title: Effect of morphine upon maternal capillary blood oxygen and carbon dioxide tension.
mesh_terms: D002196:Capillaries; D002245:Carbon Dioxide / Q000097:blood*; D002986:Clinical Trials as Topic; D005260:Female; D006801:Humans; D009020:Morphine / Q000494:pharmacology*; D010100:Oxygen / Q000097:blood*; D010313:Partial Pressure; D010919:Placebos; D011247:Pregnancy; D012119:Respiration / Q000187:drug effects
chemical_list: D010919:Placebos; D002245:Carbon Dioxide; D009020:Morphine; D010100:Oxygen