Inclusion Criteria:  Patient has previously been implanted with a Medtronic IPG/ICD and a HIS placed RV lead Patient has intrinsic AV conduction Normal EF, defined as EF >50%, as shown on recent echo within last 12 months Patient is willing and able to comply with the protocol Patient is 18 years of age or older  Exclusion Criteria:  ●Patient is ventricular pacer dependent