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WEDNESDAY, Feb. 5, 2020 (HealthDay News) — Seasonal variation in vitamin D status may explain seasonal variation in hypertensive disorders of pregnancy, according to a study published online Feb. 4 in Acta Obstetricia et Gynecologica Scandinavica<\/i>.<\/p>\n
Christine Rohr Thomsen, from Aarhus University Hospital in Denmark, and colleagues examined data from 50,665 previously healthy, nulliparous women with singleton pregnancies who gave birth between 1989 and 2010 at a single institution. Associations between seasonal variation in the risk for hypertensive disorders due to variation in sunlight exposure were examined.<\/p>\n
The researchers found that 8.5 percent of women were diagnosed with a hypertensive disorder of pregnancy. Risk increased for women who conceived during spring and early summer; the risk then peaked during midsummer and decreased steadily during late summer and fall to reach the nadir by winter. Gestational hypertension, preeclampsia, and early-onset preeclampsia all had seasonal variation.<\/p>\n
“This may support the existence of an association between vitamin D and the hypertensive disorders of pregnancy although more direct measurements of the vitamin D status at different times during pregnancy should be studied in relation to pregnancy complications in order to draw more certain conclusions,” the authors write.<\/p>\n