Abstract
CRT-D devices offer survival benefit in select NYHA class II-IV systolic heart failure patients with QRS >120ms and LVEF <35%. A limitation of 100% CRT pacing is excess battery drain, and earlier pulse generator (PG) replacement for CRT systems. CRT-D pulse generator change is associated with significant infection risk, morbidity, and cost. Ampere-hour or Ah measures residual PG battery capacity and may predict device longevity.
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