Relationship Between Outdoor Temperature And Blood Pressure

Halonen, Jaana I.; Zanobetti, Antonella; Vokonas, Pantel; Sparrow, David; Schwartz, Joel

doi:10.1164/ajrccm-conference.2010.181.1_meetingabstracts.a1727

Cited by 10 publications

(8 citation statements)

References 37 publications

(57 reference statements)

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“…Exposure to cold increases vasoconstriction and blood pressure, platelet count, cholesterol, heart rate, plasma fibrinogen, platelet viscosity and peripheral vasoconstriction [42,43,44,45]. Ambient temperature also influences markers of inflammation [45,46], which may be associated with the longer-term higher risks from weather changes.…”

Section: Discussionmentioning

confidence: 99%

Short-Term Changes in Ambient Temperature and Risk of Ischemic Stroke

Mostofsky¹,

Wilker²,

Schwartz³

et al. 2014

Cerebrovasc Dis Extra

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Background: Despite consistent evidence of a higher short-term risk of cardiovascular mortality associated with ambient temperature, there have been discrepant findings on the association between temperature and ischemic stroke. Moreover, few studies have considered potential confounding by ambient fine particulate matter air pollution <2.5 μm in diameter (PM_2.5) and none have examined the impact of temperature changes on stroke in the subsequent hours rather than days. The aim of this study was to evaluate whether changes in temperature trigger an ischemic stroke in the following hours and days and whether humid days are particularly harmful. Methods: We reviewed the medical records of 1,705 patients residing in the metropolitan region of Boston, Mass., USA, who were hospitalized with neurologist-confirmed ischemic stroke, and we abstracted data on the time of symptom onset and clinical characteristics. We obtained hourly meteorological data from the National Weather Service station and hourly PM_2.5 data from the Harvard ambient monitoring station. We used the time-stratified case-crossover design to assess the association between ischemic stroke and apparent temperature averaged over 1-7 days prior to stroke onset adjusting for PM_2.5. We assessed whether differences in apparent temperature trigger a stroke within shorter time periods by examining the association between stroke onset and apparent temperature levels averaged in 2-hour increments prior to stroke onset (0-2 h through 36-38 h). We tested whether the association varied by health characteristics or by PM_2.5, ozone or relative humidity. Results: The incidence rate ratio of ischemic stroke was 1.09 (95% confidence interval 1.01-1.18) following a 5°C decrement in average apparent temperature over the 2 days preceding symptom onset. The higher risk associated with cooler temperatures peaked in the first 14-34 h. There was no statistically significant difference in the association between temperature and ischemic stroke across seasons. The risk of ischemic stroke was not meaningfully different across subgroups of patients defined by health characteristics. The association between ischemic stroke and ambient temperature was stronger on days with higher levels of relative humidity. Conclusions: Lower temperatures are associated with a higher risk of ischemic stroke onset in both warm and cool seasons, and the risk is higher on days with higher levels of relative humidity. Based on this study and the body of literature on ambient temperature and cardiovascular events, identifying methods for mitigating cardiovascular risk may be warranted.

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Section: Discussionmentioning

confidence: 99%

Short-Term Changes in Ambient Temperature and Risk of Ischemic Stroke

Mostofsky¹,

Wilker²,

Schwartz³

et al. 2014

Cerebrovasc Dis Extra

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“…Our decision to adopt minimum temperature as a control variable was based on the findings of Halonen et al 15 that suggest that cumulative exposure to lower ambient temperatures may lead to an increase in blood pressure due to a mechanism triggered by the cold.…”

Section: Discussionmentioning

confidence: 99%

Particulate matter and hospital admission due to arterial hypertension in a medium-sized Brazilian city

Nascimento¹,

Francisco²

2013

Cad. Saúde Pública

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“…Several studies have pointed out an association between higher conventional BP and lower outdoor temperature [9][10][11], but little is known about the influence of indoor temperature on ambulatory BP indices, such as daytime BP, night-time BP, nocturnal BP fall, and morning BP surge (MBPS), which are independent risk factors for CVD [12,13]. This information will aid in preventing excess winter mortality by improving house-heating and insulation conditions.…”

Section: Introductionmentioning

confidence: 99%