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Some aspects of sodium nitroprusside reaction with human erythrocytes.

Sodium nitroprusside is an excellent agent for lowering blood pressure in hypertensive emergencies, for producing controlled hypotension during anesthesia, and for treating acute myocardial infarction and chronic heart failure. Toxic effects of this drug have been reported and above-normal cyanide and thiocyanate concentrations have been observed in the blood of a small proportion of subjects receiving nitroprusside. Nitrite, syanide, and thiocyanate are major decomposition products of nitroprusside, resulting from an in vitro reaction with human blood. On the basis of the conversion mechanism, we suggest that, in the cyanide/thiocyanate cycle, only cyanide is directly responsible for any acute toxicity attributed to sodium nitroprusside. In this work, the extent of cyanide production by erythrocytes in vitro was studied. The rate of detoxification of cyanide by human liver in vitro was experimentally determined and data from a search for a possible inhibitor of the nitroprusside/hemoglobin reaction are presented. Also, the possible mechanism of the nitroprusside/hemoglobin reaction is discussed.