text: （一）CO<sub>2</sub>的排出CO<sub>2</sub>极易从血液弥散到肺泡内，因此血中CO<sub>2</sub>的排出主要取决于进出肺内的气体总量，即每分肺泡通气量，其计算公式为：每分肺泡通气量=（潮气量-无效腔量）×RR无效腔量是指每次吸入潮气量中分布于气管内，不能进行气体交换的部分气体，因其相对恒定，故增加潮气量或RR，可增加每分肺泡通气量，促进CO<sub>2</sub>的排出，降低PaCO<sub>2</sub>，潮气量对CO<sub>2</sub>的影响大于RR。
entities.entity: 血液
entities.label: bod
entities.entity: 肺泡
entities.label: bod
entities.entity: 血
entities.label: bod
entities.entity: 肺
entities.label: bod
entities.entity: 肺泡通气量
entities.label: ite
entities.entity: 肺泡通气量
entities.label: ite
entities.entity: 潮气量
entities.label: ite
entities.entity: 无效腔量
entities.label: ite
entities.entity: RR
entities.label: ite
entities.entity: 无效腔量
entities.label: ite
entities.entity: 吸入潮气量
entities.label: ite
entities.entity: 气管
entities.label: bod
entities.entity: 潮气量
entities.label: ite
entities.entity: RR
entities.label: ite
entities.entity: 肺泡通气量
entities.label: ite
entities.entity: 潮气量
entities.label: ite
entities.entity: RR
entities.label: ite