, the atrioventricular delay interval duration of the target pacemaker is adjusted; it is determined whether the total number of historical detection intervals belonging to atrial tachycardia intervals within the set time period after the adjustment of the atrioventricular delay interval duration of the target pacemaker is greater than the upper limit of the first preset number range threshold; when the total number of historical detection intervals belonging to atrial tachycardia intervals within the set time period after the adjustment of the atrioventricular delay interval duration of the target pacemaker is greater than the upper limit of the first preset number range threshold, an atrial tachycardia event is determined to have occurred. By detecting the total number of historical detection intervals belonging to atrial tachycardia within a set time period, an atrial tachycardia event is suspected when the total number falls within a first preset threshold range. The atrioventricular delay interval of the target pacemaker is adjusted to detect detection intervals hidden within the post-ventricular atrial blank period. When an atrial tachycardia interval is detected in the current detection interval, it is further determined whether the total number of historical detection intervals belonging to atrial tachycardia within the set time period after the adjustment of the atrioventricular delay interval of the target pacemaker exceeds the upper limit of the first preset threshold range. If the total number of historical detection intervals belonging to atrial tachycardia within the set time period after the adjustment of the atrioventricular delay interval of the target pacemaker exceeds the upper limit of the first preset threshold range, an atrial tachycardia event is confirmed. By adjusting the atrioventricular delay interval of the target pacemaker, hidden atrial tachycardia events can be effectively detected, improving the accuracy of atrial tachycardia event detection and significantly reducing the occurrence of patient discomfort caused by the target pacemaker being constantly operating at its maximum frequency. Attached Figure Description

[0042] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0043] Figure 1 This is a flowchart of a method for detecting atrial tachycardia according to an embodiment of the present invention;

[0044] Figure 2 This is a block diagram of an implantable medical device system for a method of detecting atrial tachycardia according to an embodiment of the present invention;

[0045] Figure 3 This is a flowchart illustrating the atrial tachycardia protection window process of the atrial tachycardia detection method according to an embodiment of the present invention.

[0046] Figure 4 This is a schematic diagram of the structure of the device for detecting atrial tachycardia according to an embodiment of the present invention;

[0047] Figure 5 This is a schematic diagram of the structure of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0048] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0050] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0051] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0052] This invention provides a method for detecting atrial tachycardia, such as... Figure 1 As shown, the method for detecting atrial tachycardia specifically includes the following steps:

[0053] Step S101: Monitor the total number of historical detection intervals belonging to atrial tachycardia within a set time period in tracking mode for the target pacemaker.

[0054] Specifically, in practical applications, the target pacemaker operates continuously in tracking mode. When the target pacemaker detects the first atrial rate exceeding the atrial tachycardia detectable rate (ATDR), it activates the atrial tachycardia protection window (ATPW). This protection window is activated after each subsequent atrial sensing event until N consecutive atrial rates are below the ATDR. Preferably, N can be 8, but this embodiment is not limited to this. By activating this protection window, atrial pacing pulse delivery in cases of atrial tachycardia can be suppressed, and the ventricular pacing frequency will operate according to the baseline frequency or the sensor-indicated frequency. The length of this protection window is M% of the interval length corresponding to the current atrial tachycardia detectable rate; for example, M can be 70. This addresses the problem that atrial pacing events delivered by the pacemaker may lead to misdiagnosis of atrial tachycardia when atrial tachycardia is suspected.

[0055] Step S102: When the total number is within the first preset number range threshold, adjust the atrioventricular delay interval duration of the target pacemaker.

[0056] In practical applications, for example, in this embodiment of the invention, the first preset quantity range threshold is 3-5 out of the most recent 8 historical detection intervals. When the total number is within the first preset quantity range threshold and a "suspected window for atrial tachycardia" (e.g., 8 seconds) persists, an atrial tachycardia event is suspected. However, due to the presence of a post-ventricular atrial blank period, the actual situation cannot be detected. This embodiment of the invention addresses the problem that the presence of a post-ventricular atrial blank period may lead to misjudgment of atrial tachycardia events when atrial tachycardia is suspected by adjusting the duration of the atrioventricular delay (AVD) of the target pacemaker to continue detecting atrial sensing events.

[0057] Specifically, in practical applications, when the total number is within the first preset threshold range and the "atrial tachycardia suspicion window" is continuously triggered, an atrial tachycardia event is suspected. By adjusting the duration of the atrioventricular delay interval, atrial sensing events during the postventricular atrial blank period can be detected, thereby improving the accuracy of judging atrial tachycardia events.

[0058] Step S103: Determine whether the total number of historical detection intervals belonging to atrial tachycardia intervals within the set time after the atrioventricular delay interval duration of the target pacemaker is greater than the upper limit of the first preset number range threshold.

[0059] Specifically, in practical applications, after the atrioventricular delay interval duration of the target pacemaker is adjusted, the total number of atrial tachycardia intervals within the historical detection intervals is counted, and it is determined whether the total number of atrial tachycardia intervals is greater than the upper limit of the first preset number range threshold. For example, the upper limit is 5.

[0060] Step S104: When the total number of historical detection intervals belonging to atrial tachycardia intervals within the set time after the atrioventricular delay interval duration of the target pacemaker is greater than the upper limit of the first preset number range threshold, an atrial tachycardia event is determined to have occurred.

