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Chapter 16: Asthma in pregnancy

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The course of asthma during pregnancy may be affected by maternal physiological changes and triggers of asthma such as viral infections, exposure to allergens, and nonadherence with therapy. If asthma is uncontrolled, there are recognized harmful effects not only to the mother but also to the fetus. However, with effective asthma control, most women have outcomes, at or near that of the general population. Many medications are considered appropriate for use in pregnancy including inhaled corticosteroids (ICSs) such as budesonide, beclomethasone dipropionate, and fluticasone and the leukotriene receptor antagonists montelukast and zafirlukast. When ICSs or ICS/long-acting beta2-adrenergic agonist combinations are not effective during exacerbations of asthma, short courses of oral corticosteroids should be administered earlier rather than later. Spirometry and flow volume loop tracings are useful measures of pulmonary function for gravidas. Results may be compared with nonpregnant reference values. Vocal cord dysfunction may be suspected when the inspiratory loop is truncated. The gravida does not reject the fetus because of lack of vascular continuity, a trophoblast layer causing separation, and suppressive mechanisms at the placental interface. The secretion of IL-10 increases in pregnancy and is lower in women with recurrent spontaneous abortions. Only immunoglobulin G (IgG) subclasses are transported across the placenta, especially IgG1, IgG3, and IgG4. Fetal B cells can produce endogenous IgE by 20 weeks of gestation.
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Keywords: Asthma; asthma control; corticosteroids; inhaled; leukotriene receptor antagonists; medications; oral corticosteroids; physiological changes; pregnancy; spirometry

Document Type: Research Article

Publication date: 01 May 2012

More about this publication?
  • Allergy and Asthma Proceedings is a peer reviewed publication dedicated to distributing timely scientific research regarding advancements in the knowledge and practice of allergy, asthma and immunology. Its primary readership consists of allergists and pulmonologists.

    The goal of the Proceedings is to publish articles with a predominantly clinical focus which directly impact quality of care for patients with allergic disease and asthma.

    Featured topics include asthma, rhinitis, sinusitis, food allergies, allergic skin diseases, diagnostic techniques, allergens, and treatment modalities. Published material includes peer-reviewed original research, clinical trials and review articles.

    Articles marked "F" offer free full text for personal noncommercial use only.

    The journal is indexed in Thomson Reuters Web of Science and Science Citation Index Expanded, plus the National Library of Medicine's PubMed service.
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