defibrillation threshold
The minimum energy required to successfully terminate ventricular fibrillation, typically tested during ICD implantation.
Full Definition
Defibrillation threshold (DFT) represents the minimum shock energy needed to reliably convert ventricular fibrillation back to normal rhythm. DFT testing during ICD implantation involves inducing ventricular fibrillation and delivering progressively lower energy shocks to determine the minimum effective energy. Most modern ICDs have maximum outputs of 35-40 joules, providing substantial safety margins above typical DFT values of 5-15 joules. Some centers have moved away from routine DFT testing due to improved lead technology and device reliability.
Usage
Usage note: Include energy units (joules) when reporting specific threshold values.
In Context
- "Defibrillation threshold testing confirmed successful termination of ventricular fibrillation at 15 joules." — Surgical procedure report
- "The defibrillation threshold remained stable at six-month follow-up with adequate safety margin." — Clinical follow-up note