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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Isocapnic hyperpnea accelerates carbon monoxide elimination.

A major impediment to the use of hyperpnea in the treatment of CO poisoning is the development of hypocapnia or discomfort of CO2 inhalation. We examined the effect of nonrebreathing isocapnic hyperpnea on the rate of decrease of carboxyhemoglobin levels (COHb) in five pentobarbital-anesthetized ventilated dogs first exposed to CO and then ventilated with room air at normocapnia (control). They were then ventilated with 100% O2 at control ventilation, and at six times control ventilation without hypocapnia ("isocapnic hyperpnea") for at least 42 min at each ventilator setting. We measured blood gases and COHb. At control ventilation, the half-time for elimination of COHb (t1/2) was 212 +/- 17 min (mean +/- SD) on room air and 42 +/- 3 min on 100% O2. The t1/2 decreased to 18 +/- 2 min (p < 0.0005) during isocapnic hyperpnea. In two similarly prepared dogs treated with hyperbaric O2, the t1/2 were 20 and 28 min. We conclude that isocapnic hyperpnea more than doubles the rate of COHb elimination induced by normal ventilation with 100% O2. Isocapnic hyperpnea could improve the efficacy of the standard treatment of CO poisoning, 100% O2 at atmospheric or increased pressures.[1]


  1. Isocapnic hyperpnea accelerates carbon monoxide elimination. Fisher, J.A., Rucker, J., Sommer, L.Z., Vesely, A., Lavine, E., Greenwald, Y., Volgyesi, G., Fedorko, L., Iscoe, S. Am. J. Respir. Crit. Care Med. (1999) [Pubmed]
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