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Seasonal variation of intracerebral haemorrhage in subjects with untreated hypertension

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Abstract:

Saloheimo P, Tetri S, Juvela S, Pyhtinen J, Hillbom M. Seasonal variation of intracerebral haemorrhage in subjects with untreated hypertension.

Acta Neurol Scand 2009: 120: 59–63.

© 2008 The Authors Journal compilation © 2008 Blackwell Munksgaard. Objectives – 

To explore the seasonality in the incidence of spontaneous intracerebral haemorrhage (ICH) in relation to the known risk factors in a population-based cohort. Materials and methods – 

All subjects with spontaneous ICH during a period of 3 years in Northern Ostrobothnia, Finland, were included. The associations of the risk factors for ICH with the cold (November to April) and warm (May to October) periods of the year were analysed. Results – 

We identified 217 patients with ICH during the study period. One hundred and seven cases occurred during the warm and 110 cases during the cold period. In multivariate analysis, untreated hypertension was associated with a 3.6-fold risk of ICH during the cold period (OR 3.60; 95% CI 1.27–10.21; P =0.016). Conclusions – 

An excess risk of ICH in subjects with untreated hypertension seems to be associated with the cold season. This is probably explained by the effect of ambient temperature on blood pressure.

Keywords: cerebral haemorrhage; hypertension; risk; seasons

Document Type: Research Article

DOI: https://doi.org/10.1111/j.1600-0404.2008.01125.x

Affiliations: 1: Department of Neurology, Oulu University Hospital, Oulu, Finland 2: Department of Neurosurgery, Oulu University Hospital, Oulu, Finland 3: Departments of Neurosurgery, Helsinki and Turku University Central Hospitals, Helsinki and Turku, Finland 4: Department of Diagnostic Radiology, Oulu University Hospital, Oulu, Finland

Publication date: 2009-07-01

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