iFR - Method and system for computation of start time of wave-free period for calculation of iFR for determination of treatment of intermediate coronary artery stenosis

摘要

The calculation system at the start of the wave-free section for iFR calculation is a pressure sensor that is inserted into the coronary artery and detects the blood pressure of the proximal and distal portions located before and after the stenosis, respectively, and outputs a corresponding signal. It includes an iFR processing unit that performs iFR calculation by processing and calculating a signal. The iFR processing unit calculates a pressure difference between the proximal blood pressure Pa and the distal blood pressure Pd, differentiating the calculated pressure difference, squaring the differential value, and the squared value Comprising the step of integrating (square integral), and when the cumulative integral value reaches a preset threshold, determining a corresponding time point as a start point of a wave-free section for calculating iFR. do.