• G Grindheim, K Toska, M-E Estensen, and L A Rosseland.
• Department of Anaesthesiology, Division of Critical Care, Oslo University Hospital, Rikshospitalet, and Department of Physiology, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway. Guro.Grindheim@oslo-universitetssykehus.no
• BJOG. 2012 Jan 1;119(1):94-101.

ObjectiveTo record any physiological changes in lung function during healthy pregnancies, and evaluate the influence of parity, pregestational overweight, and excessive weight gain.DesignLongitudinal cohort study.SettingAntenatal clinic at Oslo University Hospital.PopulationOne hundred healthy white women with singleton pregnancies.MethodsThe women were studied with repeated measures of lung function using spirometry at a gestational age of 14-16, 22-24, 30-32, and 36 weeks, and at 6 months postpartum.Main Outcome MeasuresForced vital capacity (FVC), forced expiratory volume in 1 second (FEV1), and peak expiratory flow (PEF), also expressed as a percentage of predicted values according to age and height: i.e. FVC%, FEV1%, and PEF%.ResultsBoth FVC and FVC% increased significantly after 14-16 weeks of gestation (P=0.001), as was the case for both PEF and PEF% (P<0.001). FVC, FVC%, PEF, and PEF% in early and mid-pregnancy were significantly lower compared with the postpartum value (all P<0.05). Nulliparous women had an overall 4.4% lower value of FVC% than parous women (P=0.039). There were no differences in FVC, FEV1, or PEF dependent upon pregestational overweight or excessive weight gain.ConclusionsForced vital capacity (FVC) increases significantly after 14-16 weeks of gestation. The FVC% is significantly higher in parous compared with primigravida women, suggesting that the changes in FVC occurring during pregnancy persist postpartum. PEF increases significantly during healthy pregnancies, and should be interpreted cautiously in pregnant women with impaired lung function.© 2011 The Authors BJOG An International Journal of Obstetrics and Gynaecology © 2011 RCOG.

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