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Pediatric Asthma Overview

A Modern Clinical Guide to Diagnosis & Management

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Pathophysiology

Understand inflammatory mechanisms

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Clinical Presentation

Recognize signs, symptoms, & triggers

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Diagnostic Approach

Apply evidence-based strategies

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Differential Diagnosis

Distinguish asthma from mimics

Chronic airway inflammation with hyperresponsiveness

Airways become sensitive to environmental triggers

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Cellular Components

🔴

Mast Cells

Release histamine

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Eosinophils

Key inflammatory cells

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T Lymphocytes

Coordinate immune response

⚪

Neutrophils

Present in severe asthma

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Inflammatory Mediators

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Histamine

Bronchoconstriction

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Leukotrienes

Potent bronchoconstrictors

⚡

Bradykinin

Vascular permeability

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Cytokines

Inflammatory response

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Clinical Significance

The Pathophysiological Result

The interplay of these cellular components and inflammatory mediators results in heightened airway sensitivity. This leads to the classic triad of asthma symptoms:

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Bronchospasm & Wheezing

😮‍💨

Inflammation & Coughing

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Mucus & Dyspnea

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Global Impact

Disease Burden & Statistics

Most common chronic childhood disease with significant global health burden

5M+

👶 US Children Affected

7.5%

📊 Overall Prevalence

550K

🚑 Emergency Visits

80K

🏥 Hospital Admissions

192

💔 Deaths (2018)

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Demographics

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Gender Distribution

Higher prevalence in boys during childhood
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Geographic Pattern

Urban areas show higher prevalence than rural
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Trending Upward

Global prevalence continues to increase

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Key Symptoms

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Coughing
Often worse at night or with triggers.
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Wheezing
High-pitched sound, especially on exhalation.
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Shortness of Breath (Dyspnea)
Difficulty breathing, feeling of not getting enough air.
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Exercise Intolerance
Coughing or wheezing during or after physical activity.
🤛
Chest Tightness
A sensation of squeezing or pressure in the chest.

Assess the frequency, severity, and precipitating factors of symptoms, along with a family history of asthma and allergies.

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Common Exacerbating Factors

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Viral Infections

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Allergens

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Irritants (Smoke)

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Exercise

🎭

Emotions

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Weather Changes

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Associated Conditions

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Nocturnal Symptoms

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Rhinosinusitis

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Gastroesophageal Reflux

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Aspirin Sensitivity

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Physical Examination & Acute Assessment

Identifying signs of an asthma exacerbation

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Physical Examination

Findings in Acute Episodes

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Tachypnea (Increased respiratory rate)
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Tachycardia (Elevated heart rate)
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Cough
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Wheezing
⏳
Prolonged expiratory phase

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Signs of a Progressing Attack (Severe)

IMMEDIATE ATTENTION REQUIRED

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Cyanosis

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Diminished Air Movement

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Retractions

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Agitation

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Inability to Speak

🤸

Tripod Position

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Diaphoresis

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Pulsus Paradoxus

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Associated Atopic Findings

✋
Eczema
Atopic dermatitis, often on skin flexures.
👃
Allergic Rhinitis
Nasal congestion, sneezing, "allergic shiners".

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Clinical Diagnosis

Evidence-Based Strategy

Combined clinical assessment with objective measurements - No single definitive test

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Spirometry (Gold Standard)

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Age Requirement

Children >5 years old
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Key Measurements

FEV1, FVC, FEV1/FVC ratio
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Reversibility Test

>12% & 200mL improvement

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Peak Flow Monitoring

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Home Assessment

Daily monitoring capability
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Diurnal Variation

>20% suggests asthma
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Limitation

Not for initial diagnosis

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Chest X-ray

Indications

1️⃣
First episode of asthma.
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Recurrent episodes of undiagnosed cough or wheeze.

Purpose & Limitations

✅
Exclude anatomic abnormalities.
❌
Not needed for repeat episodes unless fever or localized findings are present.

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Exhaled Nitric Oxide (FeNO)

Reflects eosinophilic airway inflammation

Clinical Utility

🎯

Identifies patients likely to respond well to corticosteroids.
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Aids in monitoring therapy response and optimizing dosage.
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Helps detect nonadherence to corticosteroid therapy.

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Allergy Testing

Should be part of the evaluation for all children with persistent asthma, but NOT during an acute exacerbation. Its purpose is to identify sensitization to common aeroallergens (pollens, mold, dust mite, pet dander).

Comparison of Methods

Skin Testing

✔️
Results in minutes
✔️
More sensitive

In Vitro Serum Tests (ELISA)

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Less sensitive
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More expensive
⚠️
Takes several days for results

⚠️ Critical Principle

Not all that wheezes is asthma. A systematic differential diagnosis is essential for accurate diagnosis and appropriate treatment planning.

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Differential Diagnosis of Cough & Wheeze

In Infants and Children

Upper Airway Diseases

Allergic rhinitis
Sinusitis

Large Airway Obstruction

Tracheal or bronchial foreign body
Paradoxical vocal fold motion
Vascular rings or laryngeal webs
Enlarged lymph nodes or tumor

Small Airway Obstruction

Viral bronchiolitis or obliterative bronchiolitis
Cystic fibrosis
Bronchopulmonary dysplasia

Other

Recurrent cough not caused by asthma (infection, habit cough, postnasal drip)
Aspiration from swallowing dysfunction or GERD
Heart failure, pulmonary edema

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Infant Considerations

Age-Specific Approach

For persistent cough in the first few months of life, consider specific conditions using the CRADLE mnemonic.

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Clinical Importance

✅

Systematic Evaluation
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Age-Appropriate Diagnosis
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Early Intervention

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Aspergillosis Note

Allergic bronchopulmonary aspergillosis is a hypersensitivity reaction to antigens of the mold Aspergillus fumigatus. It occurs primarily in patients with steroid-dependent asthma and in patients with cystic fibrosis.

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CRADLE Mnemonic

C

Cystic fibrosis
R

Respiratory tract infections
A

Aspiration

Swallowing dysfunction, GERD, tracheoesophageal fistula, foreign body
D

Dyskinetic cilia
L

Lung and airway malformations

Laryngeal webs, laryngotracheomalacia, tracheal stenosis, vascular rings and slings
E

Edema

Heart failure, congenital heart disease

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Take-Home Messages

Key Principles in Pediatric Asthma

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Asthma is a Clinical Diagnosis

Diagnosis relies on a pattern of symptoms, physical examination, and objective tests like spirometry. There is no single definitive test.
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Not All That Wheezes is Asthma

A broad differential diagnosis is critical, especially in young children and infants. Consider conditions from infections to anatomical abnormalities.
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Assess Severity in Acute Events

Promptly identify signs of severe or life-threatening exacerbations (e.g., retractions, speech difficulty) to guide immediate intervention.
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Age-Specific Approaches are Key

The presentation, triggers, and differential diagnosis vary with age. Tailor your evaluation for infants, toddlers, and older children.