5032Evaluation of the EAPCI OCT criteria for optimization of angioplasty in the DOCTORS study population
Authors: Guillon B , Moris M , Besutti M , Lefrancois Y , Amabile N , Combaret N , Ohlmann P , Belle L , Silvain J , Schiele F , Meneveau N 
Published: October 2019

Abstract

Background
The recent expert consensus of the EAPCI suggested OCT criteria for the optimization of PCT after stent implantation. Using the data from the randomized, controlled DOCTORS study, we aimed to analyze the proportion of OCT criteria that were met immediately after stent implantation, and to evaluate the changes made to the revascularization strategy in order to optimize the procedure.

Methods
The DOCTORS study population consisted of patients admitted for non ST elevation myocardial infarction (NSTEMI) and presenting an indication for PCI with stent implantation of the target lesion. In the 120 patients randomized to the OCT-guided group, OCT was performed after initial coronary angiography and repeated immediately after stent implantation. The operator was required to evaluate quantitative measures of the reference diameter and reference area of the vessel and the length of the lesion based on the OCT images acquired before PCI. All OCT images were analyzed in a centralized core laboratory by 2 independent operators blinded to the angiographic findings. Post-PCI optimization targets to be achieved following stent implantation included optimal stent expansion (minimal stent area (MSA)/average reference lumen >80%), avoidance of landing zone in plaque burden >50% or lipid rich tissue; avoidance of large malapposition regions (axial distance <0.4 mm and <1 mm length), no extensive irregular tissue protrusion, and limited dissections (<60°, flap limited to intima, <2 mm length).

Results
Among the 120 patients who had an OCT run performed immediately after stent implantation, 50 patients (42%) had stent under-expansion, 59 (49%) had landing zone in plaque burden >50% or lipid rich tissue, 27 (22.5%) had stent malapposition, 25 (20.8%) had extensive irregular tissue protrusion and 45 (37.5%) had extensive edge dissection. Only 2 patients (1.7%) fullfiled all criteria of post-PCI optimization immediately after stent implantation, while no criterion was reached in 15 patients (12.5%). Post-stent overdilation was performed in all patients with stent underexpansion, and in 22/27 patients (81.5%) with stent malapposition. Additional stent implantation was performed in 32 patients (24 for landing zone in plaque burden >50% and 8 for extensive adventitial edge dissection). Overall, the use of OCT led the operator to optimize the procedural strategy in 60 patients (50%).

Conclusion
The proportion of suboptimal results as evaluated by OCT and based on the EAPCI criteria immediately after stent implantation was very high in the DOCTORS study, even though the choice of stent in these patients was based on pre-PCI OCT data. The post-PCI OCT findings led to a change of strategy to optimize the procedure in 50% of patients. It remains to be determined through a larger prospective study whether this optimization of PCI strategy is associated with a clinical benefit in the long term.