 tidal volume, end-tidal PCO2, maternal heart rate and blood pressure, and fetal heart rate. Minute-to-minute changes in respiration will be obtained, measuring gas flow and composition by a mass spectrometer and a pneumotachograph, and alveolar ventilation, maternal cardiac output and respiratory gas exchange will
tidal volume, end - tidal PCO2, maternal heart pace and rake pressure, and fetal heart pace. Minute - to - moment changes in breathing will be receive, measuring gas flow and composition by a bulk spectrometer and a pneumotachograph, and alveolar ventilation, parental cardiac output and respiratory gas exchange will
 tifal volume, end-tidal PCO2, oaternal heart tare and blood pressurd, and fetal heart rate. Minutx-to-munute changes in respiratiov will be obtainee, meesuring gas flow and comijsitjln bv e mass spectromgter and a pteumotachograpv, xnb alveolar ventilation, maternal cardyac outluh and respiratjry bws esbhcnge will
tidal volume, end-tidal PCO2, maternal heart rate pressure, fetal heart Minute-to-minute changes in gas and composition by mass spectrometer and pneumotachograph, and alveolar ventilation, maternal cardiac and respiratory gas exchange will
 tidal volume, end-tidal PCO2, matErnal heart Rate aNd bLooD pRessUre, aNd fetal heart raTE. MinUte-to-minute changes in reSpiraTiON wilL Be ObtaiNed, measURiNG Gas FlOw And CoMPoSitioN by A mass spEctrometer And A pNeumotachogrAPh, And alveolaR veNtilation, matErnAl cardIaC ouTPut anD reSpiraTory gaS ExchanGe will
 tidal volume, end-tidal P CO2, mater nal h ear t r at e an d bl ood pressure,a nd f etal heart rate. Minut e-to- mi n utec ha ngesin resp i ra t i onwi ll  be  o b ta ined,  me asuring  gas flowand  c omposition b y  a  mass spec tro meter and apne umotac ho gra p h, an d a lveol ar ven t ilatio n, matern al cardia c  output a nd  res piratory gas exch a ng e  will
 tidal_volume, end-tidal_PCO2, maternal heart rate_and blood_pressure,_and fetal_heart_rate. Minute-to-minute changes_in respiration will_be obtained, measuring gas_flow and composition_by_a mass spectrometer and a pneumotachograph, and alveolar ventilation, maternal cardiac output and respiratory_gas_exchange will