Subphenotypic classification of COVID-19 survivors and response to telerehabilitation: a latent class analysis.
Yide Wang, Qianqian Xue, Zheng Li and 1 others
PMID 40143671WHAT IT FOUND
A 6-week home exercise app improved walking distance in COVID-19 survivors, but the benefit depended on lung function and steroid use.
Patients with poorer baseline lung function who had taken steroids saw the largest gains. Others showed no significant difference.
Key findings
01Latent class analysis identified two distinct phenotypes among the participants, with the primary difference being baseline pulmonary function.
02In patients who had received corticosteroids, those with poorer baseline lung function (Phenotype 1) showed significantly greater improvement in walking distance after the telerehabilitation intervention compared to those with better lung function.
03In patients who had not received corticosteroids, the telerehabilitation intervention improved walking distance significantly, but there was no difference in response between the two phenotypes.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
The study only included patients with moderate respiratory difficulty (grades 2–3) who had been hospitalized, so results do not apply to those with mild symptoms, severe symptoms, or those not hospitalized. Patients taking beta-blockers or bronchodilators were excluded, limiting generalizability to complex medical cases. The trial did not detail the types or doses of corticosteroids used, making it difficult to interpret the interaction between steroid history and rehabilitation response. Follow-up was limited to 24 weeks, which may not capture long-term recovery trajectories in long COVID. The classification into phenotypes was done post-hoc using latent class analysis, and the interaction findings rely on subgroup analyses which can be prone to chance findings.
Declared interests
The authors have no conflict of interest to declare.
The easy way to misread this
Do not assume that all COVID-19 survivors with breathing difficulties will respond equally to telerehabilitation. The significant benefit for the 'poor lung function' phenotype was only seen in the subgroup that had received corticosteroids. In patients without steroid history, the phenotype did not predict a different response. The study does not explain why this interaction exists.