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Fig. 1. Haemodynamic parameters in an anaesthetised South American rattlesnake Crotalus durissus (525 g), before and after injection of adrenaline (10 µg kg-1), phenylephrine (10 µg kg-1) and isoproterenol (10 µg kg-1). Arrows indicate injection of the various drugs. Grey bars indicate occlusion of blood flow from the heart to measure mean circulatory filling pressure (MCFP). Psys, systemic blood pressure; PCV, central venous pressure; pul, pulmonary cardiac output; LAo, left aortic cardiac output; fH, heart rate. (1 cm H2O=0.098 kPa.)





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