Which pharmacologic agent is commonly used for field analgesia that preserves airway reflexes?

• A. Morphine
• B. Ketamine
• C. Fentanyl
• D. Midazolam

Answer: (B)

Preserving airway reflexes while providing effective analgesia in the field relies on using an agent that does not significantly depress breathing or motor control of the airway. Ketamine fits this role because it provides analgesia and a dissociative state without causing the airways to relax or the patient to stop breathing. It also tends to maintain spontaneous ventilation and can even bronchodilate, which is helpful in trauma and respiratory-prone conditions.

In contrast, opioids like morphine and fentanyl blunt the respiratory center and can reduce airway protective reflexes, increasing the risk of hypoventilation or airway compromise in field settings. A benzodiazepine such as midazolam sedates but does not provide meaningful analgesia and can further depress respiration, especially if combined with other depressants. Because of these factors, ketamine is the best choice for field analgesia when keeping airway reflexes intact is important.