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题64: e(注解)在换气不全状态时,动脉血中碳酸气分压上升,如果再有促其上升的其他因素,则可导致CO_2麻醉.有郁血性心功能不全必然引起肺循环障碍,导致肺泡的血气交换障碍,成为CO_2麻醉的诱因.在严重哮喘发作状态,呼气吸气均障碍,动脉血中的氧分压下降,碳酸气分压上升,因此,也是CO_2麻醉的诱因.在呼吸器官感染,肺的血气交换障碍,是当然的诱因.在肺功能不全,因血中CO_2持续上升,呼吸中枢对CO_2的感受性下降,呼吸通过缺氧性驱力(anoxic drive)来维持,因此,如吸入高浓度的氧气,则使由于缺氧症而起的呼吸中枢兴奋受到抑制,引起呼吸抑制,使血中CO_2更加升高,最终导致CO_2麻醉.故慢性换气不全的患者,严禁随便吸入氧气.题65: e(注解)SMON最易受损的部位是周围
Problem 64: e (Note) In partial hypoventilation, partial pressure of carbon dioxide in the arterial blood increases, if there are other factors that promote its rise, it can lead to CO_2 anesthesia.Caused ventricular insufficiency will inevitably lead to pulmonary circulatory disorders, Leading to alveolar blood gas exchange obstacles, as a cause of CO_2 anesthesia in severe asthma attack state, expiratory dyspnea, arterial partial pressure of oxygen decreased, carbon dioxide partial pressure rise, therefore, is also CO_2 anesthesia incentives in Respiratory organ infection, pulmonary blood gas exchange disorders, of course, is the incentive.In the lung insufficiency, as blood CO 2 continued to rise, the respiratory center of CO 2 decreased sensitivity, respiratory hypoxia drive (anoxic drive) to maintain, therefore , Such as the inhalation of high concentrations of oxygen, the hypoxia caused by respiratory center excitement is inhibited, causing respiratory depression, the blood CO 2 increased, eventually leading to CO_2 anesthesia. Therefore, patients with chronic hypoventilation, is strictly prohibited Inhale oxygen Question 65: e (note) The most vulnerable parts of SMON are the surroundings