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Asthma | 마이메르시 MyMerci
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Asthma

NCLEX Review Guide: Pediatric Asthma

Pathophysiology

Airway Inflammation and Bronchoconstriction

  • Pediatric asthma is characterized by chronic airway inflammation leading to bronchial hyperresponsiveness, reversible airflow obstruction, and respiratory symptoms. The inflammation causes edema, mucus hypersecretion, and bronchospasm that narrows airways and increases resistance to airflow.
  • During an asthma exacerbation, bronchoconstriction occurs when smooth muscles surrounding the airways tighten in response to triggers, further narrowing the airway lumen and making breathing difficult for the child.

Key Points

  • Asthma is a chronic inflammatory condition, not just bronchospasm.
  • Pathophysiology involves airway inflammation, bronchial hyperresponsiveness, and reversible airflow obstruction.

Triggers and Risk Factors

  • Common triggers in children include respiratory infections (especially viral), allergens (dust mites, pet dander, pollen), exercise, cold air, tobacco smoke, and strong odors. Identification and avoidance of individual triggers is essential for management.
  • Risk factors for developing childhood asthma include family history of asthma/atopy, personal history of atopic dermatitis or allergic rhinitis, maternal smoking during pregnancy, premature birth, and exposure to air pollution.

Key Points

  • Viral respiratory infections are the most common trigger for asthma exacerbations in children.
  • Children with atopic conditions (eczema, allergic rhinitis) have higher risk of developing asthma.

Clinical Manifestations

Classic Symptoms

  • The hallmark symptoms of asthma in children include wheezing, coughing, chest tightness, and shortness of breath. Symptoms may vary in severity and often worsen at night or early morning.
  • Coughing, especially at night or with exercise, may be the only symptom in some children, referred to as cough-variant asthma. Persistent cough lasting longer than 4 weeks without other causes should raise suspicion for asthma.

Key Points

  • Wheezing may be absent in severe asthma attacks due to minimal air movement ("silent chest" - a medical emergency).
  • Exercise-induced symptoms typically occur 5-10 minutes after starting exercise.

Signs of Respiratory Distress

  • Signs of respiratory distress include tachypnea, use of accessory muscles, nasal flaring, intercostal retractions, and altered mental status. In severe exacerbations, children may be unable to speak in complete sentences due to breathlessness.
  • Objective assessment includes oxygen saturation (pulse oximetry), peak expiratory flow rate (in children old enough to perform the test), and auscultation findings (wheezing, prolonged expiratory phase, decreased breath sounds).

Clinical Scenario

8-year-old Miguel presents to the emergency department with difficulty breathing after playing soccer. He is sitting upright, leaning forward, and speaking in short phrases. Assessment reveals respiratory rate of 32, audible wheezing, intercostal retractions, and SpO₂ of 91% on room air. This presentation suggests a moderate-to-severe asthma exacerbation requiring prompt intervention.

Key Points

  • Assess work of breathing by looking for accessory muscle use, retractions, and positioning.
  • Oxygen saturation <95% indicates significant exacerbation.

Assessment and Diagnosis

History and Physical Examination

  • A comprehensive history should include symptom pattern (frequency, severity, timing), triggers, family history of asthma or atopy, previous exacerbations, and response to medications. Document impact on daily activities, sleep, school attendance, and exercise tolerance.
  • Physical examination focuses on respiratory assessment but should also include evaluation for comorbid conditions like allergic rhinitis, atopic dermatitis, or signs of chronic illness that might suggest alternative diagnoses.

Key Points

  • Document symptom pattern, triggers, and response to previous treatments.
  • Assess for comorbid allergic conditions that often accompany asthma.

Diagnostic Testing

  • Pulmonary function testing (PFT) is the gold standard for diagnosing asthma in children over 5-6 years old. Spirometry showing obstruction (FEV₁/FVC ratio <80%) with bronchodilator reversibility (>12% improvement in FEV₁) supports an asthma diagnosis.
  • Additional tests may include allergy testing to identify specific triggers, chest X-ray to rule out other conditions, and exhaled nitric oxide measurement (FeNO) to assess airway inflammation.

