THE MILD ANESTHETIC PROPERTIES OF SULFUR HEXAFLUORIDE

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Abstract
With 20 young adults as subjects comparisons of analgesic effects of 79% SF6 and 30% N2O were made, using the Wolff-Hardy-Goodel apparatus. Using a closed system, O2 was given until the N2 was removed, SF6 was slowly introduced until the O2 concn. reached 21%, and was then maintained at this level for 5 min. before measurements were taken. Similarly these same subjects breathed 30% N2O in O2, using the inhaler from an anesthetic machine equipped with a rotameter. A breathing period of 10 min. was allowed for equilibration before measurements were taken. Pain threshold elevation averaged 22% using 30% N2O and 19% using 79% SF6. Earliest subjective sensation occurred when the SF6 concn. reached 55% and included sleepiness, and deepening of the voice. Recovery from this drug was more rapid than from N2O.

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