RESUMO
Effect of subcutaneously (s.c.) administered potassium cyanide (0.5 and 1.0 LD50) and inhalation of hydrogen cyanide (55 ppm or 60.6 mg/m3) for 30 minutes was studied on various physiological parameters related to dynamic pulmonary mechanics in anaesthetized rats. Total pulmonary phospholipid with its fractions were also estimated. Both s.c. (1.0 LD50) and inhalation exposures increased air flow, transthoracic pressure and tidal volume accompanied by significant decrease in pulmonary phospholipids. Inhalation of hydrogen cyanide also exhibited direct effect on the pulmonary cells as evidenced by decreased compliance. The study suggests that inhalation of cyanide is more injurious compared to parenteral route.
Assuntos
Animais , Cianetos/farmacologia , Cianeto de Hidrogênio/farmacologia , Pulmão/química , Complacência Pulmonar/efeitos dos fármacos , Medidas de Volume Pulmonar , Masculino , Fosfolipídeos/análise , Cianeto de Potássio/farmacologia , Surfactantes Pulmonares/análise , Ratos , Ratos WistarRESUMO
Since cassava (Manihot esculenta Crantz) is a staple food item of several million people in the tropics, its toxicity cannot be underestimated. Therefore an attempt has been made to understand the metabolic changes caused by the chronic administration of sublethal doses linamarin, the principal cyanoglucoside of cassava, to rabbits. A significant rise in lactic acid and total cholesterol in liver and brain and a highly significant depletion of phospholipids of brain tissue was observed. There were also significant variations in the lactate dehydrogenase isoenzyme pattern of treated animals as compared with the control rabbits. The findings suggest that some of the biological effects of linamarin are similar to those of free cyanide.