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Functional Capacity

A patient’s functional capacity or incapacity is a powerful predictor of postoperative cardiopulmonary^1-3 and neurocognitive⁴ complications. Exercise capacity is measured quantitatively in terms of metabolic equivalents (1MET = consumption of 3.5 mL O₂∙kg^-1∙min^-1 of body weight). To highlight the possible need for further evaluation, preoperative evaluation guidelines define poor exercise tolerance as ≤ 4 METS. Hence, to evaluate a patient’s preoperative functional capacity, one question to ask might be, “Can you climb a flight of stairs without stopping or becoming short of breath?” Table 3.1 provides examples of daily activities and their measured metabolic equivalencies.