Association of occurrence of aneurysmal bleeding with meteorologic variations in the north of France.

Lejeune, Jean‐Paul; Vinchon, Matthieu; Amouyel, Philippe; Escartin, Terenz; Escartin, D; Christiaens, Jenneke

doi:10.1161/01.str.25.2.338

Cited by 90 publications

(83 citation statements)

References 9 publications

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“…A previous multivariate analysis of various climate factors found that shorter sunshine duration was significantly associated with occurrence of SAH and showed the lowest p value. 13) Although we did not perform multivariate analysis due to the strong mutual association of many climate factors, 26) the amount of global solar radiation was smaller on the onset days with the lowest p value in our study as well (Table 4).…”

Section: Discussionmentioning

confidence: 62%

“…Thus, a larger change of those meteorological factors may underlie the prevalence of SAH in spring and fall, although we did not find any trend showing that the mean value of these factors for 10 years were larger in spring and fall (data not shown). Some previous studies found that lower temperature on the onset day was significant, 4,13,15) but winter was generally not a peak season (Table 5). How much outdoor temperature affects aneurysmal rupture is unclear since most onsets occurred indoors (Table 2).…”

Section: Discussionmentioning

confidence: 88%

“…Other studies found that lower global solar radiation, lower sunshine hours, decrease in mean and minimum temperature from the previous day, and decrease in mean vapor pressure from the previous day were significantly associated with SAH. 2,7,11,13) How these meteorological factors affect biological factors, and which biological factors lead to aneurysmal rupture are unclear. Low temperature is known to increase blood pressure 2,4) but lower temperature is not always associated with onset of SAH.…”

Section: Discussionmentioning

confidence: 99%

“…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%

“…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. 1,10,14,[22][23][24] Interpretation of such results is complicated by the multiple factors associated with the design of each study, including the number of patients studied, criteria for patient selection (based on onset, admission, surgical treatment, or death), method of sampling (community-based or hospital-based), and the statistical method used for the analysis.…”

Section: Introductionmentioning

confidence: 96%

See 4 more Smart Citations

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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Section: Discussionmentioning

confidence: 62%

Section: Discussionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 96%

See 3 more Smart Citations

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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Circadian fluctuations in onset of perimesencephalic hemorrhage

et al. 2013

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Aneurysmal subarachnoid hemorrhage (aSAH) occurs more often during working hours and in the evening, and thus at times of relatively high blood pressure, with an even distribution over the days of the week in most studies. Perimesencephalic hemorrhage (PMH) is a non-aneurysmal subset of subarachnoid hemorrhage (SAH) without known circadian fluctuation. We studied the time and day of onset in a large series of patients with PMH. For all 249 PMH patients included in our SAH-database we analyzed the time (categorized in 2- and 6-h intervals) and day of onset by calculating rate ratios (RRs) with corresponding 95 % confidence intervals (CIs) for time and day, with the afternoon and Saturday as reference. The risk of PMH was lower between 2-4 AM (RR 0.14; 95 % CI 0.03-0.63), 4-6 AM (RR 0.21; 95 % CI 0.06-0.75) and 6-8 AM (RR 0.07; 95 % CI 0.01-0.54). A tendency towards higher risks in the morning and afternoon was observed. Analyzing the time of onset in 6-h intervals also showed a lower risk (RR 0.35; 95 % CI 0.21-0.58) during night hours (12-6 AM). The risk of PMH was evenly distributed over the days of the week. PMH occurs less often during night hours. The pattern of PMH during the day shows similarities to that seen in aSAH, although the differences over the day are not statistically significant, as they are in aSAH. The occurrence of PMH is evenly distributed over the days of the week, as it is in aSAH.

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Influence of weather on emergency transport events coded as stroke: population-based study in Japan

et al. 2005

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Studying the relation between incidence of stroke and weather is difficult because it requires large-scale community-based data collection. Despite the lack of strong evidence that weather conditions influence stroke incidence, many clinicians feel that meteorological conditions influence the onset of stroke. This study examined whether emergency events related to stroke are influenced by meteorological factors and was based on computerized records of emergency medical transport services in a Japanese city during the period January 1992-December 2003. A total of 53,585 patients transported for an event coded as stroke were analyzed in relation to meteorological factors such as temperature, humidity, and barometric pressure. Poisson regression analysis was applied to clarify the influence of daily meteorological conditions on the daily incidence of emergency transport due to events coded as stroke. Ordinary least squares regression analysis was used to evaluate the influence of weather, defined as the combination of meteorological parameters, on the occurrence of emergency transport due to events coded as stroke. Daily mean ambient temperature and daily mean relative humidity showed a statistically significant negative effect on the incidence of the emergency transport events for both men and women (P<0.001). Daily mean barometric pressure was not significantly related to these events. The occurrence of a holiday was negatively related to the incidence (P<0.001). Dry weather and cool weather were likely to shift the circadian curve of the incidence upward. Thus, occurrence of emergency transport due to events coded as stroke is likely to be associated with weather conditions.

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Association of occurrence of aneurysmal bleeding with meteorologic variations in the north of France.

Cited by 90 publications

References 9 publications

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

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

Circadian fluctuations in onset of perimesencephalic hemorrhage

Influence of weather on emergency transport events coded as stroke: population-based study in Japan

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