## Mallampati Classification and Common Causes **Key Point:** Mallampati Grade III–IV (poor visualization of pharyngeal structures) is most frequently encountered in obese patients due to increased soft tissue mass in the neck and oropharynx, which reduces the intraoral space and obscures the view of posterior pharyngeal structures. ### Why Obesity is the Most Common Cause Obesity leads to: - Increased neck circumference and soft tissue bulk - Reduced pharyngeal space and compliance - Increased risk of difficult intubation and obstructive sleep apnea - Direct mechanical obstruction of the view during Mallampati assessment **Clinical Pearl:** In the Indian population, rising obesity rates have made this the leading cause of poor Mallampati grades in routine preoperative airway assessment. Patients with BMI >30 kg/m² are at significantly higher risk. ### Mallampati Grading Reminder | Grade | Structures Visible | Clinical Significance | |-------|-------------------|----------------------| | I | Soft palate, fauces, uvula, anterior and posterior pillars | Easy intubation | | II | Soft palate, fauces, uvula | Easy intubation | | III | Soft palate, base of uvula | Moderate difficulty | | IV | Hard palate only | Difficult intubation | **High-Yield:** Mallampati Grade III–IV + obesity + short neck + limited mouth opening = **difficult airway**. This triad is tested frequently in NEET PG. ### Why Other Options Are Less Common - **Dental malocclusion/micrognathia:** Congenital or developmental; much rarer in the general population. - **Acute infections (epiglottitis, abscess):** Emergency presentations, not routine preoperative findings. - **Laryngeal papillomatosis:** Rare benign neoplasm; not a common cause of poor Mallampati grades. **Mnemonic:** **OBESE** = Oropharyngeal Bulk Enlargement Severely Eases difficulty — the most common modifier of Mallampati grade.
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