Advancing Learners Pediatric Clinical Reasoning and Knowledge
Key Points
Wheezing does not mean someone has asthma.
Wheezing generally means that someone has bronchospasm which can occur once or twice at any age.
Asthma is a chronic condition where there is bronchospasm (i.e. spasms of the muscles that control the flow of air in the lung airways) and inflammation (of the lining of the airways). As it is a chronic condition, it has to occur more than once over time, with 3 times or more sometimes used as a functional definition.
Lung airways are like a balloon.
Bronchospasm and inflammation decrease the size of the airways just like stretching the top part of a balloon. When the balloon’s top is stretched, the balloon makes a wheezing sound. If stretched too tight, there actually is no sound as all the airflow is blocked. When medications are used, it is like the top of the balloon not being stretched. All the air escapes and the wheezing sound also stops because there is free flow of air.
Asthma medications work differently. Bronchodilators are used to stop the muscle spasms. Steroids are used to decrease inflammation and swelling of the airway lining. Both of these open up the airway and allow more air to flow. Patients should feel better because air is flowing and the wheezing should decrease. N.B. if wheezing is decreasing it could be because the airflow is improving or actually getting worse, so overall patient clinical status is very important to assess.
Today bronchodilator-steroids combination medications are often used. If used separately, bronchodilators are used first to help open up the airways quickly, and allow the steroid to better penetrate the airways.
Metered-dose inhalers can be difficult to use properly, especially having enough distance between the inhaler and the back of the mouth. Therefore spacers are recommended to be used by many adults and almost all children. Plastic spacers have an electrostatic charge which may cause the medication to stick to the inside of the spacer and not pass to the patient. “Priming” the spacer with ~6 puffs of bronchodilator usually suffices to block this charge and allows the medication to pass to the patient. Priming should be done again after about 1-2 weeks of daily use, if the spacer has not been used after 1-2 weeks, and after washing.
Explore Cases on PediatricEducation.org
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Cases By Disease – Asthma
Cases By Disease – Asthma In Children
Cases By Symptom – Shortness of Breath
AI Generated Learning Materials from PediatricEducation.org Content (not reviewed)
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Author
Donna M. D’Alessandro, MD
Professor of Pediatrics, University of Iowa
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