Seasonal variation of stroke occurrence: a hospital based-study

Abstract

Introduction. Cerebrovascular events are not randomly distributed over time. In addition to the better known circadian variation, a seasonal variation in stroke occurrence is described in different reports. The aim of our study was to investigate whether stroke with its types follows a seasonal occurrence pattern in the Cluj-Napoca area. Materials and method. The stroke event data were collected from the patient records of a consecutive series of 1083 patients admitted through the Emergency Room to the Neurology Departments I and II of the County Hospital Cluj-Napoca, between 1 January 2012 and 31 December 2012. The diagnosis of ischemic stroke, intracerebral hemorrhage and subarachnoid hemorrhage was confirmed by neurologic examination and neuroimaging, according to updated World Health Organization criteria. The onset time was assigned to one of the four seasons: spring (March to May), summer (June to August), autumn (September to November) and winter (December to February). Statistical analysis was performed using Excel Microsoft. Results. All three types of stroke (ischemic stroke, intracerebral hemorrhage and subarachnoid hemorrhage) showed a seasonal variation in their occurrence, with two peaks in the winter and in the summer. Conclusion. The knowledge of the seasonal variation pattern of stroke occurrence could provide a basis for preventive and therapeutic strategies in cerebrovascular pathology.

The influence of circadian variation in ischemic stroke onset on the evolution of the severity of the clinical picture and disability

“…Over the past years, interest has increased in the study of chronobiological aspects involved in health maintenance as well as in the development of various diseases. The study of the temporal variation in the incidence of cerebrovascular pathology is part of this interest (1)(2)(3)(4). Ischemic stroke describes a circadian variation pattern with the highest incidence in the morning, according to most literature reports (5)(6)(7)(8)(9).…”

The circaseptan variation of stroke onset – a hospital-based study

“…The socio-professional particularities of women in the Romanian society involve duties and an intense rhythm of work during the weekend as well, which can explain the more pronounced tendency to cerebrovascular events in this time interval, contrary to some literature data, which describe a weekend peak more expressed in men and a Thursday-Friday peak in women, for example in the Japanese society [4,9]. In the literature, circaseptan variation has been little studied and the results are different.…”

“…However, the study of the weekly variation in ischemic stroke occurrence by age groups reveals some differences (Figs. [3][4][5], and there are also differences in the weekly frequency of the three types of stroke depending on sex ( Fig. 6).…”

“…The temporal variation of cerebrovascular events includes, in addition to circadian and seasonal variation (more extensively studied), weekly or circaseptan variation, mainly correlated with changes in psychophysiological stress linked to the transition from intense activity periods to relaxation periods and vice versa [1][2][3][4][5]. The weekly cycle does not belong to terrestrial rhythms, but is a conventional rhythm.…”

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