Ventricular Tachyarrhythmia

The objective of this study is to assess the safety and performance of the SPIKE FLOW endocardial lead. Primary objectives are to assess: * safety in terms of freedom from Serious Adverse Events(SADEs); * performance in terms of Mean Pacing Capture Threshold. Secondary objectives are to assess: * safety in terms of freedom from Adverse Events (ADEs); * performance in terms of Mean Pacing Impedance; * performance in terms of Sensed R-wave Amplitude. The study is a prospective, non-randomized, single-arm, multi-center investigation in 131 adult subjects with 3 investigational sites in Italy. The study is expected to take approximately 1 year to enroll. Enrolled subjects will have visit timepoints at: baseline, lead insertion, lead removal, discharge and 30 days post lead removal.