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Pregnancy increases stroke risk up to 1 year postpartum and reduces long-term risk.

Background: : The incidence of stroke in pregnant women is low but trending upward. There are few studies of the topic in women of Asian ethnicity.

Aim: We aim to evaluate stroke risk in Asian women during and after pregnancy.

Design: : Using the Taiwan National Health Insurance database, we designed a retrospective study that included 18-45-year-old pregnant women between the years 2000 and 2010. We selected a 1:1 age-matched control group of non-pregnant women. The endpoint was any type of stroke during pregnancy or the postpartum period; otherwise, the patients were tracked until 31 December 2010.

Methods: : The risk factors for stroke were found using Cox proportional regression to calculate the hazard ratio (HR) with a 95% CI compared with the control group.

Results: : The incidence of stroke within 1 year postpartum was 71/100,000. The risk of postpartum stroke within 1 year was an HR of 1.208 (95% CI: 1.001-5.129). The occurrence of stroke was associated with hypertension, diabetes mellitus, coagulation disorders, migraine, obesity, cerebrovascular malformation and parity. Women with third and fourth parity carried increased risks of 13.3% and 2.5%, respectively, compared with first parity women. In long-term follow-ups, stroke risk was significantly lower, with an adjusted HR of 0.362 (95% CI: 0.269-0.489).

Conclusion: The risk of stroke was elevated during the first year postpartum, but lower in subsequent years. Stroke risk increased in multiparous (≥3) women. Physicians should be on alert for pregnancy complications and ensure appropriate management to prevent postpartum stroke.

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