Subject is currently dependent on ventricular pacing

Subject has Left Bundle Brunch Block (LBBB) and/or wide QRS

Subject has chronic Atrial Fibrillation (AF)

Subject has dementia

Subject is indicated for a single chamber device

Subject requires a right sided or abdominal ICD implant

Subject is pregnant or in fertile age without secure birth control

Subject has New York Heart Association (NYHA) class IV or refractory heart failure

Subject is not expected to survive greater than 12 months

Subject is participating in other confounding research studies

ST Segment Detection Study