title: Continuous measurement of blood gas tensions in the fetal guinea pig by mass spectrometry.
mesh_terms: D000818:Animals; D001784:Blood Gas Analysis / Q000379:methods*; D002245:Carbon Dioxide / Q000097:blood; D002404:Catheterization / Q000295:instrumentation; D005260:Female; D005312:Fetal Blood / Q000032:analysis*; D006168:Guinea Pigs; D006325:Heart Atria; D013058:Mass Spectrometry / Q000379:methods*; D008863:Microspheres; D009638:Norepinephrine / Q000494:pharmacology; D010100:Oxygen / Q000097:blood; D010920:Placenta / Q000098:blood supply; D011247:Pregnancy
chemical_list: D002245:Carbon Dioxide; D010100:Oxygen; D009638:Norepinephrine