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Isolated circumflex coronary artery obstruction
Insights
Isolated circumflex artery obstruction affects 1% of patients with suspected coronary artery disease. This condition causes angina, chest pain, or myocardial infarction with minimal left ventricular damage.
Area of Science:
- Cardiology
- Interventional Cardiology
- Diagnostic Imaging
Background:
- Coronary artery disease is a leading cause of mortality worldwide.
- The circumflex artery is a major coronary vessel supplying the left ventricle.
- Isolated lesions in the circumflex artery are less common but can present with significant symptoms.
Purpose of the Study:
- To investigate the clinical presentation and angiographic findings of isolated circumflex artery obstruction.
- To assess the impact of circumflex artery lesions on left ventricular function and electrocardiographic patterns.
Main Methods:
- Retrospective analysis of 1,000 patients undergoing selective coronary angiography.
- Identification of patients with isolated circumflex artery obstruction.
- Clinical data review including symptoms, electrocardiograms (ECGs), and left ventricular function assessment.
Main Results:
- 10 out of 1,000 patients (1%) had isolated circumflex artery obstruction.
- Common presentations included typical angina pectoris, atypical chest pain, and myocardial infarction.
- Left ventricular damage was mild (<20% circumference).
- Left axis deviation was frequently observed on ECGs.
- Left ventricular function (ejection fraction, diastolic pressure) was generally preserved.
Conclusions:
- Isolated circumflex artery obstruction is an uncommon finding in patients undergoing coronary angiography.
- The clinical spectrum ranges from angina to myocardial infarction, with typically mild left ventricular impairment.
- ECG abnormalities, particularly left axis deviation, may be associated findings.
Abstract:
Isolated obstruction of the circumflex branch of the left coronary artery was present in 10 of 1,000 patients undergoing selective coronary angiography for suspected coronary artery disease. The clinical syndrome consisted of typical angina pectoris (six patients), atypical chest pain (three patients) and episodes of myocardial infarction (three patients). Left ventricular damage was mild, never involving more than 20% of the left ventricular circumference as measured during angiography. Left axis deviation was very common on the ECG. In eight patients, the ECG showed a mean frontal QRS axis of 0 degrees or less and in two, an axis of less than -30 degrees. The circumflex lesion typically occurred toward the end of the proximal third of the artery, often immediately after its major anterolateral marginal branch. Two patients had complete obstruction and eight had subtotal circumflex narrowing: the clinical picture was not differnet in these two subgroups. Overall left ventricular function, as measured by ejection fraction and left ventricular diastolic pressure, was normal in most of the patients. End-diastolic pressure was slightly increased in five patients, two of whom also had systemic hypertension.