[0061] Specifically, in practical applications, after the duration of the atrioventricular delay interval of the target pacemaker is adjusted, atrial sensing events within the post-ventricular atrial blank period will be detected. Historical detection intervals within the post-ventricular atrial blank period may include atrial tachycardia intervals. By counting the total number of historical detection intervals that belong to atrial tachycardia intervals after adjusting the duration of the atrioventricular delay interval, when the total number is greater than the upper limit of the first preset number range threshold, it is determined that detection criterion 1 is met, and it can be determined that an atrial tachycardia event has occurred.

[0062] This embodiment of the invention is illustrated using an example where the upper limit of the first preset quantity range threshold is 5. After adjusting the atrioventricular delay interval duration of the target pacemaker, each historical detection interval within a set time is judged. When the total number of atrial tachycardia intervals in the most recent 8 historical detection intervals is 5, it is determined that atrial tachycardia has occurred. However, the actual situation is not limited to this, and the upper limit of the first preset quantity can be set according to the actual situation.

[0063] By performing the above steps, the method for detecting atrial tachycardia provided in this embodiment of the invention monitors the total number of historical detection intervals belonging to atrial tachycardia intervals within a set time period in tracking mode of the target pacemaker; when the total number is within a first preset number range threshold, the atrioventricular delay interval duration of the target pacemaker is adjusted; it is determined whether the total number of historical detection intervals belonging to atrial tachycardia intervals within the set time period after the adjustment of the atrioventricular delay interval duration of the target pacemaker is greater than the upper limit of the first preset number range threshold; when the total number of historical detection intervals belonging to atrial tachycardia intervals within the set time period after the adjustment of the atrioventricular delay interval duration of the target pacemaker is greater than the upper limit of the first preset number range threshold, an atrial tachycardia event is determined to have occurred. By adjusting the atrioventricular delay interval of the target pacemaker to detect the detection intervals within the post-ventricular atrial blank period, when the total number of historical detection intervals belonging to atrial tachycardia intervals within the set time period is detected to be greater than the upper limit of the first preset number range threshold, an atrial tachycardia event can be determined to have occurred. By adjusting the atrioventricular delay interval of the target pacemaker, hidden atrial tachycardia events can be effectively detected. This not only improves the accuracy of atrial tachycardia event detection but also significantly reduces the occurrence of patient discomfort caused by the target pacemaker being at its operating frequency for extended periods.

[0064] Specifically, in one embodiment, step S101, which monitors the total number of historical detection intervals belonging to atrial tachycardia intervals within a set time period in tracking mode of the target pacemaker, includes the following steps:

[0065] Step S201: Obtain atrial sensing events during the current historical detection interval within a set time period.

[0066] Specifically, in practical applications, once the first atrial rate exceeding the atrial tachycardia detect rate (ATDR) is detected, an "atrial tachycardia protection window" will be activated, and monitoring will be performed on each subsequent detection interval to capture atrial sensing events within each interval. The "atrial tachycardia protection window" provided in this embodiment of the invention can effectively prevent atrial pacing events from affecting the detection of atrial tachycardia events and from potentially maintaining or exacerbating atrial tachycardia events.

[0067] Step S202: Determine whether the frequency of atrial sensing events exceeds the frequency of atrial tachycardia detection.

[0068] Specifically, in practical applications, the detection frequency for atrial tachycardia can be dynamically adjusted based on the current baseline frequency or the sensor indication frequency (when the sensor indication frequency function is enabled). The frequency is increased by Xppm, where Xppm is a doctor-programmed value that can be set within a certain range (e.g., 0–1000ppm). For example, X can be 35, 40, 45, etc., and this frequency must not be lower than the upper limit tracking frequency.

[0069] Specifically, in practical applications, the base frequency can be programmed and set by the doctor according to the patient's different conditions. For example, the base frequency can be 60 ppm, but the base frequency value in the embodiments of the present invention is not limited to this.

[0070] When patients are exercising, such as brisk walking or running, the frequency of atrial tachycardia detection can be dynamically adjusted according to the patient's different conditions, which solves the problem that the frequency of atrial tachycardia cannot accurately assess whether atrial tachycardia events have occurred during exercise.

[0071] Step S203: When the frequency of atrial sensing events exceeds the frequency of atrial tachycardia detection, the current historical detection interval is determined to be the atrial tachycardia interval.

[0072] Specifically, in practical applications, the interval is inversely proportional to the frequency. That is, when the frequency of atrial sensing events exceeds the frequency of atrial tachycardia detection, the current historical detection interval (atrial interval, i.e., AA interval) will be lower than the AA interval of the atrial tachycardia detection frequency. In other words, if the current AA_intvl is lower than the AA interval of the "atrial tachycardia detection frequency", then the AA_intvl is defined as an "atrial tachycardia interval".

[0073] Step S204: Count the total number of all atrial tachycardia intervals. Specifically, in practical applications, the most recent 8 AA intervals are judged, and the total number of atrial tachycardia intervals within these 8 AA intervals is calculated according to the above detection standard 1. When the total number is greater than the upper limit of the first preset number range threshold, it is determined that detection standard 1 is met, and an atrial tachycardia event can be confirmed.

[0074] Specifically, in one embodiment, before performing step S204, the method for detecting atrial tachycardia provided in this embodiment of the invention further includes the following steps:

[0075] Step S301: When the frequency of atrial sensing events does not exceed the frequency of atrial tachycardia detection, determine whether the frequency of atrial sensing events is greater than the second detection frequency, and the second detection frequency is less than the frequency of atrial tachycardia detection.

