Single Chamber Atrial Leadless Pacing for Isolated Sinus Node Dysfunction

Inclusion Criteria:

1. Symptomatic sinus bradycardia
2. Sino-atrial exit block
3. Symptomatic sinus arrest with sinus pauses \> 2 sec during waking hours
4. Symptomatic sinus bradycardia \< 40 bpm for \> 1 min during waking hours
5. PR interval ≤ 0.22 sec if aged \< 70 years or PR interval ≤ 0.26 sec if aged ≥ 70 years
6. QRS width ≤ 0.12 sec
7. No prior PM implantation
8. Patients willing to receive an Assert-IQ loop recorder for research purposes

Exclusion Criteria:

1. Atrioventricular block
2. Bundle branch block
3. History of atrial fibrillation
4. Carotid sinus hypersensitivity
5. Planned cardiac surgery
6. Estimated life expectancy \< 1 year
7. Presence of an existing ventricular pacemaker or implantable cardioverter defibrillator
8. Known acute deep vein thrombosis of either lower extremity
9. Unable to read or write
10. Patient with Limited English Proficiency (LEP)
11. Cognitively impaired individuals
12. Pregnant