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Anatomic findings in acute papillary muscle necrosis
I Coma-Canella1, C Gamallo, P M Onsurbe
1Coronary Care Unit, Hospital La Paz, Madrid, Spain.
American Heart Journal
|December 1, 1989
Summary
Acute papillary muscle necrosis, often linked to cardiac hypertrophy, frequently causes severe outcomes like cardiogenic shock. Mitral regurgitation plays a key role in patient impairment and mortality.
Area of Science:
- Cardiology
- Pathology
Background:
- Papillary muscle necrosis is a critical complication of acute myocardial infarction.
- Understanding its impact on left ventricular function and patient outcomes is essential.
Purpose of the Study:
- To investigate the consequences of acute papillary muscle necrosis of the left ventricle.
- To identify associated pathological findings and clinical outcomes.
Main Methods:
- Retrospective analysis of 25 cases with papillary muscle necrosis from 133 autopsies of acute myocardial infarction.
- Evaluation of cardiac hypertrophy, location and extent of necrosis, and associated conditions.
Main Results:
- Cardiac hypertrophy was present in 84% of cases.
- Posterior papillary muscle involvement was most common (13 cases).
- Left ventricular necrosis ranged from 11% to 75% of ventricular mass; 68% had right ventricular infarction.
- 19 cases experienced cardiogenic shock, 4 pulmonary edema, and 2 sudden death.
Conclusions:
- Papillary muscle necrosis is frequently associated with cardiac hypertrophy, posterior ventricular necrosis, and subendocardial infarction.
- Acute mitral regurgitation is a significant contributor to clinical impairment and mortality, particularly in cases with smaller necrosis areas.