Lead survivability will be summarized.

The purpose of this study is to evaluate long-term performance of the 4396 LV Lead. This evaluation is based on the number of lead-related complications occurring during the study compared to the number of leads enrolled in the study. The leads will be followed for 5 years after implant. This study is required by FDA as a condition of approval of the Model 4396 LV Lead. This study is conducted within Medtronic's post-market surveillance platform.

Patients who meet all of the following inclusion criteria and do not meet any of the following exclusion criteria are eligible for enrollment.

Inclusion Criteria

• Patient or legally authorized representative provides written authorization and/or consent per institution and geographical requirements
• Patient has or is intended to receive an Attain Ability Model 4396 LV lead
• Patient within 30 day post implant enrollment window

Exclusion Criteria

• Patient who is, or is expected to be inaccessible for follow-up
• Patient with exclusion criteria required by local law
• Patient is currently enrolled in or plans to enroll in any concurrent drug and/or device study that may confound results

Patients implanted with a 4396 LV Lead within 30 days. All subjects must meet Inclusion criteria and none of the Exclusion criteria.