PMID: 15374025Sep 18, 2004Paper

Seasonal variation in the incidence of delirium among the patients of a geriatric hospital

Archives of Gerontology and Geriatrics
S BalanB Habot

Abstract

Delirium syndrome is common in the hospitalized elderly population. However, data on its numerous etiological factors are scarce. Clinical observations suggest that delirium incidence could be related to seasonality. In order to evaluate the seasonal influence on the incidence of delirium syndrome among the patients of a geriatric hospital, we performed a retrospective study reviewing the medical records of 5218 patients aged 65 years and older, who were hospitalized in three medical wards between the years 1991 and 1997. The diagnoses of delirium were made according to ICD-9-CM. Of the 4929 subjects enrolled, 3548 (72%) were referred for assessment to the psychiatric or neurologic specialist, because of acute changes in their mental or behavioral status. Of those patients, 312 (6.3%) were diagnosed with delirium at admission, and 234 (4.7%) developed delirium during their hospitalization. Statistical analysis of incidence revealed a seasonal variation, with higher rates in the winter than in the summer months (P<0.001). This study suggests a seasonal influence on delirium syndrome incidence and a possible etiological relation with seasonal factors like the light -dark cycle.

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Citations

Jan 14, 2010·Thoracic Surgery Clinics·Anita S BagriJorge G Ruiz
Nov 6, 2008·Clinics in Geriatric Medicine·Anita S BagriJorge G Ruiz
Jan 30, 2014·AORN Journal·Paula BrooksEileen Stuart-Shor
Mar 29, 2013·Critical Care Medicine·Rachel KohnScott D Halpern
Feb 6, 2017·Sleep Science·Manuel Ángeles-CastellanosCarolina Escobar
Mar 4, 2021·European Journal of Neurology : the Official Journal of the European Federation of Neurological Societies·Annerose MengelMaria-Ioanna Stefanou

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