Seasonal variation of cerebrovascular diseases - Semantic Scholar
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Seasonal variation of cerebrovascular diseases - Semantic Scholar
vascular disease within the West Midlands Region was examined between the years ..... Support from the University of Birmingham and the West Mid-.
:Acta N6urochlrurgica
Acta Neurochir (Wien) (1991) 11 l: 80-83
9 Springer-Verlag 1991 Printed in Austria
Seasonal Variation of Cerebrovascular Diseases S. A. Tsementzis, R. P. Kennet, E.R. Hitchcock, J. S. Gill l, and D. G. Beevers 1 University Department of Neurosurgery, Midland Centre for Neurosurgery and Neurology and ~University Department of Medicine, Dudley Road Hospital, Birmingham, England
Summary The seasonal variation in all admissions of all types of cerebrovascular disease within the West Midlands Region was examined between the years 1973-1980. There was a fluctuation for both sexes with a peak in winter, between the months of October and April; a trough was observed in late summer, in July and August. Multivariate analysis of the meteorological factors showed an association between hours of sunshine and intracerebral haemorrhage. The meteorological variables were strongly correlated with each other making the selection of the most predictable variable to stroke difficult.
Introduction Previous studies of cerebrovascular disease (CVD) have demonstrated a seasonal variation in the incidence of general practice consulations7, hospital admissions3'
8 and in mortality3' 4, 13. This seasonal fluctuation was not confirmed for mortality from CVD by Alter et al.1 or for death occurring acutely after intracerebral or subarachnoid haemorrhage 12. The present study was performed to examine the possible seasonal variation in hospital admission for the various different categories of cerebrovascular disease and to investigate the causes for such fluctuation. Methods A retrospective analysis was performed of all admissions within the West Midlands Region for cerebrovascular disease between the years 1973 and 1980. The group studied as a whole and in the subdivisions provided by the International Classification of Diseases (ICD) 5. These were Subarachnoid haemorrhage (ICD 430), Intracerebral haemorrhage (ICD431) and Cerebral thrombosis (ICD 434). The total number of events was divided by 12 (the number
Table 1. Monthly Admissions of all Types of Cerebrovascular Disease Within the West Midlands Region Between the Years 1973-1980 All CVD (ICD 430-431-434)
SAH (430)
Haematoma (431)
Infarction (434)
Other (432-433)
Male
Female
Male
Female
Male
Female
Male
Female
Male
Female
January February March April May June July August September October November December
