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.

• 在心脏停跳期间，任何形式的正压通气都是有害的。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。