To replace or not to replace: a systematic approach to respond to device advisories

Area of Science:

• Cardiology
• Medical Device Engineering
• Patient Safety

Background:

• Advisory letters for medical devices necessitate decisions on replacement.
• Device replacement involves inherent risks and patient-specific clinical factors.

Purpose of the Study:

• To develop a quantitative method for assessing the risk-benefit ratio of medical device replacement.
• To aid clinicians and patients in making informed decisions regarding device replacement following advisory notices.

Main Methods:

• Developed a "number needed to replace" (NNR) equation.
• Incorporated four key parameters: sudden cardiac death rate, residual device life, device failure rate difference, and replacement procedure mortality risk.

Main Results:

• Patients with high arrhythmic risk (>=25% annually) and high-risk devices (>=1% failure rate) have an NNR < 250.
• Pacemaker-dependent patients with devices >=3 years old and >=0.5% failure rate have an NNR < 100.
• Patients with low arrhythmic risk (<=2.5% annually) or low device failure rates (<0.1%) have a high NNR, indicating potential harm from replacement.

Conclusions:

• The NNR equation provides a quantifiable benefit/risk ratio for device replacement decisions.
• Pacemaker-dependent patients and those with high arrhythmic risk may benefit from replacing high-failure-rate devices.
• Patients with low arrhythmic risk or low device failure rates may face more harm than benefit from replacement.