Alpha 2.0
Login Register
» Articles » PMID: 33767873

Snowfall Reduces the Risk of Chronic Subdural Hematoma Onset: Analysis of an Administrative Database in Japan

Overview
Journal Surg Neurol Int
Specialty Neurology
Date 2021 Mar 26
PMID 33767873
Authors
Kazunori Oda
Shotaro Aso
Yujiro Hattori
Fumio Yamaguchi
Hiroki Matsui
Kiyohide Fushimi
Hideo Yasunaga
Akio Morita
Affiliations
Soon will be listed here.
Abstract

Background: Chronic subdural hematoma (CSDH) is a frequently observed disease in neurosurgical practice. Although first snowfall has been considered to increase the onset of CSDH, few reports have assessed the relationship between snowfall and CSDH. In this study, we aimed to investigate the relationship between CSDH onset and first snowfall events.

Methods: This retrospective study was based on the Japanese Diagnosis Procedure Combination inpatient database from July 1, 2010, to March 31, 2016, and on the global observation of snowfall events in Japan obtained from the Japan Meteorological Agency. We used a binomial approximation to evaluate the average number of CSDH patients after first snowfall events compared with that before first snowfall events. We calculated the odds ratio of CSDH onset on the first snowfall.

Results: We identified 8526 CSDH patients from the database. A total of 5573 (65.4%) were observed before first snowfall events, and 2953 (34.6%) after first snowfall events. The first snowfall of winter was significantly associated with a reduction in the occurrence of CSDH (odds ratio, 0.53; 95% confidence interval; 0.51-0.55). In subgroup analysis, only the first snowfall in October was not associated with reduction in the occurrence of CSDH.

Conclusion: First snowfall events did not affect the onset of CSDH in Japan.

References
1.
Yang W, Huang J . Chronic Subdural Hematoma: Epidemiology and Natural History. Neurosurg Clin N Am. 2017; 28(2):205-210. DOI: 10.1016/j.nec.2016.11.002. View
2.
Ohno K, Suzuki R, Masaoka H, Matsushima Y, Inaba Y, Monma S . Chronic subdural haematoma preceded by persistent traumatic subdural fluid collection. J Neurol Neurosurg Psychiatry. 1987; 50(12):1694-7. PMC: 1032618. DOI: 10.1136/jnnp.50.12.1694. View
3.
Karibe H, Kameyama M, Kawase M, Hirano T, Kawaguchi T, Tominaga T . [Epidemiology of chronic subdural hematomas]. No Shinkei Geka. 2011; 39(12):1149-53. View
4.
Nathan S, Goodarzi Z, Jette N, Gallagher C, Holroyd-Leduc J . Anticoagulant and antiplatelet use in seniors with chronic subdural hematoma: Systematic review. Neurology. 2017; 88(20):1889-1893. DOI: 10.1212/WNL.0000000000003918. View
5.
Yamana H, Moriwaki M, Horiguchi H, Kodan M, Fushimi K, Yasunaga H . Validity of diagnoses, procedures, and laboratory data in Japanese administrative data. J Epidemiol. 2017; 27(10):476-482. PMC: 5602797. DOI: 10.1016/j.je.2016.09.009. View