New insights on acute expansion and longitudinal elongation of bioresorbable vascular scaffolds in vivo and at bench test: A note of caution on reliance to compliance charts and nominal length

Objectives We performed systematic optical coherence tomography (OCT) analyses after bioresorbable vascular scaffolds (BVS) implantation in a “real world” setting aiming at evaluating scaffold expansion and longitudinal integrity. Background a comprehensive elucidation of BVS acute performance in the “real‐world” setting is lacking. Methods acute BVS expansion compared with compliance chart information and longitudinal integrity were assessed in 29 patients (32 lesions) by OCT. In addition, bench experiments with four scaffolds were performed with different combinations of deployment pressures and tube stiffness. Results scaffold underexpansion, using compliance chart information as reference, was observed in 97% of OCT cross‐sections in vivo; however, only 8.3% of the cross‐section analyzed revealed BVS area