A 52-year-old male with severe rheumatoid arthritis and ankylosing spondylitis presents for elective lumbar spine fusion. Clinical examination reveals severely restricted cervical spine mobility, inability to open mouth beyond 2 cm, and a Mallampati score of IV. Routine induction with propofol and succinylcholine is contraindicated due to anticipated difficult airway. The anesthesiologist decides to perform awake fiberoptic intubation. Which of the following is the MOST appropriate initial step in the preparation for this procedure?

Explanation

## Preparation for Awake Fiberoptic Intubation **Key Point:** Topical anesthesia of the airway is the foundational first step in awake fiberoptic intubation, performed BEFORE systemic sedation or airway instrumentation. ### Sequence of Preparation Awake fiberoptic intubation requires a carefully orchestrated sequence: 1. **Topical anesthesia** (first priority) - 10% lidocaine spray to oropharynx and posterior pharynx - 4% lidocaine nebulized to larynx and trachea - Allows patient cooperation and suppresses airway reflexes - Performed in sitting or semi-sitting position 2. **Antisialagogue administration** (concurrent or after topical anesthesia) - Glycopyrrolate 0.4–0.6 mg IV or IM (preferred over atropine) - Reduces secretions that obscure fiberoptic view - Given 30–45 minutes before procedure if IM, or immediately if IV 3. **Gentle sedation** (after airway anesthesia is established) - Midazolam 0.5–1 mg IV titrated slowly - Remifentanil infusion (0.05–0.1 µg/kg/min) preferred in difficult airways - Maintains spontaneous ventilation and airway reflexes 4. **Fiberoptic scope insertion** (final step) **High-Yield:** Topical anesthesia MUST precede sedation. Sedating a patient without airway anesthesia risks loss of airway reflexes and aspiration. ### Why This Patient Needs Awake FOI - Ankylosing spondylitis → cervical fusion, severe restriction - Rheumatoid arthritis → TMJ involvement, limited mouth opening (2 cm) - Mallampati IV → predicted difficult intubation - Contraindicated for rapid sequence induction **Clinical Pearl:** In this scenario, the patient's restricted mouth opening (2 cm) is insufficient for conventional laryngoscopy but adequate for passage of a fiberoptic scope (outer diameter ~4.5 mm). ### Correct Sequence Rationale Option 1 (glycopyrrolate alone) is premature—antisialagogue must follow topical anesthesia. Option 3 (nasopharyngeal airway + sedation) skips topical anesthesia entirely and risks airway obstruction. Option 4 (supine, neck hyperextension) is contraindicated in ankylosing spondylitis (risk of spinal cord injury) and worsens visualization during fiberoptic intubation. **Option 2 is correct:** Topical anesthesia of the entire airway (spray + nebulized) is the essential first step, performed before sedation or instrumentation.