Seasonal Variation in Stroke in the Hunter Region, Australia

Wang, Yang; Levi, Christopher; Attia, John; DʼEste, Catherine; Spratt, Neil J; Fisher, Janet

doi:10.1161/01.str.0000067703.71251.b6

Cited by 128 publications

(117 citation statements)

References 46 publications

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“…An earlier study from Japan reported that diurnal temperature change may affect daily blood pressure or autonomic nervous system balance, and, if a considerable diurnal temperature change induces considerable hemodynamic change, it may trigger cerebral stroke. 31 In addition, some studies reported stronger seasonality in stroke in older age groups than in younger ones, 10,11,32,33 as seen in our study. We found a September preponderance in the monthly incidence of AS and IS.…”

Section: 23-25supporting

confidence: 83%

“…Most studies have demonstrated that the incidence of stroke increases in the winter and spring and decreases in the summer and autumn. [3][4][5][6][7][8][9][10][11] However, some studies have reported increases in the incidence of stroke in response to dramatic temperature changes in the spring and autumn, [12][13][14] whereas in other studies, no seasonal variation has been demonstrated. [15][16][17] Because most previous studies have addressed large regions with varying climate, studies on smaller regions with similar weather and environments could provide important information on this topic.…”

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confidence: 99%

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Effect of Seasonal and Monthly Variation in Weather and Air Pollution Factors on Stroke Incidence in Seoul, Korea

Han

Kim

et al. 2015

Stroke

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Background and Purpose-The purpose of the present study was to determine whether seasonal and monthly variations in stroke incidence exist and whether they are related to meteorologic and air pollution parameters under similar weather and environmental conditions in selected areas of Seongdong district, Seoul, South Korea. Methods-From January 1, 2004, to December 31, 2013, 3001 consecutive stroke events were registered in residents of selected areas of Seongdong district, Seoul, South Korea. The authors calculated the stroke attack rate per 100 000 people per month and the relative risk of stroke incidence associated with meteorologic and air pollution parameters. We also analyzed odds ratios with a 95% confidence interval for seasonal and monthly stroke incidence. Results-The incidence of stroke in September was significantly higher (odds ratio, 1.233; 95% confidence interval, 1.042-1.468) compared with January. The seasonal ischemic stroke incidence in summer (odds ratio, 1.183; 95% confidence interval, 1.056-1.345) was significantly higher than in winter, whereas the seasonal incidence of intracerebral hemorrhage relative to winter was not significant. The mean temperature was positively correlated with ischemic stroke (relative risk, 1.006; P=0.003), and nitrogen dioxide (relative risk, 1.262; P=0.001) showed a strong positive correlation with intracerebral hemorrhage incidence among the older age group. Conclusions-We demonstrated distinct patterns of seasonal and monthly variation in the incidence of stroke and its subtypes through consideration of the meteorologic and air pollution parameters. We therefore expect that these findings may enhance our understanding of the relationships between stroke and weather and pollutants.

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Section: 23-25supporting

confidence: 83%

mentioning

confidence: 99%

Effect of Seasonal and Monthly Variation in Weather and Air Pollution Factors on Stroke Incidence in Seoul, Korea

Han

Kim

et al. 2015

Stroke

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“…As mentioned before, different patterns of incidence were reported for each geographical region in different studies. In some studies, no significant relationship was observed between the incidence of stroke and season of the year (24,25), but in some countries, winter (29,30) or summer (21,31,32) were introduced as the risk factor for stroke. However, a study in New Zealand found that strokes were less likely to occur during the summer and autumn than in the winter or spring (33).…”

Section: Discussionmentioning

confidence: 99%

“…According to the statistical information in Italy, the incidence of stroke is lower during the summer and is higher in the fall than in the winter (20). But, in some regions of Australia, more stroke rate is reported in the summer than in the winter (21). In Finland, the rate of cerebral-vascular attacks in men is higher on Mondays than on Sundays (22) and also another study revealed that the peak of vascular attacks is in the early hours of the morning, and then the attacks' rate reduces in the rest hours of the day (23).…”

Section: Introductionmentioning

confidence: 99%

Circadian Variation in the Incidence of Stroke-Induced Aphasia Types in Ahvaz, South-West of Iran

