Signal-processing enhancement to reduce oversensing of T waves without increasing undersensing of ventricular fibrillation in the subcutaneous implantable cardioverter-defibrillator

In this issue of HeartRhythm, Theuns et  al1 report that a modified high-pass filter reduces P- and T-wave oversensing (P/TWOS) by the subcutaneous implantable cardioverter-defibrillator (S-ICD). Historically, TWOS has been an issue with ICDs.2 Pacemakers reject baseline-rhythm T waves reliably by using fixed sensing thresholds near 2 mV and high-pass filters near 20 Hz. ICDs cannot use this solution because they must sense ventricular fibrillation (VF), which has low-amplitude and lower-frequency electrograms (EGMs) than do conducted rhythms.

Source: Heart Rhythm - June 5, 2018 Category: Cardiology Authors: Sandeep G. Nair, Charles D. Swerdlow Tags: Editorial Commentary Source Type: research