Permanent pacemaker selection and subsequent survival in elderly Medicare pacemaker recipients

Area of Science:

• Cardiology
• Medical Device Technology
• Health Services Research

Background:

• Dual-chamber pacemakers offer physiological advantages but are more expensive and have shorter service lives than single-chamber devices.
• Understanding patient subgroup selection for dual-chamber devices is crucial for optimizing cardiac pacing therapy.
• Variations in pacemaker selection practices may not always align with clinical indications.

Purpose of the Study:

• To identify patient subgroups preferentially receiving dual-chamber pacemakers.
• To determine if pacemaker type selection impacts patient mortality.
• To analyze factors influencing the choice between dual-chamber and single-chamber ventricular pacemakers.

Main Methods:

• Analysis of a 20% national sample of Medicare beneficiaries aged 65+ undergoing initial pacemaker placement (1988-1990).
• Logistic regression to identify correlates of dual-chamber pacemaker selection.
• Cox proportional hazards model to assess the association between pacemaker type and mortality.

Main Results:

• Dual-chamber pacemaker use increased from 27.2% to 37.0% between 1988 and 1990.
• Younger patients, males, and those with atrioventricular block or congestive heart failure were more likely to receive dual-chamber devices.
• Factors such as Medicaid eligibility, rural implantation, and hospital characteristics also influenced pacemaker selection, independent of clinical factors.
• Dual-chamber pacemaker selection was an independent predictor of improved survival at 1 and 2 years.

Conclusions:

• Significant variations exist in cardiac pacing practices, with many selections not driven by clinical characteristics.
• The choice of a dual-chamber pacemaker is associated with enhanced patient survival.
• Prospective, outcome-based clinical trials are needed to guide pacemaker mode selection.