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[Obstruction of the left coronary branch. Ergometric, hemodynamic and angiographic findings]
Insights
Complete obstruction of the left main stem coronary artery is rare but treatable. Surgical intervention led to symptom-free recovery in most patients, highlighting the importance of collateral circulation.
Area of Science:
- Cardiology
- Vascular Medicine
- Interventional Cardiology
Background:
- Left main stem coronary artery (LMSCA) obstruction is an uncommon yet critical condition.
- This study reviews 6 personal cases and relevant literature on LMSCA obstruction, accounting for 0.66% of angina patients undergoing coronary angiography.
Purpose of the Study:
- To analyze the epidemiological, clinical, ergometric, hemodynamic, angiographic, and therapeutic aspects of complete LMSCA obstruction.
- To evaluate the role of collateral circulation and surgical outcomes in patients with LMSCA obstruction.
Main Methods:
- Case series of 6 patients with complete LMSCA obstruction.
- Review of epidemiological, clinical, ergometric, hemodynamic, and angiographic data.
- Surgical intervention and post-operative follow-up, including exercise testing.
Main Results:
- Patients presented with moderate symptoms, primarily exercise-induced angina.
- Standard exercise tests revealed significant abnormalities, necessitating precautions during coronary angiography.
- Four out of six patients had normal hemodynamic data; two had altered data.
- Collateral circulation played a crucial role, potentially underestimated in arteriography.
- Five patients underwent successful surgery with uneventful recovery and remained symptom-free.
- Post-operative exercise tests showed excellent results in three patients; one had persistent ischemia due to poor distal perfusion, and another showed good response to diltiazem.
Conclusions:
- Complete LMSCA obstruction, though rare, can be managed effectively with surgical intervention.
- Adequate collateral circulation is vital for patient outcomes and may be facilitated by the absence of right coronary artery lesions.
- Long-term symptom-free recovery is achievable, with good functional status demonstrated by post-operative exercise testing.
Abstract:
The authors present 6 personal cases of complete obstruction of the left main stem coronary artery and review the main epidemiological, clinical, ergometric, haemodynamic, angiographic and therapeutic data concerning this condition which is uncommon (0.66% of patients who underwent coronary angiography for angina in this series). This series had a number of special features. Clinical symptoms were moderate, consisting of exercise-induced aggravated angina, except in one patient with a history of anterior infarction complicated by regressive initial heart failure with residual angina. For this reason, all patients were able to perform a standard exercise-test on an ergometric bicycle without any problem. As the exercise test revealed major abnormalities, extreme precautions were observed when coronary angiography was performed, but no incident occurred in any of the 6 patients. Haemodynamic data were normal in 4 cases and altered in 2 cases. The important role played by collateral circulation must be stressed; it is probably under evaluated at arteriography. The absence of lesion of the right coronary artery is thought to facilitate the development of a collateral vascular network. Five patients were operated upon, made an uneventful recovery and were followed up for 19, 42, 17, 5 and 2 months respectively: all were symptom-free under medical treatment. In 3 out of these 5 patients who underwent a post-operative exercise-test all parameters showed excellent results; however, the 4th patient proved unadaptable to exercise, and ECG showed persistent ischaemia due to a very poor distal coronary bed; in the 5th patient, under diltiazem, the results on ischaemia and on the circulatory signs of heart failure were very good.(ABSTRACT TRUNCATED AT 250 WORDS)