[0076] Specifically, in practical applications, existing methods for judging atrial tachycardia events do not consider the possibility of atrial tachycardia events occurring even when the current historical detection interval is shorter than the atrial tachycardia detection interval; that is, they do not comprehensively consider the possibility of atrial tachycardia. The embodiments of this invention, based on existing detection standards, fully consider the gaps in existing detection standards, improve detection standard 1, and greatly enhance the accuracy of detection.

[0077] Step S302: When the frequency of atrial sensing events is greater than the second detection frequency, determine that the current historical detection interval corresponding to the atrial sensing event is a preset number of atrial tachycardia intervals, where the preset number is greater than 0 and less than 1.

[0078] Specifically, in practical applications, to improve the accuracy of detection, the embodiments of the present invention have supplemented detection standard 1, as follows:

[0079] (1) If the frequency of the current AA interval exceeds the "atrial tachycardia detection frequency", then the AA_intvl is defined as an "atrial tachycardia interval";

[0080] (2) If the current AA interval satisfies (AA_intvl / 2) being less than the AA interval (ATDR_intvl) of the “atrial tachycardia detection frequency”, and (AA_intvl / 2) being less than (SAV+PAVB), then AA_intvl is defined as 0.5 “atrial tachycardia intervals”, where SAV is the sensed AV interval and PAVB is the post-atrial ventricular blanking.

[0081] The embodiments of the present invention improve and supplement detection standard 1, thereby solving the problem that a single atrial rate judgment cannot accurately assess atrial tachycardia events.

[0082] Specifically, in one embodiment, when the total quantity is greater than the upper limit of the first preset quantity range threshold, the method further includes the following steps:

[0083] Step S401: Determine whether the number of atrial tachycardia intervals identified as integers in the total number is greater than the second preset number threshold.

[0084] Step S402: When the number is greater than the second preset quantity threshold, determine whether a ventricular event has occurred in each historical detection interval where the atrial tachycardia interval is identified as an integer within a set time in the tracking mode of the monitoring target pacemaker.

[0085] Step S403: When the number of ventricular events that did not occur within the historical detection interval is greater than the second preset threshold, it is determined that an atrial tachycardia event has occurred.

[0086] Specifically, in practical applications, the total number is determined by statistical analysis using (1) and (2) in detection standard 1. When the total number is greater than the upper limit of the first preset number threshold of 5, the number of atrial tachycardia intervals identified as integers in the total number will be calculated to determine whether it is greater than the second preset number threshold. When the number is greater than the second preset number threshold, a ventricular event will be determined for each historical detection interval identified as an integer. When the number of ventricular events that did not occur in the historical detection interval is greater than the second preset number threshold, an atrial tachycardia event is determined to have occurred.

[0087] For example, the second preset quantity threshold can be 3. That is, when the number of atrial tachycardia intervals identified as integers is 3, the atrial tachycardia intervals identified as integers are judged to determine whether a ventricular conduction event has occurred. When the number of non-ventricular events is greater than 3, it is determined that an atrial tachycardia event has occurred.

[0088] Specifically, in practical applications, to further improve the accuracy of detection, this embodiment of the invention adds a second detection standard to the existing detection standard 1. Detection standard 1 and detection standard 2 are combined to detect and determine whether an atrial tachycardia event has occurred. That is, when the target pacemaker simultaneously meets both detection standard 1 and detection standard 2, an atrial tachycardia event is considered detected. This dual determination further improves the accuracy of detection.

[0089] Specifically, the contents of testing standard 2 are as follows:

[0090] The most recent 8 AA intervals are evaluated. If more than a second preset threshold number of AA intervals are atrial tachycardia intervals and no ventricular events occur within the AA intervals, then the test is deemed to be satisfied. Preferably, the second preset threshold number in test criterion 2 can be 3, that is, if 3 or more of the most recent 8 AA intervals are atrial tachycardia intervals and no ventricular events are conducted, then test criterion 2 is satisfied.

[0091] Specifically, in practical applications, when making a judgment on detection standard 2, the condition for determining whether the AA interval is an atrial tachycardia interval is referred to in (1) of detection standard 1. That is, the AA interval in (2) of detection standard 1 is not included in the judgment of detection standard 2 because it is a non-integer AA interval.

[0092] When the target pacemaker detects the most recent 8 AA intervals, if both detection criteria 1 and 2 are met, an atrial tachycardia event is determined to have been detected; if neither detection criteria 1 nor 2 is met, no atrial tachycardia event is determined to have been detected, and the target pacemaker will continue to operate in tracking mode.

[0093] Specifically, in one embodiment, when performing step S102 above, adjusting the atrioventricular delay interval duration of the target pacemaker further includes the following steps:

[0094] Step S501: Obtain the duration of the postventricular atrial blank period and the atrioventricular interventricular period.

[0095] Step S502: Adjust the duration of the atrioventricular delay interval based on the relationship between the duration of the postventricular atrial blank period and the atrioventricular interval.

[0096] When a "suspected window for atrial tachycardia" is detected and one of the two criteria is met, it is suspected that there is a postventricular atrial blank period shielding, which may result in an atrial tachycardia event that cannot be detected. In this case, the atrioventricular delay interval duration of the target pacemaker will be adjusted to detect the shielding period.

[0097] Specifically, the duration of the "suspected window for atrial tachycardia" can be set to 8 seconds, but the actual timeframe is not limited to this.

