PMID: 9451490Feb 6, 1998Paper

Heat production from reaction of inhalation anesthetics with dry soda lime

Der Anaesthesist
H WissingR Dudziak

Abstract

There are some case reports about excessive heat production in the absorbent canister when sevoflurane or enflurane are washed into a circle containing dried soda lime. This observation was often made in the DRAGER ISO 8 circle system with the gas inlet upstream of the soda lime canister with the gas-flow from bottom to top. The temperature in the center of an absorbent canister was measured 3.0 cm and 7.5 cm above the bottom. Soda lime (DRAGERSORB 800) was dried in an O2 stream for 2-3 days until there was no further loss in weight. 5 Vol% of desflurane, enflurane, isoflurane and sevoflurane in 2 1/min O2 or 4 Vol% of halothane in 2.5 I/min O2 were continuously fed into the canister. The concentration of the respective inhalational agents were measured after the soda lime canister using a DATEX Capnomac. Experiments were performed at ambient temperatures of 20-22 degrees C. A considerable temperature increase was achieved with all anaesthetics. The highest temperatures were measured at the upper sensor with 56-58 degrees C for desflurane, 76-80 degrees C for enflurane and isoflurane, 84-88 degrees C for halothane and 126-130 degrees C for sevoflurane. IR-detection for some agents was considerably delayed or the time course ind...Continue Reading

Citations

May 6, 2006·Anaesthesia·M J CoppensM M R F Struys
Jul 28, 2001·Anesthesia and Analgesia·E KnolleH Gilly
Oct 3, 2006·Current Opinion in Anaesthesiology·D H BremerichM Behne
Feb 25, 2003·Anesthesia and Analgesia·Elena J HolakHarvey J Woehlck
May 25, 2002·Acta Anaesthesiologica Scandinavica·H H Luttropp, A Johansson

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