Frequency of a large drift caused by pressure wire using optical fibers

The frequency of a large pressure signal drift (PDs) caused by pressure wire using optical fibers and its effect on fractional flow reserve (FFR)-based decision-making is not clear. We used pressure wires using optical fibers as "workhorse wires" for 95 consecutive lesions. The wire was normalized at the tip of the guiding catheter just before performing the percutaneous coronary intervention (PCI) and was used without re-normalization until the end of the PCI. The drift value at the end of the procedures was evaluated. Four per cent (n = 4) of patients showed a large drift (PD >3 mmHg). Classification discordance between read-out and PD-corrected FFR values was detected in 8 (8%) measurements in total. The decision changed from FFR ≤0.80 to >0.80 in 7 (7%) measurements and vice versa in 1 (1%) measurement. PD showed no effect on decision-making when the FFR read-out value was <0.78 or >0.82. The frequency of large drifts caused by pressure wires using optical fibers was 4%. However, no case showed decision changes when the FFR gray zone was considered.