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Table 1 Carbon monoxide concentrations. Legend: Peak and median interquartile range carbon monoxide concentration [CO] in parts per million for each experiment: ex.1 = experiment 1, ex.2= experiment 2, both with desflurane 3.0 vol%, enflurane 0.6 vol%, isoflurane 0.6 vol%, halothane 0.45 vol% and sevoflurane 0.8 vol% in completely dry sodalime.

From: Carbon monoxide production from five volatile anesthetics in dry sodalime in a patient model: halothane and sevoflurane do produce carbon monoxide; temperature is a poor predictor of carbon monoxide production

Anesthetic vapor Peak [CO] ex.1 Peak [CO] ex.2 Median [CO] ex.1 Median [CO] ex.2
Desflurane 13889 14262 1809 (1092–5947) 1816 (1050–6378)
Enflurane 10187 10654 1485 (793–4490) 2044 (892–4394)
Isoflurane 2512 2382 588 (329–1430) 664 (329–1311)
Halothane 185 210 28 (0–92) 31 (0–94)
Sevoflurane 113 121 0 (0–36) 5 (0–43)