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- W2021053057 abstract "1. The electrophysiological effects of CRE-1087, a new antiarrhythmic drug, were studied in guinea-pig papillary muscles. 2. CRE-1087 (10(-7) M-10(-4) M) produced a concentration-dependent decrease in the action potential amplitude and Vmax of the upstroke without altering the action potential duration or the resting membrane potential. 3. At 5 x 10(-6) M, CRE-1087 produced a 5.0 +/- 1.0% tonic Vmax block and this value was not modified at the different rates of stimulation tested. In the presence of CRE-1087, trains of stimuli at rates between 0.5 and 3 Hz led to an exponential decline in Vmax (frequency-dependent Vmax block) which augmented at higher rates of stimulation. At 2 Hz the onset kinetics of the frequency-dependent Vmax block was fitted by a monoexponential function being the K value 0.099 +/- 0.012 AP-1. The time constant for the recovery of Vmax from the frequency-dependent block was prolonged to 18.3 +/- 1.5 s. 4. CRE-1087 (5 x 10(-6) M) did not shift the membrane responsiveness curve. 5. CRE-1087 had no effect on the characteristics of the slow action potentials elicited by isoprenaline in ventricular fibres depolarized by 27 mM KCl, which suggested that CRE-1087 did not exhibit class IV (Ca antagonist) antiarrhythmic actions. 6. The slow onset and the slow offset kinetics of frequency-dependent Vmax block during repetitive activity suggested that in guinea-pig ventricular muscle fibres CRE-1087 exhibited class Ic antiarrhythmic actions." @default.
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- W2021053057 date "1992-10-01" @default.
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- W2021053057 title "Electrophysiological effects of CRE-1087 in guinea-pig ventricular muscles" @default.
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- W2021053057 doi "https://doi.org/10.1111/j.1476-5381.1992.tb12776.x" @default.
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