To explore clinical significant of electronic fetal heart monitoring resulted in a sinusoidal wave of fetal heart rate (FHR).

From March 2005 to July 2010, the clinical data of 12 pregnant women with sinusoidal fetal heart rates were analyzed retrospectively. The study protocol was approved by the Ethical Review Board of Investigation in Human Being of Pukou District Center Hospital. Informed consent was obtained form all participates.

Among 12 pregnant women with sinusoidal fetal heart rate, 10 cases (83%)happened in the active stage and 2 cases(17%) before the active stage. There were 6 cases (50%) of placental abnormality, including 2 of placenta recessive early stripping, 1 of velamentous placenta, 1 of placental obstruction, and 1 of severe calcification of the placenta. In term of amniotic fluid contamination, 2 forⅠ°, 2 for Ⅱ° and 1 for Ⅲ°.And 2 cases (17%) of oligohydramnios(<200 mL). All the 12 newborns survived, including 3 cases (25%) of asphyxia (1 min Apgar score<7) and 3 cases (25%) of maternal-fetal blood transfusion syndrome.

Electronic fetal heart monitoring in a sinusoidal wave is a symptom of severe fetal hypoxemia, which should rescue immediately to reduce mortality.