Use of Physiology to Evaluate Procedural Result After PCI CTO

ULTRA-CTO is a prospective multicentre non-randomised investigator-initiated trial designed to enrol 200 subjects with an indication for percutaneous coronary intervention (PCI) of chronic total occluded (CTO) coronary artery. The main objective of the study is to assess the predictive value of post-PCI resting full-cycle ratio (RFR) and fractional flow reserve (FFR) with regard to Fractional flow reserve (SSR) in CTO patients.

ULTRA-CTO is a prospective multicentre non-randomised investigator-initiated trial designed to enrol 200 subjects with an indication for PCI CTO. The main objective of the study is to evaluate both the value of post-PCI RFR and post-PCI FFR for detecting suboptimal stent result (SSR). After angiographically successful CTO PCI, intra-coronary physiologic assessment (RFR, FFR, coronary flow reserve (CFR) and index of microcirculatory resistance (IMR)) of the CTO vessel will be performed. Additional OCT will be performed directly or during a staged procedure within 4 ± 2 weeks when indicated (i.e. high contrast use, procedural duration, major dissection or other safety reasons according to the operator). When intra-coronary physiologic assessment or OCT is not possible at all, the patients will not be included in the study. When the operator decides to optimize the stent result (post-dilation or additional stenting), based on the OCT and/or physiology, post-PCI RFR and FFR should be repeated. For patients undergoing a clinically indicated FFR of a remaining intermediate stenosis (angiographically 30-90%) in a non-CTO vessel or major side branch of the CTO vessel within 4 weeks after the index procedure, intra-coronary physiologic assessment (RFR, FFR, CFR and IMR) will be repeated in the CTO vessel for exploratory objectives At 4 ± 2 weeks follow-up, the occurrence of cardiovascular events and clinical classification will be assessed for secondary objectives