## Mallampati Grade III: Clinical Significance **Key Point:** Mallampati Grade III represents moderate oropharyngeal obstruction and is associated with increased risk of difficult intubation, requiring additional airway assessment. ### Grade III Characteristics **High-Yield:** In Grade III Mallampati: - Only the **base of the uvula** is visible - The **soft palate is partially obscured** by the tongue - The tonsillar pillars and fauces are **not clearly visible** - This grade suggests **moderate difficulty** with intubation ### Clinical Implications 1. **Increased difficult airway risk** — Grade III and IV carry 5–10× higher risk than Grade I–II 2. **Requires supplementary assessment** — Thyromental distance, neck mobility, mouth opening, jaw protrusion 3. **Plan for difficult airway** — Consider awake fiberoptic intubation, videolaryngoscopy, or smaller endotracheal tube 4. **Anesthetic technique adjustment** — May warrant inhalational induction or topical anesthesia ### Mallampati Grading Summary | Grade | Visibility | Risk Level | |-------|------------|------------| | I | Soft palate, fauces, uvula, pillars | Low | | II | Soft palate, fauces, partial uvula | Low–Moderate | | III | Base of uvula only, soft palate obscured | Moderate–High | | IV | Hard palate only | High | **Clinical Pearl:** Grade III Mallampati is the **threshold for heightened airway vigilance**. Combined with other risk factors (obesity, short neck, limited neck extension, reduced mouth opening), it significantly increases the probability of difficult laryngoscopy (Cormack-Lehane Grade III–IV). **Warning:** Do not rely on Mallampati grade alone. Sensitivity and specificity are ~60–65% for predicting difficult intubation. Always perform a **multimodal airway assessment** including thyromental distance, interincisor distance, neck mobility, and jaw protrusion.
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