因为正压通气会提高胸内压，减少静脉回流，进而减少心脑血液灌注。

Any form of positive-pressure ventilation is deleterious during cardiac arrest because the increase in intrathoracic pressure decreases venous return to the heart and perfusion of the heart and brain.

youdao

因为正压通气会提高胸内压，减少静脉回流，进而减少心脑血液灌注。

Any form of positive-pressure ventilation is deleterious during cardiac arrest because the increase in intrathoracic pressure decreases venous return to the heart and perfusion of the heart and brain.

youdao