HEA 3071 Module 3 Childhood Asthma Case Study: Airway Inflammation and Inhaled Steroids Example

Coughing at Night: Airway Inflammation in a Newark Third Grader

Student Name

B.S. in Health Studies, Thomas Edison State University

HEA-3071: Pathophysiology for Health Professionals

Mentor Name

Month Day, Year

Coughing at Night: Airway Inflammation in a Newark Third Grader

The Patient

Aaliyah is invented for this case. She is 9, in third grade in Newark, and lives with her mother and grandmother in an older apartment building near a highway. For two months she has coughed most nights, waking her mother. After recess she wheezes and feels her chest tighten, and she has missed four days of school. Eczema troubled her as a toddler, and her mother has allergies. She uses a rescue inhaler, albuterol, from an urgent care visit about five times a week. In the clinic, she has scattered wheezes, and spirometry shows reduced airflow that improves after albuterol.

Normal Airways

Air passes through branching bronchi and bronchioles lined by epithelium with cilia and mucus-producing cells, surrounded by smooth muscle. The epithelium forms a barrier, and the mucus traps particles that cilia sweep out. Smooth muscle tone keeps the airways open without narrowing them.

What Happens in Asthma

Holgate et al. (2015) described asthma as a heterogeneous disease marked by chronic airway inflammation and variable airflow obstruction. In many children, the inflammation is allergic. When a sensitized child inhales an allergen such as dust mite, cockroach or mouse proteins, immune cells called T helper 2 cells release cytokines that drive production of immunoglobulin E, recruit eosinophils and activate mast cells. Mast cells bound with immunoglobulin E release histamine and leukotrienes, causing smooth muscle to contract, blood vessels to leak and mucus to increase. A damaged epithelium releases its own alarm signals that keep the cycle going. Over time, repeated inflammation can thicken the airway wall, enlarge smooth muscle and mucus glands and lay down extra collagen, changes known as remodeling. The airways become hyperresponsive, narrowing too easily in response to triggers such as cold air, exercise, smoke and viral infections.

Explaining Aaliyah's Symptoms

Her nighttime cough reflects inflammation and mucus that worsen at night, when cortisol levels are lowest and lying down changes airway reflexes. Wheezing is the sound of air moving through narrowed airways. Exercise at recess, especially in cold air, cools and dries the airway lining and triggers narrowing in a hyperresponsive airway. Improvement after albuterol shows that much of the obstruction is reversible smooth muscle contraction. Her history of eczema and family allergy fits the allergic pattern.

Treating Inflammation

Albuterol relaxes smooth muscle but does nothing for inflammation. Using it five times a week shows her asthma is not controlled. Inhaled corticosteroids reduce the inflammatory cells and cytokines that drive the disease.

In the Childhood Asthma Management Program, more than 1,000 children aged 5 to 12 with mild to moderate asthma were randomly assigned to inhaled budesonide, nedocromil or placebo and followed for four to six years (Childhood Asthma Management Program Research Group, 2000). Lung function after bronchodilator use did not differ at the end of the trial, suggesting the steroid did not change the long-term course of lung growth. But children on budesonide had fewer symptoms, less need for rescue medicine, fewer urgent care visits and hospitalizations and less airway hyperresponsiveness. Their growth was slightly slower in the first year, by about one centimeter, a difference that did not increase afterward.

Suissa et al. (2000) studied a population of asthma patients in Saskatchewan and found that people who used low-dose inhaled corticosteroids regularly were less likely to die of asthma. Every extra canister a patient had used over the prior twelve months went with a lower death rate, and stopping the inhaler was associated with higher risk.

Matching Treatment to Mechanism

For Aaliyah, her clinician prescribed an inhaled corticosteroid at low dose, taken every day through a spacer, and wrote an asthma action plan. The plan explains which medicine to use daily, what to do when symptoms worsen and which danger signs mean going straight to an emergency room. The clinician checked her inhaler technique, since poor technique delivers less medicine to the lungs.

Home and Neighborhood

Aaliyah's apartment and neighborhood add triggers. Older buildings may have cockroaches, mice and mold, all common allergens. Traffic pollution near highways is linked to asthma symptoms. Black and Hispanic children in cities have higher rates of asthma and of emergency visits, reflecting housing, pollution and access to care. A home visit program could help her family reduce allergens with traps, sealed food containers and mattress covers.

What Happens in an Attack

During an asthma attack, narrowing spreads through many small airways at once. Air can still enter during inspiration, when the airways widen slightly, but it is trapped during expiration, so the lungs overinflate and breathing becomes hard work. Areas of lung that receive blood but little air lower the oxygen level. Early in an attack, fast breathing drives carbon dioxide down. If carbon dioxide stops falling, or starts to climb, while a child is still breathing fast, she is in danger, because it means she is tiring. A quiet chest with little wheeze can mean so little air is moving that wheezing cannot be heard.

Safety of Steroids in Children

Parents often worry about steroids. Inhaled doses are small and act mainly in the airways, unlike steroid pills. The small early growth effect in CAMP is weighed against fewer attacks, hospital stays and missed school.

Limits

The trials included children with mild to moderate asthma, not severe disease. The Saskatchewan study was observational. Aaliyah is invented, and her plan illustrates principles rather than advice for any child.

Conclusion

Aaliyah's night cough and wheeze come from inflamed, hyperresponsive airways. Holgate and colleagues explain the allergic inflammation that drives them. CAMP showed that daily inhaled steroids reduce symptoms and hospital visits in children, and Suissa and colleagues linked regular use to fewer deaths. Treating the inflammation, teaching inhaler technique and reducing home triggers address the disease at its source.

References

Childhood Asthma Management Program Research Group. (2000). Long-term effects of budesonide or nedocromil in children with asthma. New England Journal of Medicine, 343(15), 1054-1063. https://doi.org/10.1056/NEJM200010123431501

Holgate, S. T., Wenzel, S., Postma, D. S., Weiss, S. T., Renz, H., & Sly, P. D. (2015). Asthma. Nature Reviews Disease Primers, 1, Article 15025. https://doi.org/10.1038/nrdp.2015.25

Suissa, S., Ernst, P., Benayoun, S., Baltzan, M., & Cai, B. (2000). Low-dose inhaled corticosteroids and the prevention of death from asthma. New England Journal of Medicine, 343(5), 332-336. https://doi.org/10.1056/NEJM200008033430504