Biventricular pacing, which included multiple interventricular delays, was also conducted in a subset of 10 patients. Results: When paced LV‐only, peak CRI was similar (93 ± 5% vs. 92 ± 5%) during atrial sensing or pacing but optimal PAVD was 61 ± 31 ms greater than optimal SAVD. ...
1-A) while chest x-ray showed normal lead positions in right arial appendage and right ventricular apex. The sensed and paced AV delay was 170 msec and 200 msec respectively, with a lower tracking rate (LTR) of 60/min and the upper tracking rate (UTR) of 130/min. Routine device ...
Patient characteristics generally needed for pseudo-RNRVAS are: 1) (partially) competent sinoatrial node; and 2) atrioventricular (AV) conduction delay or block (physiological AV conduction leading to a ventricular sensed event prevents pseudo-RNRVAS). Programming features promoting pseudo-RNRVAS are:...
and is activated when the sensed ventricular activity indicates a probability of atrial fibrillation to conserve a depletable power source. An endocardial lead is also described which ensures that the delivered atrial defibrillating electrical energy is substantially confined to the atria of the heart...
Sensing atrial events occurring at a high rate is complicated due to post ventricular blanking periods that are implemented by the device following ventricular sensed or paced events. If atrial events fall within the post ventricular blanking periods, they may not be sensed or counted toward ...
In other words, the dual chamber pacemaker knows when both sensed and paced events have occurred in both atrial and ventricular sensing and pacing channels since all sensing and pacing control is happening in the one device, i.e., the dual chamber pacemaker. Intracardiac pacemakers have been ...
This form of upper rate behavior eliminated the longer cycle (containing the unsensed P wave) that occurs at the end of the pacemaker Wenckebach sequence during traditional DDD pacing with ventricular-based lower rate timing.CAREY S. FREDMAN...
In certain embodiments, the aLP senses a signal from which cardiac activity associated with a ventricular chamber can be detected by the aLP itself based on feature(s) of the sensed signal. The aLP monitors the sensed signal for an intrinsic or paced ventricular activation within a ventricular ...
The methods and devices are configured to: i) during a first cardiac beat; following a ventricular paced (VP) or ventricular sensed (VS) event, activate a timer for a post ventricular-atrial refractory period (PVARP) interval; and determine whether a first atrial refractory (AR) event occurs...
RESULTS. In this context, the events marked as atrial sensed (As) or paced (Ap) are indeed ventricular, so that sensing is more complex. A clinical scenario is atrial activity oversensed on the His channel (As) leading to RV dyssynchronous pacing in the ventricular safety pacing (VSP) ...