Coronary vasomotor tone during static and dynamic exercise
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چکیده
منابع مشابه
Evidence for Persistent Arteriolar Vasomotor Tone During Coronary Hypoperfusion
The goals of this study were to test the following hypotheses: 1) Coronary autoregulatory adjustments to decreases in perfusion pressure occur primarily in coronary arterioles (<150 ,um in diameter). 2) Small coronary arteries (>150 ,um in diameter) can be recruited to participate in the autoregulatory adjustments as perfusion pressure is progressively lowered. 3) Small arterioles are the locat...
متن کاملNitroso-redox balance in control of coronary vasomotor tone.
Reactive oxygen species (ROS) are essential in vascular homeostasis but may contribute to vascular dysfunction when excessively produced. Superoxide anion (O(2)(·-)) can directly affect vascular tone by reacting with K(+) channels and indirectly by reacting with nitric oxide (NO), thereby scavenging NO and causing nitroso-redox imbalance. After myocardial infarction (MI), oxidative stress incre...
متن کاملGenetic determinants of coronary vasomotor tone in humans.
APART FROM AND IN ADDITION to all established mechanisms and mediators in the regulation of coronary blood flow under normal and pathological circumstances (1), there remains substantial interindividual variability in coronary vasomotor responses, both in the experimental animal and in humans. Such interindividual variability has, among other factors such as age, diet, and environmental factors...
متن کاملDiastolic time during static and dynamic exercise in myocardial infarction.
To evaluate the difference in the response of DT in the early phase of static (sustained weight load) and dynamic (treadmill) exercise, the relation of DT and HR was studied by ear densitography in 11 patients with myocardial infarction. None of the patients had an ischemic electrocardiographic response during exercise. Despite an increase in HR and the pressure-HR product with both types of ex...
متن کاملCoronary Doppler intensity changes during handgrip: a new method to detect coronary vasomotor tone in coronary artery disease.
OBJECTIVES This study evaluates whether a quantitative measurement of Doppler intensity during handgrip may disclose coronary vasomotor dysfunction in patients with coronary artery disease (CAD). BACKGROUND Atherosclerotic coronary segments show an exaggerated constrictive response to handgrip. The intensity of the scattered Doppler signal is proportional to the number of blood cells flowing ...
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ژورنال
عنوان ژورنال: European Heart Journal
سال: 1989
ISSN: 0195-668X,1522-9645
DOI: 10.1093/eurheartj/10.suppl_f.105