Sarcopenia and stroke: poorer function and cognition, so assess muscle early

Design

Systematic review and meta-analysis of 36 cohort studies

Population

Stroke patients with and without sarcopenia

Primary outcome

Poor global functional prognosis on the modified Rankin Scale

Effect

OR 2.43 (95% CI 1.95 to 3.03); FIM-motor SMD -0.94 (-1.11 to -0.77)

A meta-analysis of 36 cohort studies examined sarcopenia and recovery after stroke. Sarcopenia was associated with higher odds of poor global functional outcome on the modified Rankin Scale (odds ratio 2.43, 95% CI 1.95 to 3.03), lower motor scores (standardised mean difference -0.94, -1.11 to -0.77) and lower cognitive scores (-0.95, -1.22 to -0.69). Swallowing dysfunction was more likely but not significantly (odds ratio 1.45, 0.94 to 2.25).

Heterogeneity came from differences in populations, modified Rankin Scale cut-offs, follow-up, stroke type and sarcopenia definition. Egger's test suggested publication bias, though trim-and-fill correction left the conclusions unchanged. The authors recommend sarcopenia screening in routine stroke assessment with individualised interventions for high-risk patients.

All the studies were observational, so sarcopenia may be a marker of frailty and severity rather than a cause of poor recovery, and the review does not show that treating it improves outcomes. Screening with a grip strength test or a simple screening questionnaire is feasible on a ward.

• Sarcopenia went with 2.4 times higher odds of poor functional outcome after stroke.
• Motor and cognitive scores were lower with sarcopenia.
• Swallowing dysfunction was not significantly raised.
• Studies were observational and showed publication bias.
• Screen for sarcopenia on stroke wards and involve dietitians and physiotherapists early.

Why it matters

A simple, cheap assessment may identify patients likely to need more rehabilitation.

Don't overread it

Observational studies with publication bias show an association with prognosis and cannot show that treating sarcopenia improves recovery.

The statistics, in plain English

An odds ratio of 2.43 compares odds of a poor outcome with and without sarcopenia, and is not adjusted in the same way across studies. Sarcopenic patients are also older and more often frail, which may explain part of the gap.

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