The HBP Synchrony Using ECG Belt study is a prospective, non-randomized single site physician-initiated research study. The study will collect ECG Belt data from up to 30 subjects at one single center. The target population will include subjects with a currently implanted Medtronic cardiac implantable device who have a HIS placed lead. The purpose of the study is to characterize the electrical dispersion using the ECG Belt provided by Medtronic in patients who have a HIS placed lead and understanding the amount of synchrony with intrinsic conduction compared to HIS pacing.

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

The target population will include subjects with normal EF who have a Medtronic device and a HIS placed RV lead. In addition, we will include subjects who have intact AV conduction.