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Rupture of ventricular septum or papillary muscle complicating myocardial infarction

Z Vlodaver, J E Edwards

    Circulation
    |May 1, 1977
    PubMed

    Insights

    Left ventricular rupture following myocardial infarction is a serious complication. Isolated ruptures of the free wall, septum, or papillary muscle occurred in most cases, with significant clinical implications.

    Area of Science:

    • Cardiology
    • Pathology
    • Clinical Medicine

    Background:

    • Left ventricular rupture is a life-threatening complication of acute myocardial infarction (AMI).
    • Atherosclerotic coronary disease is the primary cause of AMI leading to ventricular rupture.
    • Understanding the specific rupture sites and their associations is crucial for patient outcomes.

    Purpose of the Study:

    • To investigate the incidence and patterns of left ventricular rupture complicating AMI.
    • To correlate the location of rupture with the type and location of the underlying myocardial infarction.
    • To analyze the clinical presentation and survival associated with different types of ventricular rupture.

    Main Methods:

    • Retrospective analysis of 98 autopsy specimens with left ventricular rupture complicating AMI.
    • Categorization of rupture types: single structure (free wall, septum, papillary muscle) versus multiple structures.
    • Correlation of rupture site with infarct location (inferolateral, anteroseptal) and type (transmural, subendocardial).
    • Review of clinical data, including circulatory collapse and survival duration.

    Main Results:

    • Isolated rupture occurred in 90 specimens: free wall (52), ventricular septum (18), papillary muscle (20).
    • Eight cases involved rupture of two structures, most commonly septum and free wall.
    • Inferolateral infarction was associated with papillary muscle rupture; anteroseptal infarction with septal rupture.
    • Transmural infarction was universal in septal rupture; subendocardial infarction seen in 11/20 papillary muscle ruptures.
    • Circulatory collapse was frequent in septal and papillary muscle ruptures; early death (<1 week) common with total papillary muscle or septal rupture.

    Conclusions:

    • Left ventricular rupture patterns vary, with isolated free wall, septal, and papillary muscle ruptures being most common.
    • Specific infarct locations correlate with particular rupture sites.
    • Rupture of the ventricular septum or papillary muscle carries a high risk of circulatory collapse and early mortality, though partial papillary muscle rupture may allow longer survival.

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