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Impaired endothelial function in patients with myocardial bridge
Mehdi Zoghi1, Hamza Duygu, Sanem Nalbantgil
1Department of Cardiology, Ege University Medical Faculty, Izmir, Turkey.
Echocardiography (Mount Kisco, N.Y.)
|August 17, 2006
Summary
Myocardial bridging (MB) is linked to impaired endothelial function and increased atherosclerosis risk. Patients with MB show reduced brachial artery flow-mediated dilatation, with more severe dysfunction when atherosclerosis is present proximal to the bridge.
Area of Science:
- Cardiology
- Vascular Biology
- Diagnostic Imaging
Background:
- The association between myocardial bridging (MB) and ischemic heart disease remains debated.
- Evaluating atherosclerosis and endothelial function in MB patients is crucial for understanding disease mechanisms.
Purpose of the Study:
- To assess atherosclerosis and brachial artery endothelial function in patients with myocardial bridging.
- To investigate the relationship between MB, atherosclerosis, and endothelial dysfunction.
Main Methods:
- Coronary angiography and intravascular ultrasound (IVUS) were used to evaluate 50 MB patients and 30 controls.
- Brachial artery flow-mediated dilatation (FMD) and nitrate-dependent dilatation assessed endothelial function.
- Patients were stratified based on IVUS findings: without (IA) or with (IB) atherosclerotic lesions.
Main Results:
- MB patients exhibited significantly lower FMD compared to controls (6.4% vs 11%, P <0.001).
- Group IA (no atherosclerosis) showed higher FMD (7%) than Group IB (with atherosclerosis, 5.8%, P = 0.023).
- Atherosclerotic plaque was found proximal to the MB in 75% of Group IB patients.
Conclusions:
- Endothelial function is impaired in patients with myocardial bridging.
- Atherosclerosis shows a tendency to occur proximal to the MB.
- Endothelial dysfunction is more pronounced in MB patients with proximal atherosclerosis.