• Military medicine · Jul 1991

    Treatment of cyanide poisoning.

    • J A Vick and H Froehlich.
    • Food and Drug Administration, Washington, DC 20204.
    • Mil Med. 1991 Jul 1; 156 (7): 330-9.

    AbstractThe object of this study was to evaluate the effectiveness of five regimens in treating cyanide poisoning. A series of anesthetized adult beagle dogs were instrumented to record hemodynamic and respiratory function and given 2.5 mg/kg sodium cyanide intravenously. The 10 control animals given only cyanide died at from 5 to 7 minutes. Therapy, as described below, was given to other groups at from 2 to 3 minutes following the cyanide administration. Artificial respiration did not alter the lethal effects of cyanide nor prolong survival time in any of the 10 animals. Amyl nitrite given by inhalation or by the intravenous route allowed survival of all 15 animals. Sodium nitrite (20 mg/kg), dimethylaminophenol (DMAP) (5 mg/kg), and hydroxylamine hydrochloride (5 mg/kg) given intravenously with no artificial ventilation also allowed for 100% survival (15 animals). Amyl nitrite, sodium nitrite, and sodium thiosulfate were ineffective when given intramuscularly (I.M.) (0 of 12 dogs); however, I.M. DMAP (5 mg/kg) and I.M. hydroxylamine hydrochloride (50 mg/kg) increased heart rate and blood pressure and restored spontaneous breathing. All 15 animals treated with I.M. doses of either of these drugs survived the lethal dose of cyanide. Results of these studies indicate that intravenous sodium nitrite, DMAP, and hydroxylamine hydrochloride, and amyl nitrite by inhalation, are all effective in reversing the lethal effects of cyanide poisoning. Only DMAP and hydroxylamine hydrochloride are effective when given by the intramuscular route. These results provide data to support an approach to therapy that is more practical and applicable where expert medical care may not be available following cyanide exposure.

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