A post from March 15 on the A & S Research website simply states, âToday is a sad day to report the passing of Dr. Roger K. Leir, we have lost a great family man, podiatrist and devoted ufologist. He will be greatly missed by all.â.
On the ECG, failure to capture is identified by the presence of pacing spikes without associated myocardial depolarization. Causes include pacing lead problems, battery or component failure, low pacing voltage or elevated myocardial pacing thresholds, and exit block.
Failure to capture is when the pacemaker signal fires but there is no response. This is identified by having pacing spikes present with no resulting QRS, (capture). The example below shows the first two ventricular paced beats capture, then the next two spikes fire but there is no capture. The last beat captures. Pacemaker Failure to Sense. In most cases, sensing problems are less threatening and can be corrected by performing a pacemaker interrogation. Sensing problems include undersensing where the pacemaker fails to sense the native cardiac rhythm.