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Observational Study
. 2021 Oct 1;49(10):1726-1738.
doi: 10.1097/CCM.0000000000005089.

Functional Outcomes and Their Association With Physical Performance in Mechanically Ventilated Coronavirus Disease 2019 Survivors at 3 Months Following Hospital Discharge: A Cohort Study

Affiliations
Observational Study

Functional Outcomes and Their Association With Physical Performance in Mechanically Ventilated Coronavirus Disease 2019 Survivors at 3 Months Following Hospital Discharge: A Cohort Study

Rob J J van Gassel et al. Crit Care Med. .

Abstract

Objectives: We performed a comprehensive health assessment in mechanically ventilated coronavirus disease 2019 survivors to assess the impact of respiratory and skeletal muscle injury sustained during ICU stay on physical performance at 3 months following hospital discharge.

Design: Preregistered prospective observational cohort study.

Setting: University hospital ICU.

Patients: All mechanically ventilated coronavirus disease 2019 patients admitted to our ICU during the first European pandemic wave.

Measurements and main results: At 3 months after hospital discharge, 46 survivors underwent a comprehensive physical assessment (6-min walking distance, Medical Research Council sum score and handgrip strength), a full pulmonary function test, and a chest CT scan which was used to analyze skeletal muscle architecture. In addition, patient-reported outcomes measures were collected. Physical performance assessed by 6-minute walking distance was below 80% of predicted in 48% of patients. Patients with impaired physical performance had more muscle weakness (Medical Research Council sum score 53 [51-56] vs 59 [56-60]; p < 0.001), lower lung diffusing capacity (54% [44-66%] vs 68% of predicted [61-72% of predicted]; p = 0.002), and higher intermuscular adipose tissue area (p = 0.037). Reduced lung diffusing capacity and increased intermuscular adipose tissue were independently associated with physical performance.

Conclusions: Physical disability is common at 3 months in severe coronavirus disease 2019 survivors. Lung diffusing capacity and intermuscular adipose tissue assessed on CT were independently associated with walking distance, suggesting a key role for pulmonary function and muscle quality in functional disability.

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Conflict of interest statement

Dr. Posthuma received funding from Medtalk Health. The remaining authors have disclosed that they do not have any potential conflicts of interest.

Figures

Figure 1.
Figure 1.
CT-derived skeletal muscle analysis at the 12th thoracic vertebrae level, showing skeletal muscle area and intermuscular adipose tissue surrounding erector spinae muscle. Top row shows high-resolution CT slices of three patients without tissue marking and bottom row shows the same slices with tissue marking in order of increasing intermuscular adipose tissue area.

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