Triggering of stroke by ambient temperature variation: A case-crossover study in Maputo, Mozambique

• Type: Article in International Scientific Journal
• Date: 2015

Authors

Gomes, J (Author) Other; Damasceno, A (Author) Other; Carrilho, C (Author) Other; Lobo, V (Author) Other; Lopes, H (Author) Other; Madede, T (Author) Other; Pravinrai, P (Author) Other; Silva Matos, C (Author) Other; Diogo, D (Author) Other; Azevedo A (Author) FMUP; Lunet N (Author) FMUP

Journal

Title: Clinical Neurology and Neurosurgery

Vol. 129

Pages: 72-77

ISSN: 0303-8467

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 14 Citations

Scopus - 14 Citations

Other information

Authenticus ID: P-00A-35K

DOI: 10.1016/j.clineuro.2014.12.002

Abstract (EN): Objectives: The effect of ambient temperature as a stroke trigger is likely to differ by type of stroke and to depend on non-transient exposures that influence the risk of this outcome. We aimed to quantify the association between ambient temperature variation and stroke, according to clinical characteristics of the events, and other risk factors for stroke. Methods: We conducted a case-crossover study based on a 1-year registry of the hospital admissions due to newly occurring ischemic and hemorrhagic stroke events in Maputo, Mozambique's capital city (N = 593). The case-period was defined as the 7 days before the stroke event, which was compared to two control periods (14-21 days and 21-28 days before the event). We computed humidity- and precipitation-adjusted odds ratios (OR) and 95% confidence intervals (95%CI) using conditional logistic regression. Results: An association between minimum temperature declines higher than 2.4 degrees C in any two consecutive days in the previous week and the occurrence of stroke was observed only for first events (OR = 1.43, 95%CI: 1.15-1.76). Stronger and statistically significant associations were observed for hemorrhagic stroke (OR = 1.50, 95%CI: 1.07-2.09) and among subjects not exposed to risk factors, including smoking, high serum cholesterol or atrial fibrillation. No differences in the effect of temperature were found according to the patients' vital status 28 days after the event. Conclusions: First stroke events, especially of the hemorrhagic type, were triggered by declines in the minimum temperature between consecutive days of the preceding week.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6