[0098] Specifically, in practical applications, embodiments of the present invention provide two adjustment strategies to better detect the shielding period and avoid situations where the presence of a postventricular atrial blank period shielding results in a blind zone that cannot detect atrial tachycardia events within the blind zone, ultimately affecting the accuracy of the detection.

[0099] Specifically, in practical applications, the specific details of the strategy adjustment are as follows:

[0100] Adjustment Strategy 1: If the current minimum AA interval is greater than SAVD+(PVAB / 2) and less than SAVD+PVAB, then reduce AVD=AVD-(PVAB / 2), and the minimum AVD is not less than 30ms.

[0101] Adjustment Strategy 2: If the current minimum AA interval is greater than SAVD and less than SAVD+1 / 2PVAB, then the extended AVD = AVD+(PVAB / 2), and the maximum AVD is no greater than 300ms.

[0102] Among them, SAVD stands for atrioventricular interval; PVAB stands for postventricular atrial blank period; AVD stands for atrioventricular delayed interval, which includes SAVD and PAVD (Pacing Atrioventricular Delay).

[0103] Specifically, in one embodiment, before performing step S103 to determine whether the total number of historical detection intervals belonging to atrial tachycardia intervals within the set time after the atrioventricular delay interval duration of the target pacemaker is greater than the upper limit of the first preset number range threshold, the following steps are further included:

[0104] Step S601: Start the atrial tachycardia confirmation cycle.

[0105] Specifically, in practical applications, to ensure the effectiveness of the detection, this embodiment of the invention sets an atrial tachycardia confirmation cycle. When the total number is within a first preset number range threshold, it is suspected that there is a postventricular atrial blank period shielding. At this time, the atrial tachycardia confirmation cycle will be started. The cycle duration can be controlled by the doctor through a program. For example, the cycle duration can be 10 seconds, but this embodiment of the invention is not limited to this.

[0106] Step S602: Obtain the detection sequence of the current detection interval and determine whether the order of the detection sequence is consistent with that of the target sequence.

[0107] For example, in practical applications, the target sequence for adjusting strategy one can be AS / AP-VP-AR.

[0108] Step S603: When the detection sequence is consistent with the target sequence, maintain the adjustment of the atrioventricular delay interval duration of the target pacemaker.

[0109] Step S604: Determine whether the current detection interval is the atrial tachycardia interval.

[0110] Step S605: When the current detection interval is the atrial tachycardia interval and the current detection interval is within the atrial tachycardia confirmation cycle, determine whether the total number of historical detection intervals belonging to the atrial tachycardia interval within the set time after the atrioventricular delay interval duration of the target pacemaker is greater than the upper limit of the first preset number range threshold.

[0111] Specifically, in practical applications, after adjusting the AVD according to adjustment strategy one or adjustment strategy two, it will immediately detect whether there is a hidden AA interval. If so, the adjustment of this AVD will be maintained until no hidden AA interval is detected within a cycle or the "atrial tachycardia event confirmation cycle" ends.

[0112] Specifically, the detection of hidden AA intervals is as follows: After adjusting AVD using adjustment strategy one, if an AS / AP-VP-AR sequence is subsequently detected and the AA interval of that sequence is an "atrial tachycardia interval," then a hidden AA interval is considered to have been detected. Similarly, after adjusting AVD using adjustment strategy two, if an AS / AP-AR sequence is subsequently detected and the AA interval of that sequence is an "atrial tachycardia interval," then a hidden AA interval is considered to have been detected.

[0113] Specifically, in one embodiment, after performing the above step S104, when the total number of historical detection intervals belonging to atrial tachycardia intervals within the set time after the atrioventricular delay interval duration of the target pacemaker is greater than the upper limit of the first preset number range threshold, and after determining that an atrial tachycardia event has occurred, the following steps are further included:

[0114] Step S105: After confirming that an atrial tachycardia event has occurred, the target pacemaker is switched from tracking mode to non-tracking mode.

[0115] Specifically, in practical applications, once an atrial tachycardia event is confirmed, the target pacemaker will switch from tracking mode to non-tracking mode until the atrial tachycardia ends.

[0116] Specifically, such as Figure 2 As shown, the implantable medical device system comprises an implantable medical device (i.e., the target pacemaker) 1 and an external device 10. The target pacemaker 1 consists of a ventricular sensing module 2, a ventricular pacing module 3, a non-linear pacing control module 4, a clock / timing module 5, a pacing control module 6, a storage module 7, and a treatment control module 9. Specifically, the atrial sensing module 2 senses the heart's own activity signals and transmits them to the pacing control module 6. The clock / timing module 5 records the time when the atrial sensing module 2 senses the heart's own activity signals. The pacing control module 6 calculates the current AA interval based on the time recorded by the clock / timing module 5, and simultaneously controls the clock / timing module 5 to time the pacing interval according to the current operating status. After the clock / timing module 5 completes the interval, it notifies the pacing control module 6. The pacing control module 6 then controls the atrial pacing module 3 to deliver atrial pacing pulses according to the current operating parameters (e.g., currently in tracking mode). The treatment control module 9 can modify the operating parameters in the storage module 7 based on the current treatment function (such as the atrial tachycardia detection function) or the patient's status (such as detecting whether atrial tachycardia has occurred). For example, after detecting atrial tachycardia, the operating mode is switched to non-tracking mode. The updated operating parameters in the storage module 7 are transmitted to the pacing control module 6, and the pacing control module 6 controls the pacing timing and pacing delivery according to the new operating parameters.

