Anesthesiology
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Sodium nitroprusside was investigated as a potential source of cyanide poisoning, Whole-blood cyanide determinations were performed on arterial samples from baboons receiving nitroprusside while anesthetized. There was a statistically significant increase in cyanide levels, as well as development of tachyphylaxis and severe metabolic acidosis. Hydroxocobalamin (vitamin B12a) infused simultaneously with nitroprusside significantly lessened the increase in cyanide levels and eliminated the development of metabolic acidosis. Nitroprusside can cause cyanide intoxication in the baboon, and hydroxocobalamin appears to be an effective antidote.
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A survey of hospitals with anesthesia residency training programs was undertaken to determine the frequency and types of complications encountered with the use of bulk supplies of oxygen and nitrous oxide. Of the responding hospitals, 98 per cent dispense oxygen from a central source and 80 per cent dispense nitrous oxide from a central source. Nearly a third of the hospitals responding reported the occurrence of serious or potentially serious accidents related to their bulk gas delivery systems. ⋯ More than half of the reported incidents were decreases in oxygen pipeline pressure, often resulting in insufficient delivery of oxygen for clinical use. Most complications related to pipeline accidents could have been prevented by observance of National Fire Protection Association regulations. Anesthesiologists should be familiar with these regulations and should understand the designs of gas delivery systems in their institutions.
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Cumulative d-tubocurarine dose-response curves were determined in 35 unpremedicated adult surgical patients. In five awake patients with and five awake patients without ulnar nerve block the median effective doses of d-tubocurarine necessary for 50 per cent depression of twitch tension (ED50) were 8.3 and 9.1 mg/m2, respectively. ⋯ The ED50's of d-tubocurarine were 4.8, 4.5, 2.5, 3.2, and 3.8 mg/m2 in patients anesthetized with 1.0 to 1.3 per cent alveolar concentrations of halothane for 10, 20, 40, 80, and 160 minutes, respectively. It is concluded that duration of anesthesia has no effect on neuromuscular blockade by d-tubocurarine.