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Transient left anterior hemiblock during angina pectoris: coronarographic aspects and clinical significance
Insights
Transient left anterior hemiblock during angina may signal impending myocardial infarction. This finding indicates severe left anterior descending artery obstruction, highlighting a critical diagnostic marker for high-risk cardiac events.
Area of Science:
- Cardiology
- Cardiac Electrophysiology
- Interventional Cardiology
Background:
- Unstable angina is a critical condition requiring prompt diagnosis and intervention.
- Left anterior hemiblock (LAH) is an electrocardiographic finding that can occur in various cardiac conditions.
- The association between transient LAH during angina and underlying coronary artery disease requires further elucidation.
Purpose of the Study:
- To investigate the clinical significance of transient left anterior hemiblock appearing during angina pectoris attacks.
- To determine the correlation between this electrocardiographic finding and the severity of coronary artery disease, specifically left anterior descending artery obstruction.
- To assess the prognostic implications of transient LAH in patients with unstable angina.
Main Methods:
- Retrospective review of 6 patients experiencing left anterior hemiblock during angina attacks.
- Inclusion criteria: fulfillment of unstable angina criteria, including one case of Prinzmetal variant angina.
- Diagnostic procedures: Coronary arteriography to assess coronary artery anatomy and lesion severity.
Main Results:
- All 6 patients exhibited significant coronary artery disease.
- Severe (70-100%) stenosis of the left anterior descending artery was present in all cases.
- Two patients with three-vessel disease had poor outcomes, including death from myocardial infarction and arrhythmias; two survivors of surgery remained asymptomatic.
Conclusions:
- Transient left anterior hemiblock during angina may serve as a harbinger of acute myocardial infarction.
- This electrocardiographic pattern strongly suggests critical obstruction in the left anterior descending coronary artery.
- Early recognition of this sign may prompt timely intervention in high-risk cardiovascular patients.
Abstract:
The data of 6 patients in whom a left anterior hemiblock appeared in the course of angina pectoris attacks were reviewed. All 6 patients were found to fulfill the criteria for unstable angina. 1 patient who presented the features of Prinzmetal variant angina was included in this group. Coronary arteriography showed significant coronary artery disease in all 6 patients involving 3 vessels in 2 patients, 2 vessels in 1 and 1 vessel in 3. A severe lesion (70--100%) of the left anterior descending artery in the vicinity of the first perforator was demonstrated in every case. The 2 patients with 3-vessel disease were not operable and died 4 and 5 days after the hemodynamic study. These deaths were caused by myocardial infarction with cardiogenic shock in one case and intractable ventricular arrhythmias in the other case. 4 patients were operable and underwent aortocoronary saphenous bypass surgery. There were 2 operative deaths. The 2 survivors are asymptomatic 7 and 16 mth after surgery. This study suggest that transient left anterior hemiblock during an attack of angina pectoris may be a feature of impending myocardial infarction and may be indicative of a severe obstruction of the left anterior descending coronary artery.