Is There a Temporal Pattern in the Occurrence of Subarachnoid Hemorrhage in the Southern Hemisphere?

Feigin, Valery L.; Anderson, Craig S.; Anderson, Neil E.; Broad, Joanna; Pledger, Megan; Bonita, Ruth

doi:10.1161/01.str.32.3.613

Cited by 50 publications

(42 citation statements)

References 58 publications

(29 reference statements)

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“…2,4,6,11,12,14,15,17,18,20,22,24,26,27,[29][30][31][32][33] Hospital-based and populationbased studies that demonstrated significant seasonal variation found that the peak period for SAH differed widely. [4][5][6]15,20,24,26,32,33) No statistically significant seasonal variations were also observed in some studies. 2,12,14,17,22,27,[29][30][31] The highest occurrences of SAH were found in spring in women and in late fall in men, 4) in spring and fall in men, and in winter in women, 24) and in winter in women and no peak in men.…”

Section: Discussionmentioning

confidence: 82%

“…32) Our data resembled the results of 10 years of the Canadian Collaborative Study Group although the lowest occurrence in their male group was in summer whereas that of in the present study was in winter. 24) This inconsistency and inconclusiveness can be explained by differences in study, hospital-based studies versus population-based studies, by differences in environmental conditions and lifestyle between the countries, 5) and by relatively small numbers of events available for analysis. The hospital-based data have selection bias of patients because they do not include a substantial proportion of patients who died from SAH before reaching the hospital.…”

Section: Discussionmentioning

confidence: 99%

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Involvement of Meteorological Factors and Sex in the Occurrence of Subarachnoid Hemorrhage in Japan

Umemura

Hirashima

Kurimoto

et al. 2008

Neurol. Med. Chir.(Tokyo)

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The sex difference in the seasonal occurrence of subarachnoid hemorrhage (SAH) and the association of meteorological factors in Japan were analyzed in 1006 consecutive patients with SAH in Toyama, Japan from 1996 to 2000. The study investigated whether these meteorological factors could explain the seasonality of the incidence of SAH in each sex. Seasonal variation of SAH occurrence peaked in spring in men, but peaked in spring and winter in women. The difference between maximum temperature and minimum temperature was the greatest on the day previous to SAH occurrence in multiple individuals in men, whereas mean humidity was the greatest on that day in women. Interestingly, the difference between maximum temperature and minimum temperature peaked in spring and mean humidity in winter from the meteorological data over the 5 years. The relationship between humidity and occurrence of SAH may explain the sex difference of the incidence of aneurysmal SAH. The humidity change may be a specific and additional meteorological factor for the incidence of SAH in women.

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Section: Discussionmentioning

confidence: 82%

Section: Discussionmentioning

confidence: 99%

Involvement of Meteorological Factors and Sex in the Occurrence of Subarachnoid Hemorrhage in Japan

Umemura

Hirashima

Kurimoto

et al. 2008

Neurol. Med. Chir.(Tokyo)

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“…Normal pressure was considered as SBP ≤140 mmHg and DBP ≤90 mmHg, and all measurements were done in the same place and by the same examiner (G.C.) in order to minimize physiological and psychological influences [6,[12][13][14][15][16][17]. Follow-up visits were arranged at 3-month intervals during a 5-year period.…”

Section: Methodsmentioning

confidence: 99%

“…There is evidence that BP differs with various geographical areas and that it is lower in tropical climates compared to continental climates [12]. The aim of this study was to investigate AP and related long-term variations in BP as well as its related complications in patients with HTN.…”

Section: Introductionmentioning

confidence: 98%

“…The specific cause of seasonal variation is not clear: one possibility that has been put forward is an inverse relationship between BP and the ambient temperature [1]. According to some studies, more deaths occur in winter than in summer, with most of them being due to cardiovascular and cerebrovascular events among the elderly [6,[11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Whether Atmospheric Pressure Changes Predict Variations in Blood Pressure

2017

JCCR

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Objective: The variations in blood pressure (BP) related to atmospheric pressure (AP) and the variables of age, gender and body mass index (BMI) in patients with essential hypertension (HTN) have not been studied in depth. This prospective 5-year study was conducted to assess the association between AP and blood pressure (BP) recorded in conditions of changing APs in the same room temperature.Methods: BP was measured during routine follow-up visits of 182 hypertensive patients (102men and 80women; age range 65-92 years) in an outpatient clinic with constant room temperature and APs that varied according to climate changes. Results Conclusion:The findings of this study demonstrated a direct relationship between AP above 1016 millibars and both SBP and DBP in HTN patients. Significant changes of the BP related to age (65-69 years and 70-75 years) and BMI (21-25 and 25-30) were found at AP differences between 1007 and 1024 millibars.

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The Genetics of Cerebral Aneurysms and Other Vascular Malformations

Fugate

Brown

2012

Stroke Genetics

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Is There a Temporal Pattern in the Occurrence of Subarachnoid Hemorrhage in the Southern Hemisphere?

Cited by 50 publications

References 58 publications

Involvement of Meteorological Factors and Sex in the Occurrence of Subarachnoid Hemorrhage in Japan

Involvement of Meteorological Factors and Sex in the Occurrence of Subarachnoid Hemorrhage in Japan

Whether Atmospheric Pressure Changes Predict Variations in Blood Pressure

The Genetics of Cerebral Aneurysms and Other Vascular Malformations

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