Experimental: Intermediate lesion OCT-based management

At OCT analysis, lesion features prompting intervention instead of conservative approach will be the following:~1. FCT \<75 µm, plus at least 2 of 3 other OCT criteria of plaque vulnerability (i.e., MLA \<3.5 mm2, lipid arc with circumferential extension \>180°, and the presence of macrophages).~2. The presence of intracoronary thrombus at a non-culprit site, irrespective of the presence of other vulnerability criteria, may prompt treatment with DES, at the operator's discretion.~All lesions fulfilling these interventional criteria will be treated with an OCT guided DES implantation in order to achieve an optimal stent implantation.~In presence of a MLA \<2.0 mm2, best cut-off showing correlation with fractional-flow reserve positive functional (FFR) assessment, clinical decision whether to treat the lesion will be based on FFR assessment irrespective of the presence of other criteria of vulnerability. Alternatively authors will have the option to treat the lesion with a DES.

Active_comparator: Intermediate lesion physiology-based management

The iFR/FFR/RFR measurements will be obtained using a coronary-pressure guidewire. For FFR, hyperemia will be induced with the administration of intravenous adenosine, in accordance with the clinical practice at each participating center. Lesion features prompting intervention instead of conservative medical approach will be the following: iFR ≤0.89, or FFR ≤0.80.(32) All lesions fulfilling these interventional criteria will be treated with an FFR guided DES implantation. PCI will be performed with the aim of achieving a post-stenting FFR ≥0.90 (i.e. optimal FFR result). If post-stenting FFR was \<0.90 a further post-dilation of the stent could be performed and if FFR remained at \<0.90, a pullback of the wire to identify another possible pressure drop and/or a subsequent stent implantation at least 5 mm from the stent will be performed according to physician's preference.