Key result
Hypoxia caused a sustained contraction in isolated sheep coronary artery rings and potentiated the contractile effects of U46619 and 5-HT, as well as the vasodilator effects of noradrenaline.
Why the study?
Does hypoxia alter the pharmacological responsiveness of isolated sheep coronary artery rings?
Population
Isolated circumflex coronary artery rings from sheep (large: 2-2.5 mm o.d., small: 0.6-1.3 mm o.d.)
Comparison
Hypoxia (0% O2) vs Oxygenated conditions (95% O2 or 12% O2)
Design
Preclinical
Authors
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Highlights potential hypoxic effects on coronary tone in ischemia; extends animal models but remains hypothesis-generating without human data.
Does hypoxia alter the pharmacological responsiveness of isolated sheep coronary artery rings?
Hypoxia induces contraction and alters the responsiveness of coronary arteries to constrictor and dilator mediators, which may have relevance to the pathophysiology of myocardial ischemia and angina pectoris.
Kwan et al. (1989) studied this question. Hypoxia vs. Oxygenated conditions was evaluated on Contractile and relaxant responses of coronary artery rings. Hypoxia caused a sustained contraction in isolated sheep coronary artery rings and potentiated the contractile effects of U46619 and 5-HT, as well as the vasodilator effects of noradrenaline.
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