insulation failure
Breakdown of the outer coating of a cardiac lead, causing electrical leakage and circuit malfunction.
Full Definition
Insulation failure occurs when the protective outer coating of a cardiac lead deteriorates or breaks down, creating unwanted electrical pathways that can cause current leakage, short circuits, or electrical noise. This failure can result from material degradation, mechanical stress, crushing, or manufacturing defects. Insulation failures typically manifest as decreased impedance, current drain, oversensing, or loss of capture. Certain lead models have experienced higher rates of insulation failure, leading to recalls and special monitoring protocols. Early detection through regular device interrogation and impedance monitoring is crucial for patient safety.
Usage
Usage note: Distinguish from 'lead fracture' which involves conductor wire breakage rather than insulation breakdown.
In Context
- "The low impedance reading suggested possible insulation failure requiring lead replacement." — Device troubleshooting report
- "Insulation failure of the recalled lead model necessitated prophylactic replacement." — Advisory communication