A 48-year-old woman with a BMI of 34 kg/m² presents for pre-anesthetic evaluation before emergency cesarean section. She is a known case of gestational diabetes and has significant facial edema. On airway examination, when she opens her mouth fully and protrudes her tongue, only the hard palate is visible; the soft palate cannot be seen. Her thyromental distance is 5.5 cm, interincisor gap is 2.5 cm, and neck extension is limited due to edema. What is the predicted difficulty of intubation based on her airway assessment?
A. Difficult intubation expected; awake fiberoptic intubation strongly recommended
B. Moderate difficulty; have backup plan and consider awake fiberoptic intubation
C. Cannot be determined without computed tomography of the neck
D. Easy intubation expected; routine anesthesia induction recommended
Explanation
Comprehensive Airway Assessment in a Difficult Airway Scenario
This patient has multiple red flags for difficult intubation. A single unfavorable parameter warrants caution; multiple parameters demand a structured difficult airway plan.
Mallampati Classification in This Patient
Key Point
This patient has Mallampati Class IV — only the hard palate is visible. Class IV has a 50% incidence of difficult intubation and is a strong predictor of problematic laryngoscopy.
Cumulative Airway Risk Assessment
Table
Parameter
Finding
Risk Level
Mallampati
Class IV
Very High
Thyromental distance
5.5 cm
High (< 6 cm is difficult)
Interincisor gap
2.5 cm
High (< 3 cm is difficult)
Neck mobility
Limited extension
High (edema-related)
BMI
34 kg/m²
Moderate (obesity increases risk)
Facial edema
Present
High (airway compromise risk)
High-YieldNEET PG
When 3 or more unfavorable parameters are present, the incidence of difficult intubation rises sharply. This patient has 5 concurrent risk factors.
LEMON Score Interpretation
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Clinical Pearl
In obstetric emergencies (cesarean section), airway edema from pregnancy, preeclampsia, or gestational diabetes can worsen rapidly. Facial edema is a harbinger of laryngeal edema — a potentially catastrophic complication if not anticipated.
Mnemonic
DIFFICULT airway predictors:
Distance (thyromental < 6 cm)
Incisor gap (< 3 cm)
Facial edema or abnormality
Fluctuant neck mass
Immobility (neck)
Class (Mallampati III–IV)
Unusual anatomy
Large tongue
Trismus or TMJ dysfunction
Recommended Management
Awake fiberoptic intubation is strongly indicated because:
1.
Patient maintains spontaneous ventilation and airway reflexes
2.
Allows direct visualization of the larynx and vocal cords
3.
Reduces risk of aspiration and hypoxemia
4.
Permits assessment of laryngeal edema before induction
5.
Provides a controlled, reversible approach in an emergency obstetric case
Warning
Rapid sequence induction (RSI) with cricoid pressure is contraindicated in this patient. If intubation fails after induction, emergency surgical airway (cricothyrotomy) may be necessary — a high-morbidity outcome in obstetrics.
Tip
Have a difficult airway cart present, including:
Fiberoptic bronchoscope (tested and ready)
Bougie and multiple laryngoscope blades
Supraglottic airway devices
Emergency surgical airway kit
Senior anesthesiologist present during induction
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