title: Sinusoidal fetal heart rate pattern associated with intravenous butorphanol administration: a case report.
mesh_terms: D000328:Adult; D002077:Butorphanol / Q000009:adverse effects*; D005260:Female; D005312:Fetal Blood / Q000187:drug effects; D005318:Fetal Heart / Q000187:drug effects*; D006339:Heart Rate / Q000187:drug effects*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D009019:Morphinans / Q000009:adverse effects*; D011247:Pregnancy
chemical_list: D009019:Morphinans; D002077:Butorphanol