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It’s time to do something about your allergies
Practical Tips for Pregnant Patients with Asthma or Other Allergic Conditions
Asthma and other allergic problems are among the most common of potentially serious illnesses complicating pregnancy. About 1 of every 100 pregnant women suffer from asthma during their pregnancy. Many more suffer from hay fever and other allergies.
Here are answers to some of the most common questions pregnant patients ask, provided by the Pregnancy Committee of the American College of Allergy and Immunology.
Will asthma have any effect on my pregnancy and on the baby?
If uncontrolled, severe asthma may be harmful to the developing fetus. However, if well-
How does severe, uncontrolled asthma adversely affect the fetus?
The developing fetus depends on the mother to supply oxygen for growth and survival. Oxygen dissolved in her blood is transferred through the placenta to the fetus. Uncontrolled asthma causes a decrease in the mother’s oxygen which, in turn, reduces the oxygen available to the developing fetus. This may result in impaired fetal growth; it could even affect survival of the fetus.
Will my asthma worsen during pregnancy? Is there any greater risk during labor and delivery?
Your asthma may worsen, stay unchanged or possibly improve during pregnancy. Although is cannot be accurately predicted in a first pregnancy, asthma usually follows the same course in subsequent pregnancies. For reasons not totally understood, asthma usually improves during labor and delivery, but even if a severe attack occurs then, appropriate treatment can be given, and complications are rare.
Is there anything that I as a patient, pregnant or not, can do to prevent symptoms of asthma or allergies and lessen the need for medications?
Avoid asthma triggers such as cigarette smoke, exposure to animals, dusty and damp environments. Stay in an air-
Can any of the medications I take for my asthma cause harm to my baby?
Most medications used to treat asthma appear to be safe, especially those that have been around for many years and have been time tested. Unfortunately, it is very difficult to do adequate studies in pregnant women to prove the safety of drugs.
Since we cannot prove the safety of drugs taken during pregnancy, should I stop taking my asthma medication as soon as I discover that I have become pregnant?
No. A moderate to severe asthma attack could be a risk to both you and the baby. The risks of stopping your medication are far greater than any potential risk to your baby. Therefore, do not stop your regular asthma medications unless your doctor recommends it.
Are other medications taken for my hay fever or other allergies also safe?
Probably. However, some minor birth defects have been linked to certain antihistamines and decongestants in some studies, but study results have not been consistent. It would be best to call your physician before continuing antihistamines or decongestants, even those available over the counter.
If I become short of breath, how can my doctor know if my baby is getting sufficient oxygen?
There are tests that can accurately assess the breathing status of the mother, such as spirometry, arterial blood gases or pulse oximetry. Spirometry, an office breathing test, measures air flow into the lungs. A blood gas study is done in the hospital to measure oxygen content of the blood. Pulse oximetry is a way of estimating the oxygen content of blood without a needle stick. Results on all three tests are available almost immediately. Ask your doctor about using an inexpensive portable “peak flow meter” with which you can assess changes in the severity of your asthma at home before you get in trouble.
Are there any medications that should be avoided during pregnancy?
Unless a life-
- Sulfonamides (the “sulfa” drugs) are safe early in pregnancy, but their use in the last trimester might result in a jaundiced infant.
- Tetracyclines may cause skeletal and dental deformities.
containing drugs used as expectorants can result in serious thyroid disease in the newborn.
Should I continue my allergy shots during pregnancy?
It is appropriate to continue allergy shot during pregnancy in women who are not having reactions to the shots, because they may lessen you allergic or asthma symptoms. There is no evidence that they have any influence on preventing allergies in the newborn. It is not generally recommended that allergy shots be started during pregnancy.
It is extremely important to monitor closely any asthma or allergic problems during your pregnancy. In the vast majority of cases, you and your child can look forward to a good outcome, even if your asthma is severe, so long as you follow your doctor’s instructions carefully. At the very first signs of breathing difficulty, call your doctor. Remember the danger of providing an inadequate supply of oxygen to your baby is a much greater risk than taking the commonly used asthma medications.