title: Seasonal variation in occurrence of ischemic colitis: a retrospective study.
abstract: Objectives We aimed to identify the clinical characteristics of ischemic colitis (IC) and to investigate the occurrence of seasonal variation. Methods From January 2008 to December 2014, 368 had IC as the reason for their admission. A total of 364 patients were enrolled in this study. We investigated patient characteristics and seasonal variations in incidence. Results The mean age (±standard deviation) of patients with IC at diagnosis was 66.8 (±16.9) years. Most patients had abdominal pain (341 cases), hematochezia (337 cases), and diarrhea (199 cases) as their chief complaints. The clinical courses of the disease were classified as transient (294 cases), stricture (17 cases), gangrenous (2 cases), and indeterminate types (51 cases). Although IC tended to occur less frequently in winter, the seasonal difference was not significant. Conclusion There is currently no evidence for seasonal variation in hospital admissions for IC.
authors.affiliation: 1 Department of Gastroenterology, Shimane Prefectural Central Hospital, Izumo, Shimane, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Yamanouchi
authors.affiliation: 1 Department of Gastroenterology, Shimane Prefectural Central Hospital, Izumo, Shimane, Japan.
authors.forename: Sayaka
authors.initials: S
authors.lastname: Ogawa
authors.affiliation: 1 Department of Gastroenterology, Shimane Prefectural Central Hospital, Izumo, Shimane, Japan.
authors.forename: Ryusaku
authors.initials: R
authors.lastname: Kusunoki
authors.affiliation: 1 Department of Gastroenterology, Shimane Prefectural Central Hospital, Izumo, Shimane, Japan.
authors.forename: Youichi
authors.initials: Y
authors.lastname: Miyaoka
authors.affiliation: 1 Department of Gastroenterology, Shimane Prefectural Central Hospital, Izumo, Shimane, Japan.
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Fujishiro
authors.affiliation: 1 Department of Gastroenterology, Shimane Prefectural Central Hospital, Izumo, Shimane, Japan.
authors.forename: Naruaki
authors.initials: N
authors.lastname: Kohge
authors.affiliation: 2 Department of Gastroenterology and Hepatology, Shimane University School of Medicine, Izumo, Shimane, Japan.
authors.forename: Yoshikazu
authors.initials: Y
authors.lastname: Kinoshita
mesh_terms: D015746:Abdominal Pain / Q000503:physiopathology; D000368:Aged; D000369:Aged, 80 and over; D002940:Circadian Rhythm / Q000502:physiology; D017091:Colitis, Ischemic / Q000175:diagnosis* / Q000453:epidemiology* / Q000503:physiopathology; D003967:Diarrhea / Q000503:physiopathology; D005260:Female; D006471:Gastrointestinal Hemorrhage / Q000503:physiopathology; D006760:Hospitalization / Q000706:statistics & numerical data*; D006801:Humans; D015994:Incidence; D007564:Japan / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012621:Seasons
keywords: Ischemic colitis; constipation; diarrhea; season; weather