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Published on: April 15, 2021
Coronary artery aneurysm: case report
Jeffrey E Everett1, Harold M Burkhart
1Division of Cardiothoracic Surgery, University of Tennessee Medical Center, 1940 Alcoa Highway, Suite E-260, Knoxville, Tennessee 37920, USA. jeverett@utmck.edu
Insights
Atherosclerotic aneurysms of the left main coronary artery are rare but can cause myocardial ischemia. Surgical exclusion and revascularization are effective treatments for these rare coronary artery aneurysms.
Area of Science:
- Cardiovascular Surgery
- Interventional Cardiology
Background:
- Left main coronary artery aneurysms are rare, occurring in 0.1% of angiographic series, often due to atherosclerosis.
- Other causes include connective tissue disorders, trauma, vasculitis, and congenital factors.
Observation:
- A 66-year-old man presented with a 2x2 cm saccular aneurysm of the distal left main coronary artery, calcification, and mild stenosis.
- The patient experienced a non-ST elevation myocardial infarction following surgery for a ruptured appendix.
Findings:
- Surgical resection and oversewing of the aneurysm were performed, followed by coronary artery bypass grafting.
- Pathology confirmed an atheromatous coronary artery aneurysm.
Implications:
- Left main coronary artery aneurysms are primarily atherosclerotic and present with myocardial ischemia due to embolism.
- Surgical exclusion and revascularization represent the optimal treatment strategy for these rare aneurysms.
Introduction:
Aneurysms of the left main coronary artery are rare with an incidence of 0.1% in large angiographic series. The majority are atherosclerotic in origin. Other causes include connective tissue disorders, trauma, vasculitis, congenital, mycotic and idiopathic. The primary complication is myocardial ischemia or infarction, with rupture being rare. Treatment options include anticoagulation, custom made covered stents, reconstruction, resection, and exclusion with bypass.
Case Presentation:
A 66 year-old man was referred for evaluation of a 2 x 2 centimeter saccular aneurysm originating from the distal left main coronary artery. There was associated calcification and mild stenosis of the LM. The workup was prompted by a non-ST elevation myocardial infarction suffered following a laparotomy for a ruptured appendix. The past medical history was pertinent for hypertension, hyperlipidemia, and a left carotid endarterectomy. Cardiopulmonary bypass with hyperkalemic cardioplegic arrest was utilized. The aneurysm was exposed in the atrioventricular groove. The aneurysm was resected and oversewn. Calcification precluded patch angioplasty. The patient then underwent coronary bypass grafting with the left internal thoracic artery placed to the left anterior descending artery and a reversed greater saphenous vein graft to an obtuse marginal branch of the circumflex artery. The postoperative course was uneventful and discharge to home occurred on the fourth postoperative day. Surgical pathology confirmed an atheromatous coronary artery aneurysm.
Conclusion:
Left main coronary artery aneurysms in adult patients are predominantly atherosclerotic in origin. The clinical presentation is that of myocardial ischemia, likely from associated embolism. Rupture is rare. Operative treatment is exclusion and revascularization.
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