Acute Defibrillation Study

Inclusion Criteria:

• Subject must be undergoing surgical procedure for approved indications for
• cardiothoracic surgery where a midline sternotomy is planned, or
• implant of a transvenous (TV) ICD or subcutaneous ICD (S-ICD®), or
• VT ablation procedure, or
• VT inducibility testing during Electrophysiology (EP) study
• Subject must be willing to provide Informed Consent
• Subject must be ≥ 18 years old

Exclusion Criteria:

• Subject is considered to be at high risk for infection
• Subject has Left Ventricular Ejection Fraction (LVEF) ≤ 20%
• Subject at high risk of stroke
• Subject with an implanted active cardiac or non-cardiac device during study procedure (e.g., ICD, S-ICD®, Pacemaker, Neuro stimulator)
• Subject is pacemaker dependent
• Subject had previous pericarditis or prior sternotomy
• Subject has hiatus hernia or moderate or worse pectus excavatum
• Subject has hypertrophic cardiomyopathy
• Subject has severe aortic stenosis
• Subject has severe proximal three vessel coronary disease (over 70% in each vessel)
• Subject has >50% left main stem (LMS) disease
• Subject has known skin irritations to the Physio Control Fast Patch ECG Electrode
• Subject is enrolled in a concurrent study that may confound the results of this study, without documented pre-approval from a Medtronic study manager
• Subject has medical conditions that would limit study participation
• Subject is pregnant
• Subject meets exclusion criteria required by local law (e.g. age, breast feeding, etc.)