Abstract
The effects of calcium and temperature on the tension of isolated canine coronary arterial strips were studied. In 20 mEq·l −1 K solution, the tension was significantly increased from 0 mg with 0 mEq·l −1 Ca to 33±18 mg with 0.2 mEq·l −1 Ca at 37°C, from −40±18 mg with 0 mEq·l −1 Ca to −17±11 mg with 0.2 mEq·l −1 Ca at 30°C, from −77±19 mg with 0 mEq·l −1 Ca to −52±17 mEq·l −1 with 1 mEq·l −1 Ca at 25°C, from −88±13 mg with 0 mEq·l −1 Ca to −41±18 mg with 2 mEq·l −1 Ca at 20°C, from −125±16 mg with 0 mEq·l −1 Ca to −116±13 mg with 2 mEq·l −1 Ca at 15°C. Ca higher than 0.2 mEq·l −1 produced a dose-dependent increase in tension between 37°C and 15°C. In spite of the presence of 4 mEq·l −1 Ca, the development of tension was strongly supressed by lowering the temperature below 20°C, and completely inhibited at 10°C. The rate of a decrease in tension caused by cooling was about 5.5 mg·°C−1. This study demonstrated that Ca2+ produced a dose-dependent increase in tension in high-K solution, which was suppressed as the temperature was lowered.
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Yoshida, K., Fujii, Y., Ina, H. et al. Effects of calcium and temperature on tension in isolated canine coronary artery. J Anesth 5, 172–176 (1991). https://doi.org/10.1007/s0054010050172
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DOI: https://doi.org/10.1007/s0054010050172