Journal
CANADIAN JOURNAL OF ANESTHESIA-JOURNAL CANADIEN D ANESTHESIE
Volume 68, Issue 4, Pages 514-529Publisher
SPRINGER
DOI: 10.1007/s12630-020-01909-9
Keywords
preoperative risk assessment; 6-minute walk test; postoperative complications; functional capacity
Categories
Funding
- Department of Anesthesiology and Pain Medicine at the University of Toronto
- International Anesthesia Research Society (IARS) Mentored Research Award
- Endowed Chair in Translational Anesthesiology Research at St. Michael's Hospital
- University of Toronto
- Australian National Health and Medical Research Council Practitioner Fellowship
- Canadian Institutes of Health Research
- Heart and Stroke Foundation of Canada
- Ontario Ministry of Health and Long-Term Care
- Ontario Ministry of Research, Innovation and Science
- United Kingdom (UK) National Institute of Academic Anaesthesia
- UK Clinical Research Collaboration
- Australian and New Zealand College of Anaesthetists
- Monash University (Melbourne, Victoria, Australia)
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The study found that preoperative 6MWT distance is modestly associated with moderate or severe complications after inpatient non-cardiac surgery, but not with myocardial injury or 30-day death. Further research is needed to determine the optimal role of the 6MWT in preoperative risk stratification.
Purpose The six-minute walk test (6MWT) is a simple and valid test for assessing cardiopulmonary fitness. Nevertheless, the relationship between preoperative 6MWT distance and postoperative complications is uncertain. We conducted a secondary analysis of the 6MWT nested cohort substudy of the Measurement of Exercise Tolerance before Surgery study to determine if 6MWT distance predicts postoperative complications or death. Methods This analysis included 545 adults (>= 40 yr) who were at elevated cardiac risk and had elective inpatient non-cardiac surgery at 15 hospitals in Canada, Australia, and New Zealand. Each participant performed a preoperative 6MWT and was followed for 30 days after surgery. The primary outcome was moderate or severe in-hospital complications. The secondary outcome was 30-day death or myocardial injury. Multivariable logistic regression modelling was used to characterize the adjusted association of 6MWT distance with these outcomes. Results Seven participants (1%) terminated their 6MWT sessions early because of lower limb pain, dyspnea, or dizziness. Eighty-one (15%) participants experienced moderate or severe complications and 69 (13%) experienced 30-day myocardial injury or death. Decreased 6MWT distance was associated with increased odds of moderate or severe complications (adjusted odds ratio, 1.32 per 100 m decrease; 95% confidence interval, 1.01 to 1.73; P = 0.045). There was no association of 6MWT distance with myocardial injury or 30-day death (non-linear association; P = 0.49). Conclusion Preoperative 6MWT distance had a modest association with moderate or severe complications after inpatient non-cardiac surgery. Further studies are needed to determine the optimal role of the 6MWT as an objective exercise test for informing preoperative risk stratification.
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