Changes in etiology and severity of dysphagia with aging.

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To investigate characteristics of dysphagia in the oldest-old population and the effect of aging on swallowing physiology. 418 (364 men, 54 women) patients who underwent videofluoroscopic swallow study (VFSS) for dysphagia were included. The patients were divided into an older group, group I (60-79years old, n = 275) and the oldest-old group, group II (80-96years old, n = 143). Sex, cognition, duration of symptoms, BMI (body mass index), frailty index derived from comprehensive geriatric assessment (FI-CGA), penetration aspiration scale (PAS), and videofluoroscopic dysphagia scale (VDS) scores and the etiologies of dysphagia were compared between the groups. The correlation analysis of BMI and FI-CGA with dysphagia severity and age was performed. The proportion of males, K-MMSE scores, the duration of symptoms, BMI scores and FI-CGA were significantly greater in group I than II. The PAS and VDS scores were significantly higher in group II than I. The proportion of CNS disorders was significantly higher in group I than in group II. The proportion of poor general medical condition was significantly higher in group II than in group I. A negative correlation between BMI and dysphagia severity and a positive correlation between FI-CGA and dysphagia severity were observed. Dysphagia tends to be more severe in the oldest-old, and can be caused by health conditions unrelated to swallowing. Malnutrition and frailty correlated positively with dysphagia severity, irrespective of age.