Fig. 7. Haemodynamic parameters in a recovered South American rattlesnake Crotalus durissus (550 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 MCFP. P_sys, mean systemic blood pressure; P_CV, central venous pressure. (1 cm H₂O=0.098 kPa.)