Fig. 3From: Impact of impaired fractional flow reserve after coronary interventions on outcomes: a systematic review and meta-analysisPotential causes of suboptimal FFR after percutaneous coronary interventions. Panel a ‘geographical miss’ (diseased reference segment). Panel b stent mal-apposition. Panel c stent under-expansion. Panel d intrastent plaque-protrusion/thrombus. Panel e edge dissection. MLA - minimal lumen area, REF - proximal reference segmentBack to article page