[0117] The external device 10 is connected to the non-threaded control module 4 of the target pacemaker 1 wirelessly. The external device 10 can modify the operating parameters in the implantable medical device through wireless communication, and the target pacemaker 1 can send internal data to the external device 10 through the non-threaded control module 4.

[0118] By performing the above steps, the method for detecting atrial tachycardia provided in this embodiment of the invention monitors the total number of historical detection intervals belonging to atrial tachycardia intervals within a set time period in tracking mode of the target pacemaker; when the total number is within a first preset number range threshold, the atrioventricular delay interval duration of the target pacemaker is adjusted; it is determined whether the total number of historical detection intervals belonging to atrial tachycardia intervals within the set time period after the adjustment of the atrioventricular delay interval duration of the target pacemaker is greater than the upper limit of the first preset number range threshold; when the total number of historical detection intervals belonging to atrial tachycardia intervals within the set time period after the adjustment of the atrioventricular delay interval duration of the target pacemaker is greater than the upper limit of the first preset number range threshold, an atrial tachycardia event is determined to have occurred. By detecting the total number of historical detection intervals belonging to atrial tachycardia within a set time period, an atrial tachycardia event is suspected when the total number falls within a first preset threshold range. The atrioventricular delay interval of the target pacemaker is adjusted to detect the detection intervals within the post-ventricular atrial blank period. When an atrial tachycardia interval is detected in the current detection interval, it is further determined whether the total number of historical detection intervals belonging to atrial tachycardia within the set time period after the adjustment of the atrioventricular delay interval of the target pacemaker exceeds the upper limit of the first preset threshold range. If the total number of historical detection intervals belonging to atrial tachycardia within the set time period after the adjustment of the atrioventricular delay interval of the target pacemaker exceeds the upper limit of the first preset threshold range, an atrial tachycardia event is confirmed. By adjusting the atrioventricular delay interval of the target pacemaker, hidden atrial tachycardia events can be effectively detected, which not only improves the accuracy of atrial tachycardia event detection but also significantly reduces the occurrence of patient discomfort caused by the target pacemaker being constantly operating at its maximum frequency.

[0119] The following will provide a detailed description of the method for detecting atrial tachycardia provided in the embodiments of the present invention, with reference to specific application examples.

[0120] Combination Figure 1-3 As shown, the specific implementation process is as follows:

[0121] 1. When the target pacemaker detects the first atrial rate exceeding the atrial tachycardia detectable rate (ATDR), the atrial tachycardia protection window (ATPW) is opened. This window is opened after each subsequent atrial sensing event until N consecutive (e.g., 8) atrial rates are below the ATDR. During this protection window, atrial pacing pulse delivery is suppressed, and the ventricular pacing frequency operates according to the baseline frequency or the sensor-indicated frequency. Figure 3 As shown. The length of this window is M% (e.g., 70%) of the cycle length corresponding to the current atrial tachycardia detection frequency.

[0122] The specific processing procedure is as follows:

[0123] (1) Atrial sensing events were detected (atrial sensing events before and after the postventricular atrial blank period were detected, and the same applies below);

[0124] (2) Determine whether the current AA interval is an atrial tachycardia interval:

[0125] If yes, then open the "Atrial Tachycardia Protection Window"; if not, further determine whether N consecutive AA intervals are not atrial tachycardia intervals. If N consecutive AA intervals are not atrial tachycardia intervals, then close the atrial tachycardia protection window; otherwise, keep the atrial tachycardia protection window open.

[0126] In practical applications, the "atrial sensing-atrial pacing" interval exceeding the detection frequency of atrial tachycardia is not considered to reflect the heart's own rate and therefore should not be included in the assessment of atrial tachycardia. This protection window can prevent inappropriate atrial pacing from interfering with the detection of atrial tachycardia events, and can also prevent inappropriate atrial pacing from acting as a new excitation source to maintain or exacerbate atrial tachycardia. Setting the window length as a percentage of the cycle length corresponding to the current atrial tachycardia detection frequency allows for a more reasonable configuration of the window's effective range.

[0127] 2. The frequency of the atrial tachycardia detection can be dynamically adjusted based on the current baseline frequency or the sensor indication frequency (when the sensor indication frequency function is enabled). The frequency is increased by Xppm based on the current baseline frequency or the sensor indication frequency, where Xppm is the doctor's programmed value, and this frequency is not lower than the upper limit tracking frequency.

[0128] During operation, the inherent demand is relatively high, requiring a high frequency. If the atrial tachycardia detection frequency cannot meet the higher frequency requirements during operation, inappropriate atrial tachycardia determination may occur during exercise, leading to inappropriate mode switching and thus failing to meet the higher frequency requirements during exercise. This technical feature can effectively adapt to tachycardia detection under different operational needs.

[0129] 3. An atrial tachycardia event is considered to have been detected if the target pacemaker detects an event that meets all of the following criteria.

[0130] Detection Standard 1: Five or more atrial tachycardia intervals out of the most recent eight AA intervals, where an atrial tachycardia interval is defined as:

[0131] A1. An AA interval exceeding the detection frequency of atrial tachycardia is defined as an atrial tachycardia interval;

[0132] A2. If (AA_intvl / 2) is less than ATDR_intvl and less than (SAV+PAVB), it is defined as 0.5 atrial tachycardia intervals. This AA interval is not included in the determination of the following test standard 2.

[0133] Detection standard 2: Three or more of the most recent eight AA intervals are atrial tachycardia intervals and there are no conducted ventricular events.

