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A 74-year-old lady presented with chest pain 2 months after PCI treatment of a non-ST elevation myocardial infarction. Her past medical history was notable for systemic lupus erythematosus, hypertension and hypercholesterolaemia.
During the previous percutaneous coronary intervention (PCI), both the right coronary artery and left anterior descending (LAD) had been treated with stents.
During this procedure, the left main stem (LMS) was noted to have minor irregularity (figure 1A,B) but this was not considered to be obstructive.
She had been pain-free for 2 months, but had sudden onset of pain, and coronary angiography was undertaken. Coronary angiography demonstrated an unexpected linear lesion within the LMS (figure 1C–E) apparent in multiple views. Optimal therapy was discussed by the Heart Team MDT,
but what is the most likely cause of the apparent change in the LMS?
Artefact related to the radiographic projection and administration of intracoronary glyceryl trinitrate.
Iatrogenic dissection of the LMS caused by the stent procedure 2 months earlier.
Rupture of a non-obstructive atheromatous plaque.
Spontaneous dissection of the LMS.
For the answer see page 893
From the question on page 891
This diagnosis can be made by careful consideration and exclusion of the other diagnostic possibilities. Careful examination of the LMS in orthogonal views noting the persistence of the abnormality excludes radiographic projection artefact. Vasodilation after glyceryl trinitrate generally produces uniform vessel dilation without luminal abnormality.
A stent-related dissection would usually be evident on the procedural films and would relate to the proximal edge of the stent in the LAD rather than being geographically distinct.
Spontaneous coronary dissection typically occurs in non-atherosclerotic coronary arteries of younger women. The angiographic appearances usually reflect mural haematoma with luminal compression.1 When linear luminal filling defects occur, they involve longer coronary segments and are usually obstructive to antegrade flow. In this case, these characteristic features are absent, and the angiogram shows a diverticulum within the wall of LMS filling with contrast. Consequently, these appearances are much more likely to be related to a ruptured plaque with underlying cholesterol-rich material being washed out by circulating blood leaving a cavity within the vessel wall.
To confirm this, the diagnosis was clarified by the aid of frequency-domain optical coherence tomography (FD-OCT (Ilumien Optis PCI Optimization System, St Jude Medical, St Paul, Minnesota, USA) (figure 2A–D) which demonstrated a large ruptured atheromatous ulcer confluent with the lumen. This appearance contrasted with that of either spontaneous or mechanical dissection in which a true lumen is surrounded and compressed by a false lumen represented by adventitia and not by the intima/media demonstrated by OCT in this case.2 ,3
Contributors AB and RK performed the procedure and images analysis. GLDM and NR drafted the article. AB revised the manuscript. All the authors gave final approval.
Competing interests None.
Patient consent Obtained.
Provenance and peer review Not commissioned; internally peer reviewed.
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