[Blood and urinary cyanide concentrations during long-term sodium nitroprusside perfusion].
Five deeply comatose neurological patients were administered a continuous perfusion of sodium nitroprusside (SNP) at the rate of 3 microgram.kg-1.min-1. The levels of blood cyanide (CN-) were measured two hours after the start, then every 12 hours during, and 12 and 24 hours after the end of perfusion. The urinary output of CN- was also studied. The results show that total blood CN- stabilized after 36 hours to a mean value of 0.11 mg/l. When perfusion was stopped, CN- blood levels dropped but did not reach pre-perfusion values at the 24th hour. Urinary excretion of CN- which reached a maximum value of 0.050 mg/24 h represents a negligible amount and does not explain the fall of blood CN- and the occurrence of a concentration plateau. The results showing lower values obtained on non-anesthetized patients during the first hours of perfusion compared to those of a previous study done under neuroleptanaesthesia are discussed. These results suggest that prolonged perfusions at SNP at the rate of 0.177 mg.kg-1.h-1 do not produce toxic blood level of CN-.
D000328:Adult; D001711:Biotransformation; D003486:Cyanides / Q000097:blood / Q000378:metabolism* / Q000652:urine; D004912:Erythrocytes / Q000378:metabolism; D005260:Female; D005292:Ferricyanides / Q000378:metabolism*; D006801:Humans; D007263:Infusions, Parenteral; D008297:Male; D008875:Middle Aged; D009599:Nitroprusside / Q000008:administration & dosage / Q000378:metabolism*; D013997:Time Factors
D003486:Cyanides; D005292:Ferricyanides; D009599:Nitroprusside
Etude des concentrations sanguine et urinaire en cyanure au cours de perfusion de nitroprussiate de sodium de longue durée.