[0134] The specific processing procedure is as follows:

[0135] (1) An atrial sensing event was detected;

[0136] (2) Determine whether it is within the atrial tachycardia event confirmation period:

[0137] If not within the atrial tachycardia event confirmation period, the atrial tachycardia event is detected normally. The detection process is as follows: determine if detection criterion 1 is met; if so, determine if detection criterion 2 is met; if both are met, an atrial tachycardia event is considered detected, and the target pacemaker switches modes from tracking to non-tracking. If only detection criterion 1 or criterion 2 is met, it is considered to be within the period of suspected atrial tachycardia event, where there may be a hidden AA interval. Hidden AA interval detection is required, and the suspected atrial tachycardia event detection process begins. If both detection criteria 1 and criterion 2 are not met, it is determined that no atrial tachycardia event has occurred.

[0138] Simply having an atrial rate exceeding the detection frequency for atrial tachycardia is not enough to accurately determine the occurrence of an atrial tachycardia event. Atrial tachycardia events are usually accompanied by AV block (atrioventricular block) or 2:1 conduction. Therefore, by combining atrial rate and whether the atrial event is conducted, a more accurate detection of atrial tachycardia events can be achieved.

[0139] 4. If the target pacemaker detects a sustained "atrial tachycardia suspicion window" (this interval is used to identify whether the suspected phenomenon is sustainable; if it is a single event, it is ignored) while meeting one of the two criteria in "3", an atrial tachycardia event is suspected. At this point, it is suspected that an atrial sensing event is masked by the postventricular atrial blank period. The atrioventricular delay interval (AVD) is adjusted to determine if there is an AA interval hidden by the postventricular atrial blank period (PVAB). Simultaneously, an atrial tachycardia event confirmation cycle is initiated. The length of this cycle can be programmed by the physician, such as 10 seconds. This interval is used to confirm whether the hidden AA interval discovered through the detection process (judged after AVD adjustment, as described below) is sustainable. Only the existence of a sustainable hidden AA interval can ultimately confirm the suspicion, i.e., an atrial tachycardia event has occurred.

[0140] The process for detecting hidden AA intervals is as follows:

[0141] Adjustment Strategy 1: If the current minimum AA interval is greater than SAVD + (PVAB / 2) but less than SAVD + PVAB, then reduce AVD = AVD - (PVAB / 2), and the minimum AVD should not be less than 30ms. Immediately after adjusting AVD, check if there is a hidden AA interval. If so, maintain the adjustment of AVD until no hidden AA interval is detected within a cycle or the atrial tachycardia event confirmation cycle ends. If an AS / AP-VP-AR sequence is detected and the current AA interval is an atrial tachycardia interval, then a hidden AA interval is considered to have been detected.

[0142] Adjustment Strategy 2: If the current minimum AA interval is greater than SAVD and less than SAVD + 1 / 2PVAB, then expand AVD = AVD + (PVAB / 2), and the maximum AVD is no greater than 300ms. After adjusting AVD, immediately check if there is a hidden AA interval. If so, maintain the adjustment of this AVD until no hidden AA interval is detected within a cycle or the atrial tachycardia event confirmation cycle ends. If an AS / AP-AR sequence is detected and the current AA interval is an "atrial tachycardia interval", then a hidden AA interval is considered to have been detected.

[0143] AVD includes SAVD and PAVD. After adjustment by the above adjustment strategy one or adjustment strategy two, if the detection criteria described in "3" are met when the atrial tachycardia event confirmation period ends, the atrial tachycardia event is immediately confirmed to have been detected; otherwise, the atrial tachycardia event confirmation period is directly terminated.

[0144] The AVD+1 / 2PVAB interval is used to distinguish whether atrial sensing is masked in the first or second half of the PVAB interval. If it is in the first half, the AVD is increased; if it is in the second half, the AVD is decreased. This allows for more targeted detection of hidden AA intervals. Immediately checking for hidden AA intervals after each adjustment prevents prolonged, ineffective AVD expansion from causing abnormal cardiac timing.

[0145] 5. Following the process described in "4" above, the atrial tachycardia event confirmation cycle and hidden AA interval detection procedure are initiated. If an atrial tachycardia event confirmation cycle is detected at this time, further detection is performed to determine whether the atrial tachycardia event confirmation cycle has expired (the duration of the atrial tachycardia confirmation cycle is programmed by the physician, for example, 10 seconds):

[0146] (1) If the period has not expired, it is still in the suspected confirmation process. At this time, it is necessary to further determine whether the hidden AA interval detection process has been started:

[0147] ① If enabled, a hidden AA interval determination is performed (the determination process is as described in "4" above). If the determination result indicates the existence of a hidden AA interval, the hidden AA interval detection process is maintained. If the determination result indicates the absence of a hidden AA interval, the hidden AA interval detection process is disabled and AVD is restored. In this case, it is determined that there is no hidden AA interval, so there is no need to continue maintaining AVD adjustment or performing the hidden AA interval detection process again. This can prevent abnormal cardiac timing caused by prolonged ineffective AVD expansion.

[0148] ② If not enabled (the hidden AA interval detection process was disabled in step ①), exit directly and wait for the atrial tachycardia event confirmation period to expire.

[0149] (2) If the period expires, further determine whether the detection criteria 1 and 2 are met after the hidden AA interval detection process. If they are met, it is considered that an atrial tachycardia event has been detected and the mode is switched. Otherwise, if they are not met, the atrial tachycardia event confirmation cycle can be exited directly and the atrial tachycardia event detection can continue according to the process.

