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Fig. 5. Haemodynamic effects of blood volume alterations in South American rattlesnakes Crotalus durissus, as a function of mean circulatory filling pressure (MCFP) measured at each blood volume change. (A) Psys, mean systemic blood pressure; (B) PCV, central venous pressure; (C) fH, heart rate; (D) pul, pulmonary cardiac output; (E) sys, systemic cardiac output; (F) tot, total cardiac output. Black symbols represent the untreated group and grey symbols represent the {alpha}-blocked group. Triangles indicate control values at normal blood volume. Values are means ± S.E.M. (N=6 for each group). * indicates a significant difference relative to control values. {dagger} indicates a significant difference between the two groups of snakes. (1 cm H2O=0.098 kPa.)





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