Sinusoidal fetal heart rate associated with maternal administration of meperidine and promethazine in labor.
D005260:Female; D005318:Fetal Heart / Q000187:drug effects*; D006339:Heart Rate / Q000187:drug effects*; D006801:Humans; D007743:Labor, Obstetric; D008614:Meperidine / Q000494:pharmacology*; D011247:Pregnancy; D011398:Promethazine / Q000494:pharmacology*
D008614:Meperidine; D011398:Promethazine