Abstract
Background: A CRT-D device (Insync Sentry – Medtronic) monitors thoracic fluid accumulation via intrathoracic impedance (Z). The programmable fluid index (FI) is determined by the cumulative consecutive negative deviations in the daily Z from the calculated adaptive reference line. Increased FI is detected by a programmed threshold. Declining intrathoracic Z and FI threshold crossings have been associated with heart failure (HF) decompensation. However, the impact of surgical revisions of the device or lead on the clinical utility of the derived index has not been evaluated.
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