Temporal muscle thickness is associated with the severity of dysphagia in patients with acute stroke

•We assessed the relationship between temporal muscle thickness (TMT) and dysphagia•TMT was an independent risk factor for dysphagia in acute stroke patients•Head MRI measurements of TMT are useful for assessing skeletal muscle loss Post-stroke dysphagia is a common and expensive complication of acute stroke. The relationship between dysphagia and skeletal muscle loss (sarcopenia) has been recently highlighted. This study aimed to determine the relationship between temporal muscle thickness (TMT) measured by head magnetic resonance imaging (MRI) and dysphagia in patients with acute stroke. Seventy participants (43 men and 27 women; mean age, 75.6 ± 12.7 years) were included in this study. TMT was measured by T2-magnetic resonance images within seven days of hospitalization. The severity of dysphagia was assessed using the Functional Oral Intake Scale (FOIS). Participants were classified into three categories according to the severity of dysphagia (severe: FOIS score, 1–3; mild: FOIS score, 4–6; normal: FOIS score, 7). Linear regression analysis was used to determine the independent explanators of dysphagia severity. Twenty participants (28.6%) had severe dysphagia, 31 participants (44.3%) had mild dysphagia, and 19 participants (27.1%) had normal swallowing function at discharge. The results of the linear regression analysis showed that TMT was a significant explanator of dysphagia severity following stroke, along with age and National Institute of Health Stroke Scale (NIHSS) score (P < 0.05, effect size: f2 = 0.72). TMT was an independent risk factor for dysphagia in patients with acute stroke. Skeletal muscle loss may be secondarily involved in dysphagia with acute stroke, and measurement of TMT with head MRI is a useful method to assess skeletal muscle loss.