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Updated: Jun 20, 2026

Primary Outcome Assessment in a Pig Model of Acute Myocardial Infarction
Published on: October 14, 2016
Echocardiographic progression of a subepicardial aneurysm after inferior myocardial infarction
Takaharu Hayashi1, Minoru Ichikawa, Chikao Yutani
1Cardiovascular Division, Kawachi General Hospital, 1-31 Yokomakura, Higashi-Osaka, Osaka 578-0955, Japan. takaharu@kawati.or.jp
Insights
A rare case of ventricular pseudoaneurysm developed after myocardial infarction treatment. Surgical intervention was successful in resecting the aneurysm.
Area of Science:
- Cardiology
- Cardiac Surgery
Background:
- A 62-year-old man experienced chest oppression, diagnosed as inferior myocardial infarction.
- Treatment involved percutaneous coronary intervention with stenting for the right coronary artery occlusion.
Observation:
- Four months post-intervention, echocardiography revealed a large left ventricular pseudoaneurysm.
- The patient was initially asymptomatic and declined surgery, with serial monitoring showing significant aneurysm growth.
Findings:
- The pseudoaneurysm enlarged to 48 mm diameter with a 22 mm orifice over seven months.
- Surgical resection of the aneurysm and repair with a pericardial patch were performed.
- Pathological examination confirmed myocardial elements in the aneurysm wall and thrombus.
Implications:
- This case highlights a rare complication of myocardial infarction treatment.
- Ventricular pseudoaneurysms require careful monitoring and timely surgical consideration.
- Successful surgical management of ventricular pseudoaneurysms is feasible.
Abstract:
A 62-year-old man presented to hospital with chest oppression. Coronary angiography revealed total occlusion of the right coronary artery and inferior myocardial infarction was diagnosed. He was treated by percutaneous coronary intervention with stenting for myocardial infarction. After four months, echocardiography revealed a huge aneurysm protruding below the inferior surface of the left ventricle. It was considered to be a pseudoaneurysm from the echocardiographic findings. The patient had no symptoms and he refused surgery, so progression of the aneurysm was monitored carefully. At seven months after revascularization, the aneurysm showed a marked increase in size, with a maximal diameter of 48 mm and orifice diameter of 22 mm. Accordingly, the patient agreed to undergo surgical excision. The aneurysm was resected and the defect was closed with a pericardial patch. Pathological examination revealed all of the myocardial elements in the aneurysm wall and thrombus in its lumen. In conclusion, this was a rare case of ventricular subepicardial aneurysm.
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