Ventricular fibrillation undersensing to calculate a safety threshold for baseline rhythm R-wave amplitudes

Filgueiras-Rama et al comments on the study by Mark L. Brown on ventricular fibrillation (VF) sensing using Medtronic implantable cardioverter defibrillators (ICDs). Brown describes the ventricular sensing process performed on Medtronic ICDs, but unfortunately his report does not show further data processed with proprietary filters. Brown does criticize the recent report of Filgueiras-Rama et al in which they documented that baseline rhythm (BR) R-wave amplitudes