Table 2.

ETCO₂ and PbtO₂ (mmHg, mean ± SD) during hyperventilation therapy in the condition of mild hypothermia

Range of ETCO2 (mmHg)	Value of ICP dropout (mmHg)	Ratio of low PbtO2 (%)
25–29	6.97±1.54	28.3
30–34	3.84±1.17*	25.7
35–44	–	15.8
>44	–	5.1

Note:

^*Compared with ETCO₂ 25–29 mmHg, P<0.05.

Abbreviations: ETCO₂, end-tidal carbon dioxide pressure; PbtO₂, brain tissue partial pressure of oxygen; ICP, intracranial pressure.