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[A clinicopathologic study of atrial infarction complicating left ventricular posterior myocardial infarction]
Insights
Atrial infarction is surprisingly common (28%) in patients with left ventricular posterior myocardial infarction due to right coronary artery blockages. This finding highlights a critical link between coronary artery disease and atrial health.
Area of Science:
- Cardiovascular Pathology
- Coronary Artery Disease
- Myocardial Infarction
Context:
- Clinicopathologic study of 400 autopsy cases.
- Focus on 46 cases with acute or old left ventricular (LV) myocardial infarction.
- Detailed examination of atrial tissues including appendages, sinus node region, and atrial walls.
Purpose:
- To investigate the incidence and characteristics of atrial infarction in patients with left ventricular posterior myocardial infarction.
- To determine the correlation between atrial infarction and lesions in the right coronary artery.
- To explore the association between atrial infarction and atrial fibrillation.
Summary:
- Atrial infarction was identified in 28% (13 of 46) of cases with LV posterior infarction caused by right coronary artery lesions.
- Right atrial infarction was more prevalent, occurring in 10 cases, with 3 also showing left atrial involvement.
- A significant association was observed between atrial infarction and transient atrial fibrillation in the acute phase of ventricular infarction.
Impact:
- Reveals a higher-than-expected incidence of atrial infarction linked to proximal right coronary artery disease.
- Suggests that severe stenosis or obstruction of the right coronary artery is a key risk factor for atrial infarction.
- Underscores the importance of considering atrial complications in patients with specific patterns of myocardial infarction.
Abstract:
Among a series of 400 consecutive autopsy cases we performed a clinicopathologic study of atrial infarction in 46 autopsy-proven cases, which had acute or old left ventricular (LV) myocardial infarction. We used blocks taken from both atrial appendages, the region of the sinus-node, the lateral wall of the right atrium, the posterior wall of the right atrium, and the posterolateral wall of the left atrium. Atrial infarction was identified in 13 (28%) of 46 cases with LV posterior infarction which was caused by lesions of the right coronary artery; 10 cases were right atrial infarction and 3 were both right and left atrial infarction. Among 13 cases in which the acute phase of ventricular infarction could be followed, 3 cases exhibited transient atrial fibrillation. Of these 3 cases, 2 had atrial infarction. The mean stenotic index of the proximal right coronary artery was 4.3/5 in the 13 cases of atrial infarction, 3.2/5 in 17 cases of acute necrosis or scar and 3.1/5 in 16 cases without ischemic atrial lesions. Most of the atrial infarction was found in the right atrium; 10 in the right atrial appendage, 8 in the right atrial lateral wall, 3 in the region of the sinus node and the left atrial posterolateral wall, 2 in the right atrial posterior wall, and one in the left atrial appendage. In conclusion, the incidence of atrial infarction was unexpectedly high (28%) in LV posterior infarction caused by lesions of the proximal right coronary artery, particularly in severe stenosis or obstruction.