The 6-minute stepper test and the sit-to-stand test predict complications after major pulmonary resection via minimally invasive surgery: a prospective inception cohort study

<bold>Question:</bold> How well do the 6-minute stepper test (6MST) and sit-to-stand test (STST) predict complications after minimally invasive lung cancer resection? <bold>Design:</bold> Prospective inception cohort study with follow-up for 90 days. <bold>Participants:</bold> Consecutive sample of adults undergoing major lung resection with video-assisted thoracic surgery (VATS) or robot-assisted thoracic surgery (RATS). <bold>Outcome measures:</bold> Patients had a preoperative functional evaluation with the 6MST and STST. The number of steps, heart rate change, saturation and dyspnoea during the 6MST and the number of lifts during the STST were recorded. Complications graded ≥ 2 on the Clavien-Dindo classification were recorded for 90 days after surgery. <bold>Results:</bold> Between November 2018 and November 2019, 118 patients with a mean age of 65 years (SD 9) were included and analysed. Their surgeries were via VATS in 88 (75%) and via RATS in 30 (25%). For predicting a postoperative complication graded ≥ 2 on the Clavien-Dindo classification, the area under the Receiver Operating Characteristic curve was: 0.82 (95% CI 0.75 to 0.90) for the number of steps during the 6MST, with an optimum cut-off of 140 steps; and 0.85 (95% CI 0.77 to 0.93) for the number of lifts during the STST, with an optimum cut-off of 20 lifts. <bold>Conclusion:</bold> The 6MST and STST predicted morbidity and mortality after lung cancer resection via minimally invasive surgery. The preoperative use of these exercise tests in clinical practice may be useful for risk stratification