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.
As an example, with the oscilloscope trigger set to the rising edge and the level set to the 50 % point, the following figures illustrate the cause of an unstable waveform display. After two successive updates based on triggers 1 and 2, the resultant trace will appear unstable.