Table 4.

Definitions of OCT findings.31, 32, 33, 34, 35

Findings	Definition
Edge dissection	Linear rim of tissue with a width >0.2 mm and a clear separation from the vessel wall or underlying plaque that was adjacent (<5 mm) to a stent edge. Longitudinal extension >2 mm, lateral extension >60° and involvement of deeper layers (medial or adventitia) are considered large dissections.
Intrastent plaque/thrombus protrusion	Tissue prolapsing between stent struts extending inside a circular arc connecting adjacent struts or intraluminal mass >0.5 mm in thickness with no direct continuity with the surface of the vessel wall or highly backscattered luminal protrusion in continuity with the vessel wall and resulting in signal-free shadowing.
Reference lumen narrowing	Lumen area <4.5 mm2 in the presence of significant plaque adjacent to stent endings.
Stent malapposition	Stent-adjacent vessel lumen distance >0.4 mm with longitudinal extension >1 mm.
In-stent minimal luminal cross-sectional area (MLA)	In-stent MLA <4.5 mm2 and <70% of the average reference lumen area is considered significant.

OCT, optical coherence tomography.