[0150] Once an atrial tachycardia event is detected, the mode is immediately switched to non-tracking mode until the atrial tachycardia ends.

[0151] The system monitors the total number of historical detection intervals belonging to atrial tachycardia within a set time period in tracking mode of the target pacemaker. When the total number is within a first preset threshold range, the atrioventricular delay interval duration of the target pacemaker is adjusted. It then determines whether the total number of historical detection intervals belonging to atrial tachycardia within the set time period after the adjustment of the atrioventricular delay interval duration of the target pacemaker is greater than the upper limit of the first preset threshold range. If the total number of historical detection intervals belonging to atrial tachycardia within the set time period after the adjustment of the atrioventricular delay interval duration of the target pacemaker is greater than the upper limit of the first preset threshold range, an atrial tachycardia event is determined to have occurred. By combining two detection standards, the problem of inaccurate determination of atrial tachycardia events by relying solely on atrial rate was solved. By timely adjusting the duration of the atrioventricular delay interval and detecting the hidden AA interval, the problem of failing to identify atrial sensing events shielded by PVAB was solved. By introducing an atrial tachycardia protection window, the problem of misjudging "atrial tachycardia events" due to atrial pacing events delivered by the pacemaker when atrial pacing events are suspected was solved. While effectively identifying shielded atrial sensing events, the detection accuracy of atrial tachycardia events was improved, and the occurrence of patient discomfort caused by the target pacemaker being at the operating frequency for a long time was significantly reduced.

[0152] This invention provides a device for detecting atrial tachycardia, such as... Figure 4 As shown, the device for detecting atrial tachycardia includes:

[0153] The monitoring module 101 is used to monitor the total number of atrial tachycardia intervals in each historical detection interval of the target pacemaker within a set time period in tracking mode. For details, please refer to the relevant description of step S101 in the above method embodiment, which will not be repeated here.

[0154] The processing module 102 is used to adjust the atrioventricular delay interval duration of the target pacemaker when the total number is within a first preset threshold range. For details, please refer to the relevant description of step S102 in the above method embodiments, which will not be repeated here.

[0155] The judgment module 103 is used to determine whether the total number of historical detection intervals belonging to atrial tachycardia intervals within a set time after the atrioventricular delay interval duration of the target pacemaker is greater than the upper limit of a first preset number range threshold. For details, please refer to the relevant description of step S103 in the above method embodiment, which will not be repeated here.

[0156] The evaluation module 104 is used to determine that an atrial tachycardia event has occurred when the total number of historical detection intervals belonging to atrial tachycardia intervals within a set time after the atrioventricular delay interval duration of the target pacemaker is greater than the upper limit of a first preset number range threshold. For details, please refer to the relevant description of step S104 in the above method embodiment, which will not be repeated here.

[0157] For a further description of the device for detecting atrial tachycardia described above, please refer to the relevant description of the embodiments of the method for detecting atrial tachycardia described above, which will not be repeated here.

[0158] Through the synergistic cooperation of the aforementioned components, the atrial tachycardia detection device provided in this embodiment of the invention detects the total number of historical detection intervals belonging to atrial tachycardia intervals within a set time period. When the total number is within a first preset threshold range, an atrial tachycardia event is suspected. By adjusting the atrioventricular delay interval of the target pacemaker, the detection intervals within the post-ventricular atrial blank period are detected. When the total number of historical detection intervals belonging to atrial tachycardia intervals within the set time period after the atrioventricular delay interval duration adjustment exceeds the upper limit of the first preset threshold range, an atrial tachycardia event is confirmed to have occurred. By adjusting the atrioventricular delay interval of the target pacemaker, hidden atrial tachycardia events can be effectively detected, which not only improves the accuracy of atrial tachycardia event detection but also significantly reduces the occurrence of patient discomfort caused by the target pacemaker being constantly operating at its maximum frequency.

[0159] This invention provides an electronic device, such as... Figure 5 As shown, the electronic device includes a processor 901 and a memory 902, which are communicatively connected to each other. The processor 901 and the memory 902 can be connected via a bus or other means. Figure 5 Taking the example of a connection between China and Israel via a bus.

[0160] Processor 901 can be a Central Processing Unit (CPU). Processor 901 can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or combinations of the above types of chips.

[0161] The memory 902, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as the program instructions / modules corresponding to the methods in the embodiments of the present invention. The processor 901 executes various functional applications and data processing of the processor 901 by running the non-transitory software programs, instructions, and modules stored in the memory 902, thereby implementing the methods in the above-described method embodiments.

[0162] The memory 902 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created by the processor 901, etc. Furthermore, the memory 902 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 902 may optionally include memory remotely located relative to the processor 901, and these remote memories may be connected to the processor 901 via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0163] One or more modules are stored in memory 902, and when executed by processor 901, they perform the methods described in the above method embodiments.

[0164] The specific details of the aforementioned electronic device can be understood by referring to the relevant descriptions and effects in the above method embodiments, and will not be repeated here.

[0165] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The implemented program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk drive (HDD), or solid-state drive (SSD), etc.; the storage medium can also include combinations of the above types of memory.