Zamani

Mousavi

Rezai

et al. 2015

Jentashapir J Health Res

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Background: The incidence of the stroke and its associated disorders has a multifactorial nature. Nowadays, researchers are looking for the relationship between circadian variations and the stroke incidence. Objectives: The current study aimed to compare the incidence of the different types of stroke-induced aphasia in Ahvaz, Iran, on seasonal, diurnal (weekly), and circadian variations. Patients and Methods:In this retrospective hospital-based study, the medical records of 1817 patients with stroke were reread in Ahvaz hospitals in 2011. Types of aphasia were diagnosed based on speech and language symptoms in their records. The data were transferred into the SPSS version 16, for statistical comparison. Results: According to the obtained results 39.9% of the studied patients had a stroke-induced aphasia. The highest incidence rates of aphasia due to the stroke in Ahvaz were, in the summer (38.2%), on Saturdays (16.1%), and 21.1% between 8:00 AM to noon. Chi-square test indicated a significant difference between the mentioned times and other time (P < 0.05). Conclusions: It seems that the incidence of different types of stroke-induced aphasia in Ahvaz is influenced by the calendar-temporal changes. According to the findings, to prevent the occurrence of stroke-induced aphasia, necessary counseling should be provided for lifestyle changes.

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“…Palavras-chave: acidente vascular cerebral, temperatura, risco cardiovascular, sazonal. The correlation between strokes and seasonal variations have been studied in various places [1][2][3][4][5][6][7][8] . Some studies around the world have reported an increase of incidence, mortality, and stroke hospitalization during the coldest months of winter.…”

mentioning

confidence: 99%

Temperature variation in the 24 hours before the initial symptoms of stroke

Coelho

Santos

Neto

et al. 2010

Arq. Neuro-Psiquiatr.

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A few studies have performed to evaluate the temperature variation influences over on the stroke rates in Brazil. Method: 176 medical records of inpatients were analyzed after having had a stroke between 2004 and 2006 at Hospital Israelita Albert Einstein. The temperature preceding the occurrence of the symptoms was recorded, as well as the temperature 6, 12 and 24 hours before the symptoms in 6 different weather substations, closest to their houses in São Paulo. results: Strokes occurred more frequently after a variation of 3ºC between 6 and 24 hours before the symptoms. There were most hospitalizations between 23-24ºC. conclusion: Incidence of stroke on these patients was increased after a variation of 3º Celsius within 24 hours before the ictus. The temperature variations could be an important factor in the occurrence of strokes in this population. Key words: stroke, temperature, cardiovascular risk, seasonal.Variação da temperatura nas 24 horas anteriores aos sintomas iniciais do acidente vascular cerebral resuMo Poucos trabalhos têm estudado a variação sazonal e de temperatura em acidente vascular cerebral (AVC) no Brasil. Método: Foram analisados 176 registros de pacientes com AVC no Hospital Israelita Albert Einstein entre 2004 e 2006. Foram anotadas as temperaturas ambientes do início dos sintomas, bem como as temperaturas de 6, 12 e 24 horas antes dos sintomas, em 6 diferentes subestações metereológicas mais próximas da casa do paciente em São Paulo. resultados: Houve aumento da incidência do AVC com a variação de 3ºC entre 6 e 24 horas antes do início dos sintomas. Houve um pico de internação entre 23-24ºC. conclusão: A variação de temperatura de 3ºC nas 24 horas que antecederam o início dos sintomas pode ter sido um fator importante na ocorrência do AVC. Palavras-chave: acidente vascular cerebral, temperatura, risco cardiovascular, sazonal. The correlation between strokes and seasonal variations have been studied in various places [1][2][3][4][5][6][7][8] . Some studies around the world have reported an increase of incidence, mortality, and stroke hospitalization during the coldest months of winter.The authors suggest that the temperature variations may trigger responses of vasoconstriction with increase in cardiovascular events. However, the understanding of the relation between changes of weather and cardiovascular events is limited 9-13 . The variation of temperatures before the occurrence of ictus has not been frequently observed. The change in temperature before a stroke could has play a more important role than the season it self. Authors show that the incidence of hemorrhagic stroke (HS) was higher on those days during which the temperature varied significantly 12 .

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Seasonal Variation in Stroke in the Hunter Region, Australia

Cited by 128 publications

References 46 publications

Effect of Seasonal and Monthly Variation in Weather and Air Pollution Factors on Stroke Incidence in Seoul, Korea

Effect of Seasonal and Monthly Variation in Weather and Air Pollution Factors on Stroke Incidence in Seoul, Korea

Circadian Variation in the Incidence of Stroke-Induced Aphasia Types in Ahvaz, South-West of Iran

Temperature variation in the 24 hours before the initial symptoms of stroke

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