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Inotropic (increase in systolic cell shortening) and automatic (rate of spontaneous contractions in the absence of electric stimulation) responses to noradrenaline (NA) determined in the same set of ventricular myocytes (n= 18). The responses were normalized to the respective maximum responses (Rmax). The mean pD2 value was significantly greater for the inotropic (7.36 ± 0.14) than for the automatic response (6.76 ± 0.16; P < 0.05).
