What is the role of neuromuscular blockade in mechanical ventilation?

• A. Long-term sedation management
• B. Short-term to improve synchrony or reduce oxygen consumption in severe ARDS; monitor using train-of-four
• C. To prevent coughing during bronchoscopy
• D. To increase airway resistance

Answer: (B)

Neuromuscular blockade in mechanical ventilation is used short-term to improve how well the patient’s breathing shapes match the ventilator and to lower the patient’s work and oxygen consumption when the lungs are severely damaged, as in ARDS. By relaxing the respiratory muscles, the ventilator can deliver breaths more predictably, helping to achieve protective lung strategies with low tidal volumes and controlled pressures. Because this paralysis is temporary, adequate sedation and analgesia are essential so the patient is comfortable and not aware of the paralysis.

To use it safely, clinicians monitor depth of blockade with a train-of-four test, adjusting the dose to keep enough blockade to prevent movement and dyssynchrony but avoid prolonged paralysis. This is not a long-term sedation solution, and it doesn’t increase airway resistance.