Acute Stent Thrombosis: Technical Complication or Inadequate Antithrombotic Therapy? An Optical Coherence Tomography Study

Figure 1: Acute Stent Thrombosis: Technical Complication or Inadequate Antithrombotic Therapy? An Optical Coherence Tomography Study

Figure 2: Acute Stent Thrombosis: Technical Complication or Inadequate Antithrombotic Therapy? An Optical Coherence Tomography Study

A 68-year-old woman had been admitted to the hospital with non-STEMI and was found to have a 95% mid left anterior descending (LAD) artery stenosis (Figure 1A). The lesion was treated with a 2.50x18 mm Everolimus-eluting stent during bivalirudin infusion (Figure 1B). The patient was loaded with clopidogrel 600 mg as bivalirudin was discontinued. The patient experienced chest pain with anterior ST-segment elevations 70-minutes later. Emergent angiography demonstrated acute stent thrombosis (AST, Figure 2A). On heparin and eptifibatide, low-pressure angioplasty was performed. Optical coherence tomography (OCT) imaging revealed an area of minimal malapposition and a low-attentuation intravascular mass consistent with platelet-rich thrombus within the stent (Figure 2B). The stent was post-dilated and intravenous heparin and eptifibatide infusions were continued for 12 hours.

Based on the OCT findings and clinical course, what is the most likely reason for the occurrence of acute stent thrombosis?

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