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[Endothelium-dependent and independent vasodilation in young males with previous myocardial infarction]
1Gottsegen György Országos Kardiológiai Intézet, Kardiológiai Osztály, Budapest.
Insights
Young patients with myocardial infarction exhibit impaired flow-mediated vasodilatation, a key indicator of endothelial function. This impairment is more severe in those with multivessel coronary artery disease, highlighting its link to disease extent.
Area of Science:
- Cardiology
- Vascular Biology
- Endothelial Function
Background:
- Flow-mediated vasodilatation (FMD) of brachial arteries is a non-invasive measure of endothelial function.
- Impaired FMD is linked to cardiovascular risk factors and the severity of coronary artery disease (CAD).
Purpose of the Study:
- To investigate the relationship between FMD and CAD morphology in young myocardial infarction (MI) patients.
- To compare endothelial-dependent and independent vasodilatation in young MI patients versus healthy controls.
Main Methods:
- Studied 28 young male MI patients (22-40 years) and 14 healthy controls (18-36 years).
- Classified MI patients into one-vessel disease (n=16) and multivessel disease (n=12) groups.
- Assessed FMD via reactive hyperemia and nitroglycerin-induced (NTG) vasodilatation using high-resolution ultrasound.
Main Results:
- MI patients demonstrated significantly impaired FMD compared to controls (p < 0.01).
- FMD was lower in the multivessel disease group than in the one-vessel disease group.
- NTG-induced vasodilatation was similar in both MI and control groups, indicating preserved endothelium-independent function.
Conclusions:
- Young MI patients exhibit impaired endothelium-dependent vasodilatation.
- Reduced FMD correlates with the angiographic extent of CAD in young MI survivors.
- Endothelial dysfunction is a significant factor in young patients with coronary artery disease.
Introduction:
Flow-mediated vasodilatation of brachial arteries, a non-invasive parameter of endothelial function, is correlated with cardiovascular risk factors. An impairment of flow-mediated vasodilatation in the brachial artery is related to the extent of coronary artery disease.
Aims:
The authors examined the relationship between flow-mediated vasodilatation and coronary artery disease morphology in young patients who had myocardial infarction.
Patients And Methods:
28 young patients (all men) with myocardial infarction (age 22-40, mean age: 35 years). Coronarography revealed one vessel disease in 16 patients (A group) and multivessel disease in 12 patients (B group). The control group was 14 healthy, young patients (age 18-36 years mean age: 30 years) (C group). The authors examined in all subjects flow-mediated, endothelium-dependent vasodilatation following reactive hyperaemia and nitroglycerin induced (NTG), endothelium-independent vasodilatation in the brachial artery with high resolution ultrasound (Acuson 128 X P/10).
Results:
Patients after myocardial infarction showed impaired flow-mediated vasodilatation compared to those of controls. (p < 0.01). Flow-mediated vasodilatation was lower in multivessel disease compare to one vessel disease. Nitroglycerin induced similar degrees of vasodilatation in the myocardial infarction and control groups.
Conclusion:
Young patients with myocardial infarction may have impaired endothelium-dependent dilatation and the decrease of flow-mediated vasodilatation is related to the angiographic extent of coronary artery disease.