9 results about "Av delay" patented technology

Systems and methods are provided for detecting arrhythmias in cardiac activity is provided. The systems and methods include measuring conduction delays between an atria (A) and multiple left ventricular (LV) electrodes to obtain multiple intrinsic A / LV intervals, measuring conduction delays between a right ventricular (RV) and the multiple LV electrodes to obtain multiple intrinsic VV intervals. The systems and methods include calculating a first atrial ventricular (AV) delay based on at least one of the intrinsic A / LV intervals, and calculating a second AV delay based on at least one of the intrinsic VV intervals. The systems and methods include selecting a biventricular (BiV) pacing mode or an LV only pacing mode based on a relation between the first and second AV delays, and delivering a pacing therapy based on the selecting operation.

A system and method are provided for managing atrial-ventricular (AV) delay adjustments. An AV interval is measured that corresponds to an interval between an atrial paced (Ap) event or an atrial sensed (As) event and a sensed ventricular (Vs) event. A candidate AV delay is set based on the AV interval and a bundle branch adjustment (BBA) value. A QRS characteristic of interest (COI) is measured while utilizing the candidate AV delay in connection with delivering a pacing therapy. The BBA value is adjusted and the candidate AV delay is reset based on the BBA value as adjusted. A collection of QRS COIs and corresponding candidate AV delays are obtained and one of the candidate AV delays is selected as a BBA AV delay. The pacing therapy is managed, based on the BBA AV delay.

Methods and systems are provided for a rate adaptive bi-ventricular fusion pacing. The methods and systems deliver a first pulse at a left ventricular (LV) lead and a second pulse at a right ventricular (RV) lead based on a paced atrio-ventricular (AV) delay. The first pulse timed to be delivered concurrently with an intrinsic ventricular conduction. The methods and systems further repeat the delivery of the first pulse and the second pulse for a predetermined number of cycles. Additionally, the methods and systems measure an intrinsic AV conduction interval, and adjust the paced AV delay based on the intrinsic AV conduction interval and a negative hysteresis delta.

An implantable medical device (IMD) (210) for managing therapy is provided that is couplable to a lead (220, 224) with an electrode (222, 232), a memory (294) configured to store program instructions and one or more processors (260). The one or more processors (260) can be configured to execute the program instructions to determine a sensed right atrium (RAs) event or a paced right atrial (RAp) event (RAs,p event) (412), determine a sensed right ventricle (RVs) event (414) by detecting a cardiac activity (CA) signal (402) reaches a threshold amplitude (410) and determine a maximum amplitude (420) in a determined period of time (418) after the CA signal (402) reaches the threshold amplitude (410), and determine an RAs,p-RVs interval (404) between the RAs,p event (412) and RVs event (414). The one or more processors (260) can also be configured to calculate an atrioventricular delay (AV) delay based on the RAs,p-RVs interval (404), and manage therapy, provided by the IMD (210), based on the AV delay that is calculated.

Illustrative devices and methods may use an adaptable rate-responsive atrioventricular (AV) delay profile to deliver cardiac fusion pacing therapy. The rate response AV delay profile may generate an AV therapy delay based on the heart rate, and the rate response AV delay profile may be adapted based on an innate AV delay of intermittent sampling.

An implantable medical device (IMD) for managing therapy is provided that can include a lead with an electrode, a memory configured to store program instructions and one or more processors. The one or more processors can be configured to execute the program instructions to determine a sensed right atrium (RAs) event or a paced right atrial (RAp) event (RAs,p event), determine a sensed right ventricle (RVs) event by detecting a cardiac activity (CA) signal reaches a threshold amplitude and determining a maximum amplitude in a determined period of time after the CA signal reaches the threshold amplitude, and determine an RAs,p-RVs interval between the RAs,p event and RVs event. The one or more processors can also be configured to calculate an atrioventricular delay (AV) delay based on the RAs,p-RVs interval, and manage therapy, provided by the IMD, based on the AV delay that is calculated.

A cardiac pacemaker which stays synchronized with the heart's natural cycle even if atrial sensing events are intermittently sensed and intrinsic AV conduction occurs intermittently. The pacemaker includes a processing unit, a data memory, a detector and a pacing signal generator, wherein the processing unit, the data memory, the detector and the pacing signal generator are electrically interconnected, wherein the data memory is configured to store a pre-defined programmed AV delay, wherein the detector is configured to detect an intrinsic atrial activity signal and to detect an intrinsic ventricular activity signal, wherein the processing unit is configured to produce a ventricular pace control signal and to transmit it to the pacing signal generator. A respective operation method is also disclosed.

A system and method for monitoring and treating a patient with heart failure is discussed. The system may receive atrioventricular (AV) conduction characteristics at different heart rates or different patient conditions. Stimulation parameters, including stimulation timing parameters, may be stored in a memory. The system may include stimulation control circuitry configured to use the patient's AV conduction characteristics to determine a parameter update schedule indicating timings at which stimulation parameters are to be updated, and to dynamically update at least a portion of a stored set of stimulation parameters in the determined parameter update schedule. Stimulation parameters may be selected from the set of stimulation parameters for use during cardiac stimulation for a specified heart rate or heart rate range.

A method for controlling an adaptive pacing therapy that includes utilizing one or more processors to perform measuring an atrial-ventricular (AV) interval corresponding to an interval between an atrial paced (Ap) event or an atrial sensed (As) event and a sensed ventricular (Vs) event, setting an AV delay based on the AV interval, and measuring an S1 heart sound characteristic of interest (COI) while utilizing the AV delay in connection with delivering a pacing therapy by the IMD. The one or more processors also perform adjusting the AV delay, repeating the measuring, and adjusting to obtain a collection of S1 heart sound COIs and corresponding AV delays, selecting one of the AV delays, that corresponds to a select one of the S1 heart sound COIs, as a resultant AV delay, and managing the pacing therapy, utilized by the IMD, based on the resultant AV delay.