Postoperative respiratory complications may be due to mechanical, hemodynamic, or pharmacological factors related to surgery and anesthesia. The preoperative respiratory status and ventilatory reserves of the patient also play a large role in postoperative outcomes. In order to simplify diagnosis of respiratory problems and direct appropriate therapy, it is useful to categorize respiratory complications as being due to abnormalities of ventilation, arterial oxygenation, or airway patency and protection problems (Mecca 1992). Examples are provided in T.a,ble...,6..
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