HealthDay News — The transition to daylight saving time (DST) is associated with a transient increase in the risk of ischemic stroke, according to a study scheduled to be presented at the upcoming 2016 American Academy of Neurology Annual Meeting, to be held from April 15 to 21 in Vancouver, Canada.

Jussi O.T. Sipilä, from the University of Turku in Finland, and colleagues examined the effects of DST transitions on stroke hospitalizations and in-hospital mortality in Finland in 2004 to 2013. They compared incidence ratios for 3,033 patients hospitalized during the week following DST transition with expected incidences for 11 801 patients hospitalized 2 weeks before or 2 weeks after the index week.

The researchers found that the incidence of ischemic stroke was increased during the first 2 days after transition (incidence ratio, 1.08; 95% confidence interval, 1.01 to 1.05); the difference was attenuated during observation of the whole week (incidence ratio, 1.03; 95% confidence interval, 0.99 to 1.06). Compared with men, women were more susceptible to temporal changes after DST transitions, with no difference in overall risk of ischemic stroke between genders. The risk was increased for patients with malignancy, and advanced age (>65 years) correlated with increased risk on the first 2 days and second day after DST transition.

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“Further studies must now be done to better understand the relationship between these transitions and stroke risk and to find out if there are ways to reduce that risk,” a coauthor said in a statement.


Sipilä JOT, Ruuskanen J, Rautava P, Kytö V. Daylight Saving Time Transitions, Incidence and In-hospital Mortality of Ischemic Stroke. Presented at: American Academy of Neurology Annual Meeting 2016. April 15-21, 2016. Vancouver.