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[Left ventricular aneurysm with normal coronary arteriogram after myocardial infarction]
1Department of Cardiology, Asahikawa Kohsei Hospital.
Kokyu to Junkan. Respiration & Circulation
|December 1, 1992
Summary
Rare cases of left ventricular aneurysms after myocardial infarction (MI) occurred without coronary artery obstruction. These findings suggest alternative mechanisms beyond severe coronary artery disease contribute to this serious cardiac complication.
Area of Science:
- Cardiology
- Cardiovascular Research
- Medical Diagnostics
Background:
- Left ventricular aneurysms (LVAs) are typically linked to severe coronary artery disease following myocardial infarction (MI).
- However, LVAs with a normal coronary arteriogram are exceptionally uncommon, with limited prior documentation, particularly in Japan.
Observation:
- A study analyzed 1800 patients undergoing coronary cineangiography and left ventriculography.
- Five patients (4 male, 1 female, aged 34-83) were identified with LVAs and minimal to no coronary obstruction.
- None of the affected patients reported a history of angina; all experienced their first MI as a sudden chest pain event.
Findings:
- The primary causes for MI in these cases were suspected to be coronary spasm and/or thromboembolic events.
- One patient exhibited a positive response during a coronary induction test.
- The development of LVAs post-MI with normal coronary arteriograms may be attributed to poor collateral circulation and preserved viable myocardium contraction.
Implications:
- This study highlights that LVAs after MI can occur in the absence of significant coronary artery disease.
- It suggests exploring alternative etiologies such as coronary spasm or thromboembolism for MI leading to LVA.
- Further research is warranted to understand the specific pathophysiological mechanisms and optimize diagnostic and therapeutic strategies for these rare cases.