Severe Lower Pulmonary Parenchymal & Obstructive Infections

Pediatric Asthma

Chronic Reversible Inflammatory Airway Hyperreactivity

Primary risk age: Toddlerhood through Adolescence (Onset typically before 5 years)

Urgency: Severe
Typical age: Toddlerhood through Adolescence (Onset typically before 5 years)
Body system: Respiratory System

Typical course: Acute flares resolve within hours to days with appropriate rescue therapy; long-term control is a continuous daily process.

Reviewed against AAP · CDC · WHO · NHS guidance Last reviewed 2026-06-13

1. Summary & Pathophysiology

Chronic Reversible Inflammatory Airway Hyperreactivity

Pathophysiology (Development Path)

Chronic inflammation of the airways leads to hyperreactivity to various stimuli. During an acute flare, exposure to a trigger causes immediate IgE-mediated mast cell degranulation, leading to bronchospasm, mucosal edema, and hypersecretion of thick mucus. This causing widespread airway narrowing, air trapping, and expiratory airflow limitation.

Primary Causes & Etiology

Genetic predisposition combined with environmental triggers, including viral infections (Rhinovirus), allergens (dust mites, pet dander, mold), tobacco smoke, and cold air.

2. Symptom Continuum

Early Onset Signs
Dry, hacking cough (often worsening at night or after physical activity), mild shortness of breath, and fatigue.
Progressive Phase
Audible expiratory wheezing, tachypnea, prolonged expiratory phase, dyspnea, and use of accessory muscles (subcostal/intercostal retractions).
Severe Indicators
Silent chest (absence of wheezing due to severe restriction of airflow), inability to speak in full sentences, cyanosis, nasal flaring, suprasternal retractions, and altered level of consciousness.

3. Clinical Verification

Spirometry demonstrating reversible airway obstruction (FEV1 increase of >12% post-bronchodilator) in children >5 years. Clinical response to bronchodilators in younger children.

4. Care & Elements Plan

Primary Care Treatment Plan

Stepwise pharmacological management. Use inhaled corticosteroids for long-term control of inflammation, and short-acting beta-agonists as rescue therapy for acute bronchospasm. Create an Asthma Action Plan.

Home Support Elements

Identify and strictly eliminate household environmental triggers. Use a peak flow meter daily to monitor lung function in older children. Maintain calm during acute episodes.

Generic Active Ingredients (No Brands)

Albuterol (generic short-acting beta2-agonist active ingredient for quick rescue bronchodilation)
Fluticasone propionate or Budesonide (inhaled corticosteroid active ingredients for long-term daily control)
Prednisolone (oral corticosteroid active ingredient for acute exacerbations).

Lists active elements only. Never administer self-designed therapies.

5. Doctor Critical Lines

Critical Thresholds: When to See a Doctor

Seek immediate care if rescue medications fail to provide relief within 15-20 minutes, if the child cannot speak due to breathlessness, or if chest retractions are visible.

6. Vaccine & Prevention

Routine Prophylaxis (Prevention)

Avoid environmental tobacco smoke, dust mite control measures, annual influenza vaccination, and early management of viral upper respiratory tract infections.

Immunization Context

Annual Influenza vaccination is critical to prevent viral triggers of asthma exacerbations.

7. Timelines & Outlook

Active Timeline

Acute flares resolve within hours to days with appropriate rescue therapy; long-term control is a continuous daily process.

Expected Prognosis

Variable. Many children experience a reduction in symptoms or "outgrow" asthma during adolescence, though airway hyperreactivity may persist.

Potential Untreated Complications

Status asthmaticus (refractory severe asthma), barotrauma (pneumothorax), hypoxemic respiratory failure, and school absenteeism.

Severe

Acute Viral Bronchiolitis

Lower Respiratory Small Airway Inflammatory Disease

Infants under 2 years (Peak window: 2 to 6 months)

Mild

Acute Bronchitis

Acute Inflammatory Bronchial Airway Disease

Preschool and School-age Children