The Physiologic Pacing Registry is a prospective, observational, multi-center registry performed to gain a broader understanding of 1) physiologic pacing implant and follow-up workflows, including pacing and sensing measurements and 2) the clinical utility in creating a 3-dimensional electro-anatomical map of cardiac structures prior to physiologic pacing device implants based on the clinical site's routine care.

The Physiologic Pacing Registry will be conducted to gain a deeper understanding of physiologic pacing device implants and follow-up workflows, including device and programmer measurements to help inform Abbott's product and clinical data development efforts. Additionally, the registry will provide a broader understanding of the clinical utility in mapping physiologic pacing structures with the use of Abbott's EnSite Cardiac Mapping System with an electrophysiology catheter prior to device implants for those institutions where mapping is routine care prior to physiologic pacing device implant.

The registry will include patients undergoing implantation of an Abbott pacemaker, defibrillator, or a cardiac resynchronization therapy (CRT) pacemaker (CRT-P) or CRT defibrillator (CRT-D) according to the clinical site's routine care. Only patients scheduled to receive an Abbott device may be enrolled to ensure proper device data collection for future software and other physiologic pacing product development. The decision to provide physiologic pacing therapy and selection of devices for implant are at the discretion of the implanting physician. Abbott will collect data on the use of all commercially available leads and associated implant tools based on the physician's discretion as part of routine clinical practice within the registry.

Inclusion Criteria:

1. Scheduled for implantation of an Abbott pacemaker, defibrillator, or CRT-P/D device with any commercially available pacing lead as part of a physiologic pacing procedure according to the clinical site's routine care.
2. At least 18 years of age.
3. Willing and able to comply with the prescribed follow-up tests and schedule of evaluations.
4. Provided written informed consent prior to any registry-related procedures.

Exclusion Criteria:

1. History of tricuspid valve repair or replacement.
2. Currently participating in another clinical study with an active treatment arm and belong to the active arm
3. Presence of other anatomic or comorbid conditions, or other medical, social, or psychological conditions that, in the investigator's opinion, could limit the subject's ability to participate in the registry or to comply with follow-up requirements, or impact the scientific soundness of the registry results.
4. Chronic physiologic pacing lead implanted
5. Life expectancy of < 6 months.
6. Known contraindication for physiologic pacing therapy/implant (i.e. ongoing infection, known occlusion of the subclavian vein, etc.).

The registry will include patients undergoing implantation of a pacemaker, defibrillator, or a cardiac resynchronization therapy (CRT) pacemaker (CRT-P) or CRT defibrillator (CRT-D) according to the clinical site's routine care.