17 results about "Ventricular pacing" patented technology

In some examples, controlling delivery of CRT includes controlling an implantable medical device to deliver ventricular pacing according to a sequence of different values of a CRT parameter and acquire first and second electrograms from respective first and second electrode vectors. For each value of the CRT parameter, a value of a comparison metric of a first activation interval between a first fiducial point of a cardiac cycle detected in the first electrogram and an occurrence of a second fiducial point of the cardiac cycle and a second activation interval between the first fiducial point and the occurrence of the second fiducial point detected in the second electrogram can be determined. A target value of the comparison metric can be identified and an updated value of the CRT parameter determined based on the target value. The system can then control the IMD to deliver ventricular pacing at the updated value of the CRT parameter.

In some examples, a system can be used for delivering cardiac resynchronization therapy (CRT). The system may include a pacing device configured to be implanted within a patient. The pacing device can include a plurality of electrodes, signal generation circuitry configured to deliver ventricular pacing via the plurality of electrodes, and a sensor configured to produce a signal that indicates mechanical activity of the heart. Processing circuitry can be configured to identify one or more features of a cardiac contraction within the signal, and determine whether the contraction was a fusion beat based on the one or more features.

A medical device is configured to deliver atrioventricular junction stimulation (AVNS) therapy for suppressing atrioventricular junction conduction by generating a pulse train in accordance with atrioventricular junction stimulation (AVNS) control parameters. The medical device may deliver ventricular pacing pulses and determine that a threshold number of ventricular pacing pulses are delivered while delivering the AVNS therapy. The medical device may adjust at least one AVNS control parameter in response to determining that the threshold number of ventricular pacing pulses has been delivered.

Dual chamber leadless pacemaker systems comprising an aLP and a vLP, and methods for use therewith, are disclosed. Such systems and methods can detect and terminate pacemaker mediated tachycardia (PMT) even when the implant-to-implant (i2i) communication from the vLP to aLP (V2A) is compromised. The vLP monitors for PMT in response to reception of an i2i communication from the aLP indicating compromised V2A i2i communication and initiates, following detection of a PMT, initiate a PMT PV interval in response to reception of an i2i communication from the aLP indicating an atrial sensed event. The PMT PV interval is shorter than a PV interval that the vLP would otherwise use for ventricular pacing if PMT was not detected. The vLP also delivers a ventricular pacing pulse to the ventricular cardiac chamber in response to the PMT PV interval expiring without an intrinsic ventricular event being detected during the PMT PV interval.

A medical device having a motion sensor is configured to sense a motion signal, generate ventricular pacing pulses in a non-atrial tracking ventricular pacing mode and detect atrial event signals from the motion signal during the non-atrial tracking ventricular pacing mode. The medical device may be configured to determine atrial event intervals from the detected atrial event signals, determine a frequency distribution of the determined atrial event intervals and determine an atrial rate based on the frequency distribution of the detected atrial event intervals.

An implantable medical device system includes an extracardiac sensing device and an intracardiac pacemaker. The sensing device senses a P-wave attendant to an atrial depolarization of the heart via housing-based electrodes carried by the sensing device when the sensing device is implanted outside the cardiovascular system and sends a trigger signal to the intracardiac pacemaker in response to sensing the P-wave. The intracardiac pacemaker detects the trigger signal and schedules a ventricular pacing pulse in response to the detected trigger signal.

The present disclosure pertains to cardiac pacing methods and systems, and, more particularly, to cardiac resynchronization therapy (CRT). In particular, the present disclosure pertains to determining whether a patient is experiencing atrial fibrillation (AF). If the patient is experiencing AF, the efficacy of CRT is determined. A signal is sensed in response to a ventricular pacing stimulus. Through signal processing, a number of features are parsed from the signal and a determination is made as to whether the ventricular pacing stimulus evoked a response from the ventricle.

A medical device is configured to sense at least one cardiac electrical signal and generate pacing pulses according to a first pacing therapy by generating pacing pulses for delivery to a first combination of ventricular pacing sites including at least one ventricular conduction system pacing site. The medical device may be configured to determine a ventricular conduction condition based on a QRS signal feature of the sensed cardiac signal during the first pacing therapy. The medical device may change to a second pacing therapy different than the first pacing therapy based on the determined ventricular conduction condition.

A method of operating a cardiac rhythm management (CRM) system includes: measuring a baseline PR interval of cardiac depolarization; measuring one or both of the heart sound and the heart depolarized QRS width; delivering pacing stimulation according to atrial sensing of a ventricular pacing interval (AsVp interval), and measuring one or both of a heart sound and a QRS width of the AsVp interval, where the pacing stimulation is delivered using a conducted system pacing (CSP) vector comprising electrodes positioned in the interventricular septum; delivering a pacing stimulus according to an atrial pacing to ventricular pacing interval (ApVp interval) and measuring one or both of a heart sound and a QRS width of the ApVp interval; and generating a recommended atrial-to-ventricular delay setting for the CSP based on one or both of the measured heart sound and the QRS width.

