Optimizing Pacemaker Settings to Reduce Fatigue
Pacing Mode and Fatigue Outcomes
- The American College of Cardiology recommends dual-chamber pacing (DDD/DDDR) over ventricular-only pacing (VVI mode) to improve quality of life and reduce fatigue, as VVI mode can worsen fatigue through pacemaker syndrome, which manifests as fatigue, chest discomfort, dyspnea, and other symptoms due to loss of AV synchrony 1, 2, 3.
- Pacemaker syndrome occurs in up to 83% of patients with VVI pacing who are in sinus rhythm, with 12 of 16 symptoms being significantly worse compared to dual-chamber pacing 1, 2.
- Dual-chamber pacing (DDD/DDDR) improves quality of life compared to ventricular pacing, with significant improvements in role physical, role emotional, and vitality subscales on the SF-36 instrument 1, 2, 3.
Clinical Algorithm for Minimizing Fatigue
- If in sinus rhythm, the American Heart Association suggests avoiding VVI pacing and using dual-chamber (DDD/DDDR) or atrial pacing (AAI/AAIR) to maintain AV synchrony 1, 4, 5.
- High risk indicators for pacemaker syndrome include intact VA conduction, need for maximum atrial contribution, and congestive heart failure, and if high risk, VVI mode should be contraindicated and dual-chamber pacing mandated 4, 6, 7.
Evidence on Quality of Life Outcomes
- The PASE trial demonstrated that dual-chamber pacing improved quality of life and cardiovascular functional status compared to ventricular pacing 1, 2.
- The MOST trial showed that dual-chamber pacing improved vitality scores (directly related to fatigue) on SF-36 assessment 1, 2, 3.
- The CTOPP trial found improved exercise capacity (6-minute walk distance) in dual-chamber pacing groups with high pacing burden 1, 2.