Force-Time Integral
Also written as: FTI — Force-Time Integral
A measurement combining catheter contact force and application duration during ablation. Predictive parameter for lesion size and transmurality.
Full Definition
Force-time integral (FTI) is a quantitative measure that combines catheter contact force with the duration of force application during radiofrequency ablation to predict lesion characteristics. Measured in gram-seconds (g·s), FTI integrates the contact force curve over time to provide a comprehensive assessment of mechanical energy transfer to tissue. Studies have demonstrated that FTI correlates with lesion depth, width, and transmurality more accurately than force or time alone. Target FTI values vary by anatomical location and clinical indication, with typical targets ranging from 300-600 g·s for different applications. Modern contact force sensing catheters provide real-time FTI calculations to guide optimal ablation parameters and improve procedural outcomes.
Usage
Usage note: Advanced parameter requiring contact force sensing technology. Increasingly used to standardize ablation.
In Context
- "Target force-time integral of 400 g·s was achieved for each pulmonary vein ablation point." — procedure protocol
- "The FTI display guided the operator to achieve consistent lesion parameters." — technical documentation