A new algorithm for optimization of rate-adaptive pacing improves exercise tolerance in patients with HFpEF

Area of Science:

• Cardiology
• Biomedical Engineering
• Exercise Physiology

Background:

• Heart failure with preserved ejection fraction (HFpEF) patients with permanent atrial fibrillation (AF) and VVIR pacing often experience exercise intolerance.
• Conventional pacemaker programming may not adequately address the complex physiological needs of these patients during exertion.

Purpose of the Study:

• To develop and evaluate an algorithm for optimizing rate-adaptive pacing settings in HFpEF patients.
• To improve exercise capacity and quality of life in patients with permanent AF and VVIR pacing.

Main Methods:

• A prospective randomized controlled study involving 54 HFpEF patients with permanent AF and VVIR pacing.
• Intervention group: optimization of rate-adaptation parameters using cardiopulmonary exercise testing (CPET) and pacemaker stress echocardiography (PASE).
• Control group: conventional pacemaker programming. Assessments included CPET, 6-min walk test, echocardiography, DASI, and MLHFQ at baseline and 3 months.

Main Results:

• The intervention group showed significant improvements in VO2 peak, anaerobic threshold, exercise time, and 6-min walk test distance.
• Significant improvements were also observed in Duke Activity Status Index (DASI), Minnesota Living with Heart Failure Questionnaire (MLHFQ) scores, and echocardiographic parameters (LA volume, E/e', SPAP).
• These improvements were statistically significant compared to the control group.

Conclusions:

• An algorithm integrating CPET and PASE offers an effective method for optimizing rate-adaptation parameters in VVIR pacemakers.
• This optimized programming significantly enhances exercise capacity and quality of life for HFpEF patients with permanent AF.
• The developed algorithm is a valuable tool for managing exercise intolerance in this patient population.