Patient survival and instrument performance with permanent cardiac pacing

Area of Science:

• Cardiology
• Biomedical Engineering
• Medical Device Technology

Background:

• Cardiac pacemakers have evolved significantly since their inception.
• Early pacemaker technology faced challenges with pulse generator and electrode reliability.
• Patient selection criteria for pacemaker implantation have also changed over time.

Purpose of the Study:

• To evaluate the long-term performance and patient outcomes of cardiac pacemakers implanted between 1961 and 1973.
• To assess trends in pulse generator failures and electrode malfunctions.
• To identify factors influencing survival rates in pacemaker recipients.

Main Methods:

• Retrospective analysis of 313 patients who received cardiac pacemakers.
• Tracking of patient survival rates over a five-year period.
• Monitoring of premature pulse generator failures and electrode malfunction incidence.

Main Results:

• A five-year survival rate of 65% was observed among the patient cohort.
• A significant decrease in premature pulse generator failures was documented, from 0.8 to 0.06 per 100 pacing months.
• Electrode malfunction incidence remained low and stable (0.5-0.8 per 100 months), affecting both epicardial and endocardial systems.

Conclusions:

• Cardiac pacemaker technology demonstrated improved reliability over the study period, with a notable reduction in premature pulse generator failures.
• While electrode malfunctions were infrequent, they may impact the effectiveness of surveillance systems relying on pacing parameters.
• Changes in patient selection, favoring older individuals with comorbidities, likely contributed to observed survival rate variations.