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[Sudden death presenting cardiac tamponade in a case of coronary dissection]
Insights
Sudden cardiac death in a 56-year-old man was caused by primary coronary artery dissection leading to aortic rupture and cardiac tamponade. This rare condition, involving the right coronary artery, resulted in a fatal outcome despite attempted intervention.
Area of Science:
- Cardiology
- Pathology
- Medical Case Reports
Background:
- Primary coronary artery dissection is a rare condition, often presenting with acute coronary syndromes.
- Sudden cardiac death can be a consequence of coronary artery dissection, particularly when associated with aortic pathology.
Observation:
- A 56-year-old male presented with loss of consciousness and chest pain, diagnosed with myocardial infarction and complete atrioventricular block.
- Coronary angiography revealed dissection and obstruction of the right coronary artery (RCA), unresponsive to urokinase treatment.
- Autopsy confirmed localized ascending aortic dissection with rupture into the pericardial space, cardiac tamponade, and a torn RCA.
Findings:
- Histological examination showed media thinning at the torn site of the RCA, suggesting a localized defect.
- The perivascular space of the RCA communicated with the aortic dissection, indicating a potential pathway for rupture.
- This case represents the third documented instance of primary coronary dissection presenting as cardiac tamponade.
Implications:
- Primary coronary artery dissection should be considered in the differential diagnosis of sudden cardiac death, especially with associated aortic abnormalities.
- Understanding the pathogenesis of primary coronary dissection is crucial for potential therapeutic strategies.
- Further research into the etiology and management of this rare condition is warranted.
Abstract:
A case is reported of a 56-year-old man with primary coronary dissection presenting as sudden death due to aortic rupture and cardiac tamponade. He was admitted because of loss of consciousness and chest pain. ECG showed complete atrioventricular block and myocardial infarction. Coronary angiography demonstrated coronary dissection and total obstruction of right coronary artery (RCA). Intracoronary injection of urokinase was not effective for recanalization of RCA. He died suddenly two days later. At autopsy, the proximal site of the ascending aorta was dissected locally and had ruptured into a pericardial space. RCA was torn off. The perivascular area around the torn coronary artery communicated with the dissecting space of the ascending aorta. Histologically, no degeneration or infiltration of inflammatory cells was observed in the media of the aorta and the right coronary artery. Histological change was observed only at the media of the torn site of the coronary artery. The thickness of the media was about half of that at the other site of the coronary artery. This is the third case reported in world medical literature of primary coronary dissection presenting as cardiac tamponade.