Sleep-Disordered Breathing

SDB Unveiled - Noisy Nights, Nasty Naps

• SDB Spectrum: Spectrum of increasing severity.
  • Primary Snoring (PS): Snoring without apnea, hypopnea, or O2 desaturation.
  • Upper Airway Resistance Syndrome (UARS): Snoring, increased respiratory effort, sleep fragmentation; normal O2 saturation.
  • Obstructive Sleep Apnea Hypopnea Syndrome (OSAHS): Recurrent partial/complete upper airway obstruction during sleep; with O2 desaturation and/or arousals.
• Epidemiology:
  • Prevalence: OSAHS in 1-4% of children.
  • Peak Age: 2-8 years, linked to adenotonsillar tissue growth.
• Key Risk Factors:
  • Adenotonsillar hypertrophy (ATH): Most common.
  • Obesity: Significant factor.
  • Craniofacial anomalies: E.g., Pierre Robin sequence, Down syndrome, achondroplasia.
  • Neuromuscular diseases: E.g., Cerebral Palsy, Duchenne muscular dystrophy.
• Pathophysiology:
  • Children: Smaller airway caliber, increased collapsibility.
  • Adenotonsillar tissue: Key obstruction site.
  • REM sleep: Worsens with REM atonia.

⭐ Adenotonsillar hypertrophy is the most common surgically correctable cause of SDB in otherwise healthy children.

Diagnosing Distress - Sleep Sleuth Skills

Clinical Clues:

• Nocturnal: Loud/gasping snoring, witnessed apneas, restless sleep, paradoxical chest movements, enuresis, diaphoresis.
• Daytime: Mouth breathing, hyponasal voice, morning headaches, daytime sleepiness/irritability, hyperactivity (ADHD mimic), poor school performance, FTT.
  • 📌 SNORE Mnemonic: Snoring, Nocturnal awakenings, Observed apneas, Restless sleep, Excessive daytime sleepiness/hyperactivity.

Initial Assessment:

• Questionnaires: Pediatric Sleep Questionnaire (PSQ), BEARS.
• Physical Exam:
  • Tonsil size (Brodsky 0-4).
  • Adenoid facies, nasal obstruction, high arched palate, micrognathia, BMI.
  • 

Definitive Diagnosis: Polysomnography (PSG)

• Gold Standard. Indications: Uncertain diagnosis, comorbidities, pre-op for high-risk (e.g., <3 yrs, severe OSA).
• Key Parameters (Pediatric):
  • Apnea-Hypopnea Index (AHI): Normal <1/hr; Mild 1-5/hr; Moderate >5-10/hr; Severe >10/hr.
  • Oxygen Desaturation: Nadir SpO2.
  • Hypercapnia: ETCO2 >50 mmHg for >25% TST or peak >53 mmHg.

⭐ Pediatric AHI thresholds (Normal <1/hr, Mild 1-5/hr) are much lower than adult criteria, highlighting greater vulnerability in children.

Diagnostic Pathway:

Treatment & Troubles - Quieting the Chaos

Management Strategies:

• Adenotonsillectomy (T&A): First-line for OSAHS with adenotonsillar hypertrophy (ATH). Success ~70-80%. Consider for symptomatic mild OSA.
• Positive Airway Pressure (PAP):
  • CPAP/BiPAP for:
    • Persistent OSA post-T&A.
    • Severe OSA (AHI >10).
    • T&A contraindicated/refused/ineffective (e.g., obesity, craniofacial).
  • Adherence is key.
• Weight Management: Crucial for obese children; adjunctive or primary.
• Other Medical:
  • Intranasal corticosteroids (e.g., fluticasone) for mild OSA/Primary Snoring (PS) + allergic rhinitis.
  • Montelukast (limited evidence).
• Orthodontic: Rapid Maxillary Expansion (RME) for select cases with malocclusion.
• Observation/Positional Therapy: For very mild, asymptomatic cases.

Untreated Complications:

• Neurocognitive: ↓Executive function, learning issues, ADHD link.
• Cardiovascular: Systemic/Pulmonary HTN, RV/LV dysfunction (rare).
• Metabolic: Insulin resistance, dyslipidemia.
• Growth: Impairment / Failure to Thrive (FTT).

⭐ Adenotonsillectomy is the first-line surgical treatment for most children with Obstructive Sleep Apnea Syndrome (OSAHS) due to adenotonsillar hypertrophy, boasting a success rate of approximately 70-80%.

High‑Yield Points - ⚡ Biggest Takeaways

• Obstructive Sleep Apnea (OSA), primarily due to adenotonsillar hypertrophy, is the most common pediatric Sleep-Disordered Breathing (SDB).
• Polysomnography (PSG) is the gold standard for diagnosing OSA in children.
• Key symptoms include habitual snoring, witnessed apneas, mouth breathing, and daytime neurobehavioral issues like hyperactivity or somnolence.
• Complications of untreated OSA include failure to thrive, cardiovascular strain (e.g., hypertension, cor pulmonale), and neurocognitive deficits.
• Adenotonsillectomy is the first-line treatment for most children with OSA secondary to adenotonsillar hypertrophy.
• Obesity is an increasingly significant risk factor for pediatric OSA, often requiring multidisciplinary management approaches including CPAP if surgery is insufficient or contraindicated.