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

We thank the UMBRELLA study (NCT01561144 at clinicaltrials.gov) and the scientific cooperation platform for providing a valuable source of data to independent investigators in Spain. The CNIC is supported by the Ministerio de Ciencia, Innovacion y Universidades (MCNU) and the Pro CNIC Foundation, and is a Severo Ochoa Center of Excellence (SEV-2015-0505).