Key Points

  • Bronchodilator reversibility on spirometry is key diagnostic criterion.
  • Diagnosis in children <5 years is often clinical, based on symptom pattern and response to treatment.

Management and Treatment

Pharmacological Management

  • Asthma medications fall into two main categories: controller medications (for long-term control) and rescue medications (for quick relief). Controllers include inhaled corticosteroids (ICS), leukotriene modifiers, and long-acting beta-agonists (LABAs), while the primary rescue medication is short-acting beta-agonists (SABAs).
  • Treatment follows a stepwise approach based on symptom severity and control, with inhaled corticosteroids being the cornerstone of long-term management for persistent asthma. Medication delivery devices must be age-appropriate and technique should be regularly assessed.

Controller vs. Rescue Medications

Controller Medications Rescue Medications
Inhaled corticosteroids (fluticasone, budesonide) Short-acting beta-agonists (albuterol, levalbuterol)
Leukotriene modifiers (montelukast) Anticholinergics (ipratropium)
Long-acting beta-agonists (salmeterol) Systemic corticosteroids (for exacerbations)
Used daily to prevent symptoms Used as needed for acute symptoms
Reduces inflammation and prevents exacerbations Provides immediate bronchodilation

Key Points

  • Inhaled corticosteroids are first-line therapy for persistent asthma in children.
  • Frequent use of rescue medications (>2 days/week) indicates poor control and need for step-up therapy.

Management of Acute Exacerbations

  • Initial management of acute exacerbations includes administration of oxygen (to maintain SpO₂ >94%), repeated doses of inhaled short-acting beta-agonists, and early administration of systemic corticosteroids for moderate to severe exacerbations.
  • For severe exacerbations unresponsive to initial treatment, additional therapies may include intravenous magnesium sulfate, inhaled ipratropium bromide, and consideration of adjunctive therapies like heliox or non-invasive ventilation.

    Procedure: Managing Acute Asthma Exacerbation

  1. Assess severity using respiratory rate, work of breathing, oxygen saturation, and ability to speak
  2. Administer oxygen to maintain SpO₂ >94%
  3. Give inhaled SABA (albuterol): 4-8 puffs via MDI with spacer or 2.5-5 mg via nebulizer
  4. Administer oral corticosteroids for moderate-severe exacerbations (prednisone/prednisolone 1-2 mg/kg, max 60 mg)
  5. Reassess after initial treatment; if improving, continue SABA every 1-4 hours as needed
  6. If not improving, add ipratropium bromide and consider additional interventions
  7. Monitor closely for signs of respiratory failure requiring higher level of care

WARNING: A "silent chest" (absence of wheezing with severe respiratory distress) indicates critical airway obstruction and impending respiratory failure requiring immediate intervention!

Key Points

  • Early administration of systemic corticosteroids reduces hospitalization rates.
  • Continuous monitoring of respiratory status and response to treatment is essential.

Non-Pharmacological Management

  • Environmental control measures include identifying and avoiding triggers, reducing exposure to allergens (dust mites, pet dander, cockroaches), eliminating tobacco smoke exposure, and improving indoor air quality.
  • Patient/family education should cover the chronic nature of asthma, proper medication technique, recognition of worsening symptoms, and an individualized written asthma action plan. Regular follow-up and asthma control assessment is essential.

Key Points

  • Written asthma action plans improve outcomes and should be reviewed at each visit.
  • Proper inhaler technique is critical for medication effectiveness and should be reassessed regularly.

Commonly Confused Points

Asthma vs. Bronchiolitis vs. Pneumonia

Feature Asthma Bronchiolitis Pneumonia
Age Any age, often >2 years Typically <2 years Any age
Onset Recurrent episodes Acute, seasonal Acute
Fever Usually absent or low-grade Low-grade common Often high
Wheezing Expiratory, diffuse Expiratory, diffuse Localized if present
Cough Dry, worse at night Persistent, wet Productive
Chest X-ray Hyperinflation Hyperinflation, peribronchial cuffing Infiltrates, consolidation
Response to bronchodilators Good Variable, often poor Poor

Key Points

  • History of recurrent episodes suggests asthma rather than bronchiolitis.
  • Bronchiolitis primarily affects infants and is usually caused by respiratory syncytial virus (RSV).
  • Pneumonia typically presents with fever and focal findings on examination or imaging.

