The study aimed to investigate the status of thickener use in dysphagia patients with brain lesions and incidence of adverse events based on fluid viscosity. Twenty dysphagia patients with brain lesions who were recommended to use thickeners following a videofluoroscopic swallowing study were enrolled in this observational pilot study. Patients were educated to use thickener as level 2 or 3 based on the International Dysphagia Diet Standardization Initiative flow test. We evaluated the viscosity of the fluid that patients drank once a week for 2 weeks, and reviewed medical records regarding adverse events. Patients were divided into 2 groups based on the average value obtained from the viscosity evaluations as thin (Levels 0-2) and thick fluid groups (Levels 3-4). Adverse events were compared between the groups. The number of patients who did not follow the recommendations increased from 35.0 to 45.0% during the 1-week follow-up period. No patient developed pneumonia or urinary tract infection. Constipation (P = 0.338) and dehydration status (P = 0.202) were not significantly different between the 2 groups. In 2 evaluations for 20 patients, 40.0% of the cases did not follow the educated viscosity, and the number gradually increased in the follow-up evaluation. Considering that there were no significant differences in the incidence of adverse effects including pneumonia according to the fluid viscosity, a further study is necessary to establish detailed criteria for thickener use in dysphagia patients with brain lesions.
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