Aged patients may be hypoxemic during normal spontaneous ventilation postoperatively because of the mechanical changes of the aged lung and chest wall.

老年病人由肺和胸壁机械改变术后一般自主呼吸会生低氧血症。

As these patient are often hypoxemic and acidotic, respiratory alkalosis can be induced as a temporizing measure, until the drug of choice sodium bicarbonate (Class IIa) can be used.

低血压应该给，必要时给拟交感神经药（多巴胺或多巴酚丁胺）。