The maximum left ventricular outflow tract velocity time integral was 15.8 cm with sensed AV delay (40 ms) and 15.0 cm with paced AV delay (220 ms); however, this exceeded the pacemaker''s maximum difference of 100 ms. We herein report the case of a large discrepancy in optimal AV ...
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 ...
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:...
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...
S. Serge Barold 195Accesses Abstract Ausubel and Furman defined the pacemaker syndrome as a clinical complex of “signs and symptoms related to the adverse hemodynamic and electrophy-siologic consequences of ventricular pacing” [1] in the presence of a normally functioning implanted ventricular pacem...
Following paced ventricular events 102 are blanking intervals 104A–104J (“104”) in which the sensitivity of detectors that detect atrial events 100 may be decreased, e.g., to avoid saturation. During a blanking interval 104, implanted medical device 10 may fail to sense (“undersense”) ...
Background: Right ventricular (RV) apical pacing may result in ventricular dyssynchrony, which is associated with functional and morphological changes in the left ventricle (LV) Our aim is to assess contraction and hypertrophy-related protein expression changes in the LV after RV apical pacing ...
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...
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 ...
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) ...