Inhaled Corticosteroids vs. Systemic Corticosteroids

Feature Inhaled Corticosteroids (ICS) Systemic Corticosteroids
Purpose Daily controller medication Acute exacerbation treatment
Examples Fluticasone, budesonide, beclomethasone Prednisone, prednisolone, methylprednisolone
Duration of use Long-term, daily Short courses (3-5 days typically)
Onset of action Days to weeks Hours
Side effects Minimal: oral thrush, hoarseness Significant: mood changes, increased appetite, hyperglycemia
Effect on growth Minimal at recommended doses Can affect growth with repeated or prolonged use

Key Points

  • ICS are for prevention, while systemic corticosteroids are for treatment of exacerbations.
  • Instruct patients to rinse mouth after ICS use to prevent oral thrush.

Study Tips and Memory Aids

Assessing Asthma Severity

Memory Aid: "ASTHMA" Assessment

  • Activity limitation
  • Shortness of breath (frequency)
  • Time of day symptoms occur
  • Help needed (rescue medication use)
  • Missed school or activities
  • Awakening at night

Memory Aid: Signs of Severe Exacerbation "TICS"

  • Tachypnea (increased respiratory rate)
  • Intercostal retractions
  • Cyanosis or decreased oxygen saturation
  • Speech difficulty (single words/phrases only)

Key Points

  • Regular assessment of control is essential for appropriate step-up or step-down therapy.
  • Nighttime awakening is a key indicator of poor asthma control.

Medication Administration Tips

Memory Aid: Age-Appropriate Delivery Devices

  • 0-3 years: MDI with infant mask spacer
  • 4-6 years: MDI with pediatric mask or mouthpiece spacer
  • 6+ years: MDI with mouthpiece spacer or dry powder inhaler (DPI)

Memory Aid: MDI Technique "PUFF"

  • Prepare inhaler (shake and attach to spacer)
  • Unleash one puff into spacer
  • Full breaths (5-6 normal breaths through spacer)
  • Finish by waiting 30-60 seconds before next puff

Key Points

  • Always use a spacer with metered-dose inhalers in children.
  • Reassess inhaler technique at every visit.

Summary of Key Points

  • Asthma is a chronic inflammatory airway disease characterized by reversible airflow obstruction, bronchial hyperresponsiveness, and recurrent symptoms of wheezing, coughing, chest tightness, and shortness of breath.
  • Management follows a stepwise approach with inhaled corticosteroids as the cornerstone of controller therapy for persistent asthma, and short-acting beta-agonists for rescue treatment.
  • Acute exacerbation management includes oxygen, frequent short-acting beta-agonists, and early systemic corticosteroids for moderate to severe exacerbations.
  • Patient education, environmental control measures, and a written asthma action plan are essential components of comprehensive asthma management.
  • Regular assessment of control and appropriate adjustment of therapy is necessary to minimize symptoms and prevent exacerbations.

Common Pitfalls

  • Failing to recognize that cough-variant asthma may present without wheezing
  • Not providing a written asthma action plan for all patients
  • Overlooking the importance of proper inhaler technique
  • Confusing controller and rescue medications
  • Missing the significance of a "silent chest" as a sign of severe obstruction

Quick Check

1. What is the first-line controller medication for persistent asthma in children?

2. Name three signs of respiratory distress in a child with asthma.

3. How would you differentiate between asthma and bronchiolitis?

4. What is the significance of using rescue medication more than twice weekly?

5. What are the components of a comprehensive asthma action plan?

Self-Assessment Checklist

  • I can explain the pathophysiology of asthma
  • I can identify common triggers and risk factors
  • I can recognize signs and symptoms of asthma exacerbations
  • I understand the difference between controller and rescue medications
  • I can describe appropriate management of acute exacerbations
  • I can explain key components of asthma education
  • I understand age-appropriate delivery devices for asthma medications

Remember, asthma management is about partnership with the child and family. Your thorough understanding of this condition will help empower families to manage symptoms effectively, prevent exacerbations, and help children lead normal, active lives despite their diagnosis. You've got this!

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