Surgical Management of Sleep Apnea

OSA & Surgery - The Groundwork

• Obstructive Sleep Apnea (OSA): Recurrent upper airway collapse during sleep, causing hypoxemia & fragmented sleep.
• Surgical Candidacy Criteria:
  • CPAP failure or intolerance (most common).
  • Identifiable anatomical obstruction (e.g., tonsillar hypertrophy, retrognathia).
  • Patient preference after full counseling.
  • Moderate-Severe OSA (AHI ≥ 15) or Mild OSA (AHI 5-14) with significant symptoms/comorbidities (e.g., hypertension).
• Essential Pre-operative Evaluation:
  • Polysomnography (PSG): Confirms OSA diagnosis & severity (Apnea-Hypopnea Index - AHI).
  • Drug-Induced Sleep Endoscopy (DISE): Dynamically visualizes site(s) & pattern of airway collapse.

⭐ DISE is crucial for selecting appropriate surgical procedures by identifying specific levels of obstruction: velum, oropharyngeal lateral walls, tongue base, or epiglottis (VOTE classification).

Airway Opening Acts - Nose & Soft Palate

• Nasal Surgery: Aims to ↓ nasal airflow resistance & improve CPAP tolerance/efficacy.
  • Septoplasty: Corrects deviated nasal septum.
  • Turbinate Reduction: For hypertrophied turbinates (e.g., radiofrequency, microdebrider, partial resection).
  • Nasal Valve Repair: Addresses internal/external valve collapse.
  • Polypectomy: For nasal polyps.
  • Often adjunctive, rarely curative alone for OSA.
• Soft Palate Surgery: Addresses retropalatal collapse/obstruction.
  • Traditional Uvulopalatopharyngoplasty (UPPP):
    • Resects uvula, posterior soft palate margin, tonsils (if present).
    • Success: AHI ↓ >50% in ~40-60% selected patients.
    • Risks: Velopharyngeal insufficiency (VPI), dysphagia, globus sensation, nasopharyngeal stenosis.
  • Laser-Assisted Uvulopalatoplasty (LAUP): Staged, office procedure; generally less effective.
  • Radiofrequency Ablation (RFA) of Palate: Tissue volume reduction & stiffening.
  • Palatal Implants (Pillar®): Polyester rods stiffen soft palate.
  • Modern Pharyngoplasties: (e.g., Expansion Sphincter Pharyngoplasty, Z-Palatoplasty, Barbed Reposition Pharyngoplasty) aim for more physiologic airway expansion.

⭐ UPPP success hinges on careful patient selection, particularly identifying retropalatal obstruction without significant tongue base collapse if UPPP is the sole procedure.

Tongue Tied No More - Base & Bones

Targets hypopharyngeal obstruction via tongue base reduction or skeletal framework expansion.

• Tongue Base Procedures:
  • Midline Glossectomy/Lingualplasty: Reduces posterior tongue volume.
  • Lingual Tonsillectomy: For lingual tonsil hypertrophy.
  • Radiofrequency Ablation (RFABT): Shrinks tongue base tissue.
  • Genioglossus Advancement (GGA): Advances tongue base by moving genial tubercle.
  • Hyoid Suspension (HS): Elevates and stabilizes hyoid bone, indirectly pulling tongue base anteriorly.
• Skeletal Procedures:
  • Maxillomandibular Advancement (MMA): Highly effective; enlarges entire upper airway. Success >90%.

    ⭐ MMA is the most effective surgical option for OSA, expanding the velo-oro-hypopharyngeal airway by advancing both jaws.

  • Genioplasty: Anterior chin movement; may improve airway.

Beyond the Knife - Nerves & New Tech

• Hypoglossal Nerve Stimulation (HGNS):
  • Mechanism: XII N. stimulation → genioglossus contracts → ↑airway patency.
  • Indications: Mod-Sev OSA, CPAP failure/intolerance, BMI < 32-35 kg/m².
  • Contraindication: Complete concentric collapse (CCC) at velopharynx on DISE.
• Tracheostomy:
  • Definitive; bypasses entire upper airway obstruction.
  • Indications: Severe OSA, failed therapies, craniofacial anomalies.
  • Risks: Stenosis, infection, bleeding, fistula.
• General Post-Op Care & Risks:
  • Airway monitoring, pain relief.
  • Complications: Bleeding, infection, nerve injury.
  • Follow-up PSG; CPAP may still be required.

⭐ HGNS is contraindicated by complete concentric collapse (CCC) of the velopharynx on drug-induced sleep endoscopy (DISE).

High‑Yield Points - ⚡ Biggest Takeaways

• Uvulopalatopharyngoplasty (UPPP) is a common surgery for palatal obstruction in OSA; success rates vary.
• Genioglossus advancement (GA) specifically targets tongue base collapse by pulling the tongue forward.
• Maxillomandibular advancement (MMA) is highly effective for severe OSA, significantly enlarging the entire velo-oro-hypopharyngeal airway.
• Tracheostomy remains the definitive treatment for life-threatening or refractory severe OSA, bypassing all upper airway obstruction.
• Drug-Induced Sleep Endoscopy (DISE) is crucial for identifying the precise level(s) and pattern of airway obstruction to guide surgical selection.
• Hypoglossal nerve stimulation (HNS) is a newer, implant-based therapy for moderate to severe OSA, improving upper airway muscle tone during sleep.