Background: Functional capacity is an important component of risk assessment for major surgery. Doctors’ clinical
subjective assessment of patients’ functional capacity has uncertain accuracy. We did a study to compare preoperative
subjective assessment with alternative markers of ftness (cardiopulmonary exercise testing [CPET], scores on the
Duke Activity Status Index [DASI] questionnaire, and serum N-terminal pro-B-type natriuretic peptide [NT pro-BNP]
.concentrations) for predicting death or complications after major elective non-cardiac surgery.
 

lancet, June 2018