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Fig. 1. Biphasic inotropic effect of hypercapnic acidosis on toad ventricle. (A)
Continuous recording of developed tension (DT) and maximal rate of rise of
tension (+dT/dt) during isometric contraction. Hypercapnia
produced an abrupt decrease in contractility followed by recovery that
exceeded control values. (B) Overall results of the effect of acidosis on DT.
Data are means ± s.e.m. (N=49). *P<0.05 with
respect to values before hypercapnia.