Novel Mechanism of Delayed Coronary Obstruction after Transcatheter Aortic Valve Replacement for Severe Aortic Stenosis: "Uppercut Phenomenon".

Delayed coronary obstruction is a rare complication after transcatheter aortic valve replacement (TAVR), and leads to a high in-hospital mortality rate. Here, we present a case of unpredictable delayed coronary obstruction in the left main trunk (LMT) after self-expandable device implantation because the left coronary height was enough over 15 mm. LMT obstruction was caused by a heavy calcification that was pushing up from the outside of the LMT, like an "uppercut" phenomenon. Stent-in-stent technique was a useful option for this type of LMT obstruction.