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Technical
IVT
lead impedance
The electrical resistance measured across a pacing or defibrillation lead, indicating lead integrity and tissue contact.
Full Definition
Lead impedance is a critical measurement that reflects the electrical resistance between the tip of a cardiac device lead and the pulse generator. Normal impedance values typically range from 300-1500 ohms for pacing leads and 25-100 ohms for defibrillation leads. Sudden changes in impedance can indicate lead fracture, insulation breach, or poor tissue contact. Regular impedance monitoring is essential for device function assessment and early detection of lead-related complications.
Usage
Usage note: Include units (ohms) when reporting specific values.
In Context
- "Lead impedance measurements remained stable at 650 ohms throughout the six-month follow-up period." — Clinical study report
- "An impedance drop below 200 ohms suggests possible insulation breach requiring immediate evaluation." — Device troubleshooting guide
Also known as
lead resistance
Don't confuse with
capture threshold
sensing threshold