Chapter 3

Sensing

What the RV and LV channels sense, and what an LV sense does to CRT: noise, atrial far-field signals, the LV protection period, and the limits of LV sensing in a fast VT (LV refractory period).

The cases

1Extra LV sensed events in a CRT-D programmed VVI 40 2Intermittent RV-only paced beats in a RESONATE CRT-D 3LV-only pacing with oversensing on the LV and on the RV channel 4Intermittent loss of LV pacing despite 99% RV pacing 5CRT-D shock: and what about the LV channel?

From Boston Scientific CRT — clinical cases by M. Strik. Published by Cardiocases. Every numbered marker on a recording is explained in the list beneath it; tap a marker on the trace or an entry in the list.