Acute gastrointestinal bleeding cases presenting to the emergency department are associated with age, sex and seasonal and circadian factors.

Background Gastrointestinal bleeding (GIB) is one of the most common emergencies in gastroenterology. The aim of this study was to investigate the association between the incidence of GIB and seasonal, circadian and meteorological patterns in the emergency department (ED) of a tertiary hospital. Patients and methods From January 2007 until December 2012, we retrospectively evaluated patients presenting to the ED with respect to the number and location of GIB, season, time of day and weather. Results Of 45 458 patients, 578 (1.3%) presented with a GIB. Of these, 62.5% were men compared with 54.7% of all patients in the ED (chi(2), P = 0.0002). Patients with GIB were on average 4.4 years older than those without GIB (95% confidence interval 2.76-5.98, t-test, P < 0.001). In addition, 304 (52.6%) patients had upper GIB and 138 (23.9%) had lower GIB. In total, 136 (23.5%) patients required no endoscopy because of initial laboratory and circulatory stability. In univariate analysis, meteorological parameters, including air temperature, cloud cover, relative humidity, vapour pressure, amount of precipitation, sunshine duration and snow height, were each associated with an increased risk of acute GIB (all P-values < 0.05). In the 6-year study period, patients with GIB presented to the ED mainly during the winter months. Independent predictors of GIB on multivariate logistic regression were older age, male sex, season and daytime, all P less than 0.005. Emergency admissions during the night were associated with a 54 and 35% higher risk of GIB compared with daytime (8 a.m. to 4 p.m., P = 0.0002) and late evening hours (4 p.m. to midnight, P = 0.0142), respectively. Conclusion Presentation of patients with acute GIB in the ED is age and sex specific and shows seasonal and circadian differences in distribution, with an increased incidence in winter months and during night-time. This should be considered when determining possible emergency endoscopic interventions and the availability of emergency endoscopy services. Copyright (C) 2016 Wolters Kluwer Health, Inc. All rights reserved.