An intracardiac ventricular pacemaker includes a pulse generator for delivering ventricular pacing pulses, an impedance sensing circuit, and a control circuit in communication with the pulse generator and the impedance sensing circuit. The pacemaker is configured to produce an intraventricular impedance signal, detect an atrial systolic event using the intraventricular impedance signal, set an atrioventricular pacing interval in response to detecting the atrial systolic event, and deliver a ventricular pacing pulse in response to the atrioventricular pacing interval expiring.

Systems are provided for detecting potential pacemaker lack of capture in surface electrocardiogram (ECG) signals. In one example, a system includes a plurality of electrodes configured to measure electrical potential generated at a skin of a patient, an electrode monitor configured to generate an ECG signal from the electric potential, an interface, a memory storing instructions, and at least one processor configured to execute the instructions to: obtain a baseline ECG signal of the patient, obtain a current ECG signal of the patient from the electrode monitor, determine, based on the baseline ECG signal and / or the current ECG signal, that the patient has an electronic implant carrying out biventricular pacing, compare, based on the determination, the baseline ECG signal to the current ECG signal of the patient, and indicate, through the interface, a degradation condition of the electronic implant based on the comparing and the determination.

This invention provides a vagus nerve stimulation device and a stimulation parameter optimization method. The device includes a programmer and a pulse generator. The pulse generator is wirelessly connected to the programmer and is used to convert programming commands sent by the programmer into a rapid pacing pulse sequence or a vagus nerve stimulation pulse sequence. The pulse generator is connected to a vagus nerve stimulation electrode, a right ventricular photoplethysmography (PVP) composite electrode, and a right ventricular pacing electrode via electrode interfaces. The vagus nerve stimulation electrode generates a first electrical stimulation based on the vagus nerve stimulation pulse sequence. The right ventricular PVP composite electrode acquires PVP data at a set location. The right ventricular pacing electrode generates a second electrical stimulation based on the rapid pacing pulse sequence and acquires intracardiac electrocardiogram (ICG) data during the first electrical stimulation. The pulse generator obtains cardiovascular physiological parameter data based on the PVP data and heart rate detection data based on the ICG data, and transmits the data wirelessly to the programmer.

A medical device includes a motion sensor to generate a motion signal including a cardiac event signal. The medical device generates a ventricular pacing pulse upon expiration of a pacing interval. The medical device determines a measure of synchrony from the motion signal following delivery of the ventricular pacing pulse, and adjusts the pacing interval based on the measure of synchrony.

Leadless pacemakers (LPs) and methods and systems for use therewith are disclosed that are specifically for use with a multi (e.g., dual) chamber LP system that performs AAI+VVI operation. More specifically, an atrial LP (aLP) and a ventricular LP (vLP) collectively provide the AAI+VVI operation. Additionally, at least one of the aLP or the vLP determines a compensation offset and uses the compensation offset to compensate for drift between timing circuitry of the atrial LP and timing circuitry of the vLP while the aLP and the vLP are providing for AAI+VVI operation, so that synchronization between atrial and ventricular pacing is maintained whenever the vLP delivers ventricular pacing during two or more consecutive cardiac cycles during the AAI+VVI operation.

An intracardiac ventricular pacemaker is configured to operate in in a selected one of an atrial-tracking ventricular pacing mode and a non-atrial tracking ventricular pacing mode. A control circuit of the pacemaker determines at least one motion signal metric from the motion signal, compares the at least one motion signal metric to pacing mode switching criteria, and, responsive to the pacing mode switching criteria being satisfied, switches from the selected one of the non-atrial tracking pacing mode and the atrial tracking pacing mode to the other one of the non-atrial tracking pacing mode and the atrial tracking pacing mode for controlling ventricular pacing pulses delivered by the pacemaker.

A medical device system includes a medical device configured to deliver ventricular pacing to a heart of a patient. The medical device system also includes processing circuitry configured to receive electrocardiogram data of the patient sensed by the medical device during delivery of the ventricular pacing. The processing circuitry is further configured to identify one or more heartbeats within the electrocardiogram data. The processing circuitry is further configured to determine one or more patient parameters based on the one or more heartbeats. The processing circuitry is further configured to control the medical device to deliver cathodic pacing or anodal-cathodic pacing based on the one or more patient parameters.

A medical device system delivers ventricular pacing pulses as conduction system pacing (CSP) pulses in at least one example. The medical device system senses at least one cardiac electrical signal and obtains at least one post-pace T-wave from the at least one cardiac electrical signal sensed following a delivered CSP pulse. The medical device system may determine at least one T-wave match metric between the at least one post-pace T-wave and at least one T-wave template and determine that effective CSP criteria corresponding to capture of at least a portion of a cardiac conduction system are not met based on the at least one T-wave match metric.