[0166] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for detecting atrial tachycardia, characterized in that, include: The total number of historical detection intervals belonging to atrial tachycardia within a set time period in tracking mode for the target pacemaker; When the total number is within a first preset number range threshold, the atrioventricular delay interval duration of the target pacemaker is adjusted; Determine whether the total number of historical detection intervals belonging to atrial tachycardia intervals within a set time after the atrioventricular delay interval duration of the target pacemaker is greater than the upper limit of the first preset number range threshold. When the total number of historical detection intervals belonging to atrial tachycardia intervals within a set time after the atrioventricular delay interval duration of the target pacemaker is greater than the upper limit of the first preset number range threshold, an atrial tachycardia event is determined to have occurred. The total number of historical detection intervals belonging to atrial tachycardia intervals within a set time period in tracking mode for the monitored target pacemaker includes: Retrieve atrial sensing events during the current historical detection interval within a set time period; Determine whether the frequency of the atrial sensing events exceeds the frequency of atrial tachycardia detection; When the frequency of the atrial sensing events exceeds the frequency of the atrial tachycardia detection, the current historical detection interval is determined to be the atrial tachycardia interval. Count the total number of all atrial tachycardia intervals; Before calculating the total number of all atrial tachycardia intervals, the following is also included: When the frequency of the atrial sensing event does not exceed the frequency of the atrial tachycardia detection, it is determined whether the frequency of the atrial sensing event is greater than the second detection frequency, and the second detection frequency is less than the frequency of the atrial tachycardia detection. When the frequency of the atrial sensing event is greater than the second detection frequency, the current historical detection interval corresponding to the atrial sensing event is determined to be a preset number of atrial tachycardia intervals, wherein the preset number is greater than 0 and less than 1.

2. The method according to claim 1, characterized in that, Before determining whether the total number of historical detection intervals belonging to atrial tachycardia intervals within a set time after the atrioventricular delay interval duration of the target pacemaker is greater than the upper limit of a first preset number range threshold, the method further includes: Initiate a confirmation cycle for atrial tachycardia; Obtain the detection sequence during the current detection interval and determine whether the order of the detection sequence is consistent with that of the target sequence; When the detection sequence is consistent with the target sequence, the adjustment of the atrioventricular delay interval duration of the target pacemaker is maintained. Determine whether the current detection interval is the atrial tachycardia interval; When the current detection interval is the atrial tachycardia interval and the current detection interval is within the atrial tachycardia confirmation cycle, it is determined whether the total number of historical detection intervals belonging to atrial tachycardia intervals within the set time after the atrioventricular delay interval duration of the target pacemaker is greater than the upper limit of the first preset number range threshold.

3. The method according to claim 1, characterized in that, The adjustment of the atrioventricular delay interval duration of the target pacemaker includes: Obtain the duration of the postventricular atrial blank period and the atrioventricular interventricular period; Based on the relationship between the current detection interval and the duration of the postventricular atrial blank period and the atrioventricular interval, the duration of the atrioventricular delayed interval is adjusted.

4. The method according to claim 1, characterized in that, When the total quantity exceeds the upper limit of a first preset quantity range threshold, the method further includes: Determine whether the number of atrial tachycardia intervals identified as integers in the total number is greater than a second preset number threshold; When the number is greater than the second preset number threshold, it is determined whether a ventricular event has occurred in each historical detection interval where the atrial tachycardia interval is identified as an integer within a set time in the tracking mode of the monitored target pacemaker; When the number of ventricular events that did not occur within the historical detection interval is greater than the second preset threshold, an atrial tachycardia event is determined to have occurred.

5. The method according to claim 1, characterized in that, The method further includes: Once an atrial tachycardia event is confirmed, the target pacemaker is switched from tracking mode to non-tracking mode.

6. A device for detecting atrial tachycardia, characterized in that, include: The monitoring module is used to monitor the total number of atrial tachycardia intervals in each historical detection interval of the target pacemaker within a set time in tracking mode. The processing module is used to adjust the atrioventricular delay interval duration of the target pacemaker when the total number is within a first preset number range threshold. The judgment module is used to determine whether the total number of historical detection intervals belonging to atrial tachycardia intervals within a set time after the atrioventricular delay interval duration of the target pacemaker is greater than the upper limit of the first preset number range threshold. The evaluation module is used to determine that an atrial tachycardia event has occurred when the total number of historical detection intervals belonging to atrial tachycardia intervals within a set time after the atrioventricular delay interval duration of the target pacemaker is greater than the upper limit of a first preset number range threshold. The total number of historical detection intervals belonging to atrial tachycardia intervals within a set time period in tracking mode for the monitored target pacemaker includes: Retrieve atrial sensing events during the current historical detection interval within a set time period; Determine whether the frequency of the atrial sensing events exceeds the frequency of atrial tachycardia detection; When the frequency of the atrial sensing events exceeds the frequency of the atrial tachycardia detection, the current historical detection interval is determined to be the atrial tachycardia interval. Count the total number of all atrial tachycardia intervals; Before calculating the total number of all atrial tachycardia intervals, the following is also included: When the frequency of the atrial sensing event does not exceed the frequency of the atrial tachycardia detection, it is determined whether the frequency of the atrial sensing event is greater than the second detection frequency, and the second detection frequency is less than the frequency of the atrial tachycardia detection. When the frequency of the atrial sensing event is greater than the second detection frequency, the current historical detection interval corresponding to the atrial sensing event is determined to be a preset number of atrial tachycardia intervals, wherein the preset number is greater than 0 and less than 1.

7. An electronic device, characterized in that, include: A memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, the processor executing the computer instructions to perform the method as described in any one of claims 1-5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to perform the method as described in any one of claims 1-5.

Images