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Feasibility of Exercise Testing in Patients Who Are Critically Ill: A Prospective, Observational Multicenter Study

Published:August 22, 2018DOI:https://doi.org/10.1016/j.apmr.2018.07.430

      Abstract

      Objective

      To evaluate the feasibility and safety of exercise testing and to describe the physiological response to exercise of patients in the Intensive Care Unit (ICU).

      Design

      A prospective observational multicenter study.

      Setting

      Two mixed medical-surgical ICUs.

      Participants

      Patients (N=37; with no primary neurological disorders, 59% men; median age 50y; ICU length of stay 14.5d; Acute Physiology and Chronic Health Evaluation IV 73.0) who had been mechanically ventilated for more than 48 hours and were hemodynamically stable enough to perform physical exercise.

      Interventions

      A passive or active incremental exercise test, depending on muscle strength, on a bed-based cycle ergometer.

      Main Outcome Measures

      Feasibility and safety were evaluated based on protocol adherence and adverse events. Physiological responses to exercise quantified as changes in respiratory frequency (RF), oxygen uptake (Vo2), carbon dioxide output (Vco2), respiratory exchange ratio (RER), and blood lactate.

      Results

      Thirty-seven patients of whom 18 were mechanically ventilated underwent the exercise test. The active incremental test was performed by 28, and the passive test by 9 participants. Thirty-three (89%) accomplished the test according to the protocol and 1 moderate severe adverse event (bradycardia; heart rate 44) occurred shortly after the test. RF, Vo2, Vco2, and lactate increased significantly, whereas RER did not change during the active incremental exercise test. No changes were observed during the passive exercise test.

      Conclusions

      It is safe and feasible to perform exercise testing on a bed-based cycle ergometer in patients who are critically ill and a physiological response could be measured. Future research should investigate the clinical value of exercise testing in daily ICU practice and whether exercise capacity and its limiting factors could be determined by incremental exercise testing.

      Keywords

      List of abbreviations:

      ICU (intensive care unit), ICU-AW (intensive care unit–acquired weakness), IQR (interquartile range), MRC (Medical Research Council), O2 (oxygen), RER (respiratory exchange ratio), RF (respiratory frequency), RPM (revolutions per minute), SBP (systolic blood pressure), Spo2 (oxygen saturation), Vco2 (carbon dioxide output), Vo2 (oxygen uptake)
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