lead impedance drift
Gradual change in electrical resistance of a pacing lead over time, indicating potential lead integrity issues.
Full Definition
Lead impedance drift refers to the progressive change in electrical resistance measured across a pacing lead system over time, typically indicating developing problems with lead integrity such as insulation breaches, conductor fractures, or tissue interface changes. This parameter is monitored during routine device follow-up visits as sudden or significant drift patterns can predict lead failure before complete malfunction occurs. Medical editors must recognize that impedance drift patterns differ from acute impedance changes and require trend analysis rather than single-point measurements for clinical significance.
Usage
Usage note: Emphasize trend analysis over single measurements; specify direction of drift (increasing/decreasing) and timeframe.
In Context
- "Lead impedance drift over six months indicated developing insulation failure requiring lead replacement." — Device clinic note
- "Monitoring protocols include impedance drift analysis to identify leads at risk for failure." — Clinical practice guideline