Seasonal and Latitudinal Occurrence of Cerebral Vasospasm and Subarachnoid Hemorrhage in the Northern Hemisphere

Vinall, P.; Maislin, Greg; Michele, John J.; Deitch, Christopher; Simeone, Frederick A.

doi:10.1097/00001648-199405000-00008

Cited by 30 publications

(19 citation statements)

References 30 publications

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“…In con-Fischer/Johnsen/Pedersen/Gaist/Sørensen/ Rothman trast, other studies have reported a seasonal variation in the incidence of SAH hospitalization [12,18,29]. However, the peak-to-trough ratios were generally not strong [14,18], and the pattern of seasonal variation was not consistent in these studies. Although the nadir has consistently been found during the summer months, the highest incidence has been reported during the spring, autumn and winter months [12, 14-16, 18, 30].…”

Section: Discussionmentioning

confidence: 63%

“…Whereas some were community-and population-based registry studies, covering a defined geographical area and time period [4,16,19,31], other studies were hospital based, including only patients admitted to particular, mainly neurosurgical, departments [12,15,20,29]. A few studies included patients exclusively with aneurysmal SAH [12,14,20]. The studies from specialized departments or studies in differently selected subgroups of patients may have been influenced by referral bias, i.e., patients may have failed to reach the specialized department for various reasons: an incorrect diagnosis by the general practitioner or at the nonspecialized department, the patient may have died before reaching the specialized department or it was assumed that no treatment was possible [32].…”

Section: Discussionmentioning

confidence: 99%

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Seasonal Variation in Hospitalization and Case Fatality of Subarachnoid Hemorrhage – A Nationwide Danish Study on 9,367 Patients

et al. 2004

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Seasonal variation in the occurrence of cerebrovascular disease has been reported, but data about subarachnoid hemorrhage (SAH) are few and inconclusive. We conducted a nationwide population-based study in Denmark to examine any seasonal pattern of hospitalization and case fatality of SAH. We identified 9,367 patients with SAH and found a modest indication of overall seasonal variation for the risk of hospitalization with this diagnosis. The seasonal pattern, with the highest incidence in January and the nadir in July, was mostly apparent for subjects aged >65 years (peak-to-trough ratio = 1.18; 95% CI 1.04–1.32). There was little difference by sex. The overall 30-day case fatality rate was 38% and showed less seasonal variation. We found evidence of weak seasonal variation in hospitalization for SAH and almost no seasonal variation in a 30-day case fatality rate after SAH.

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Section: Discussionmentioning

confidence: 63%

Section: Discussionmentioning

confidence: 99%

Seasonal Variation in Hospitalization and Case Fatality of Subarachnoid Hemorrhage – A Nationwide Danish Study on 9,367 Patients

et al. 2004

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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: 99%

“…8,13) However, investigation of the seasonal incidence of SAH has identified environmental and sociomedical factors correlated with aneurysm rupture. 2,4,6,11,12,14,15,17,18,20,22,24,26,27,[29][30][31][32][33] The present study investigated the relationship between sex and seasonal occurrence of SAH.…”

Section: Introductionmentioning

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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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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“…Seasonal variation and meteorological association of stroke has long been controversial, but only a small number of studies have focused specifically on SAH, so whether such epidemiological phenomena exist has not been determined. Statistically significant seasonal or circannual cyclic trends have been reported [2][3][4]7,12,13,19,26,27) and some meteorological factors were significantly associated with the occurrence of SAH. 2,4,7,13,15) However, other studies have not found significant seasonal variation or meteorological association.…”

Section: Introductionmentioning

confidence: 96%

Differential Effects of Activity and Climate on Onset of Subarachnoid Hemorrhage.

Kawai

Nonaka

Suzuki

et al. 2001

Neurol. Med. Chir.(Tokyo)

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Conflicting findings of the effect of climate on onset of subarachnoid hemorrhage (SAH) may result from the influence of strenuous activities which can trigger aneurysmal rupture independent of climatological factors. The effect of climate and patient activities on onset of SAH were analyzed. The clinical records of 786 consecutive patients with aneurysmal SAH admitted to our hospital for 10 years were reviewed. Activities at onset were categorized according to the intensity of strain at onset. Seasonal variation, circannual cyclic trend, and association with 90 meteorological factors were examined in each category and the results were compared between categories. Bimonthly occurrence in the light strain group showed a significant seasonal variation and cyclic trend with two peaks in early spring and fall, whereas no significant trend was detected in the overall patients and in the heavy strain group. The significant meteorological factors were global solar radiation, sunshine hours, changes in mean and minimum temperature and mean vapor pressure from the previous day, and minimum pressure in the previous 7 days. Lower global solar radiation in the light strain group was associated with onset with the lowest p value (p ＝ 0.0046). No factors were significant in the heavy strain group. There is some evidence of the possible influence of climatological factors on onset of SAH without strenuous activity. Strenuous activity seems to affect onset more strongly, which masks any effect of climate.

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Seasonal and Latitudinal Occurrence of Cerebral Vasospasm and Subarachnoid Hemorrhage in the Northern Hemisphere

Cited by 30 publications

References 30 publications

Seasonal Variation in Hospitalization and Case Fatality of Subarachnoid Hemorrhage – A Nationwide Danish Study on 9,367 Patients

Seasonal Variation in Hospitalization and Case Fatality of Subarachnoid Hemorrhage – A Nationwide Danish Study on 9,367 Patients

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

Differential Effects of Activity and Climate on Onset of Subarachnoid Hemorrhage.

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