Definitions and endpoints
Baseline QTc was defined as the median QTc during the first hour post
CV. Conventional monitoring was defined as the Holter tracing at the
second hour following CV. Holter monitoring was defined as tracings
starting 3 hours following CV throughout the end of the monitoring
period. The primary endpoint was clinically significant QTc prolongation
defined as; 1) new prolongation of QTc ≥500 ms (if baseline QTc was
< 480 ms) or 2) prolongation of QTc ≥10% if baseline QTc was
>480 ms.