Summary
The contractions of isolated spiral strips from bovine and porcine coronary arteries were induced by potassium depolarization. The preparations were relaxed by verapamil and/or isoproterenol.
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1.
The non-activated preparation of bovine artery has a basal tone corresponding to 15±1.7% of the maximum of developed tension.
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2.
The contraction induced by potassium depolarization was largely prevented by 11.3 μg/ml of verapamil. In this preparation, however, 2.8 μg/ml of noradrenaline relaxed the depolarized spiral strip to the same degree as compared with values of the polarized arteries.
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3.
The depolarized, activated preparation is more relaxed by inhibition of calcium ion influx (verapamil) than by activation of beta-adrenergic receptors (isoproterenol). The relaxing effect takes place in the following order: noradrenaline (51.7%) < isoproterenol (86.1%) < verapamil (100%).
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4.
The polarized, non-activated preparation is more relaxed by stimulation of beta-adrenergic receptors (isoproterenol) than by inhibition of calcium ion influx (verapamil). The relaxing effect takes place in the following order: verapamil (64.4%) < noradrenaline (85.3%) < isoproterenol (100%).
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5.
The degree of maximal relaxation after verapamil, noradrenaline, or isoproterenol increases in the polarized preparation with augmented fibre stretch.
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Peiper, U., Schmidt, E. Relaxation of coronary arteries by electro-mechanical decoupling or adrenergic stimulation. Pflugers Arch. 337, 107–117 (1972). https://doi.org/10.1007/BF00587834
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DOI: https://doi.org/10.1007/BF00587834