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The effects of aqueous leaf extract of Bryophyllum pinnatum on the blood pressure of anaesthetized cats, as well as on the liver and kidney status of the rabbit were investigated in this study. The results revealed that, the extract produced a small fall in the blood pressure of the anaesthetized cat and also reduced the effect of adrenaline-induced elevation of blood pressure. In rabbits, biochemical analysis of serum was carried out; urea and creatinine were used as tests of its effect on the renal function while alkaline phosphatase (ALP), aspartate transaminase (AST) and alanine transaminase (ALT) served as enzyme indices of the liver function. In addition, the tissues of the liver and kidney were microscopically examined. The treated rabbits showed a significant decrease (P 0.05) was recorded in the AST and ALT aminotransferases of both the treated and control animals. The increase recorded in the treated group was much higher (8.64 and 13.63%) as compared to the control group (0.69 and 7.05%). The histopathological examination of the kidney and liver of treated animals showed shrunken glomeruli with increased urinary space, mild necrosis of the tubules and hyaline droplets, while the liver tissue revealed necrosis of the liver cells, lymphocytic infiltration and pericuffing of the bile duct. The control animals, however, showed normal histological structure. In addition after 4 weeks of treatment, body weight in the control group was significantly higher than those in the treated group. It was concluded that the pharmacological basis for the use of B. pinnatum among the Igbos of Nigeria to lower blood pressure was established by this study. However, the facts that the reduction in blood pressure produced is slight and the B. pinnatum leaf extract is potentially organotoxic negate its use as a blood pressure lowering agent.

Assessment of the medical benefit in the folkloric use of Bryophyllum Pinnatum leaf among the Igbos of Nigeria for the treatment of hypertension