During a wake-up test for a Harrington rod procedure, four thumb twitches are present with the ulnar nerve stimulus, but the patient cannot move hands or feet after volatile anesthetic and nitrous oxide have been stopped for 10 minutes. The most appropriate intervention?

During a wake-up test for a Harrington rod procedure, four thumb twitches are present with the ulnar nerve stimulus, but the patient cannot move hands or feet after volatile anesthetic and nitrous oxide have been stopped for 10 minutes. The most appropriate intervention?

• A. 3 mg neostigmine plus 0.6 mg glycopyrrolate IV
• B. 20 µg naloxone IV
• C. 0.1 mg flumazenil IV
• D. Institute SSEP monitoring

Answer: (B)

The key idea is differentiating why a patient cannot move during a wake-up test. Four thumb twitches with the ulnar nerve indicate good neuromuscular recovery—there’s no meaningful residual nondepolarizing blockade. So the failure to move isn’t due to paralysis from NMBDs; it’s more likely due to ongoing CNS depression from analgesia, typically opioids, since volatile agents and nitrous oxide have already been stopped. Naloxone reverses opioid effects by competitively antagonizing opioid receptors, which can rapidly restore wakefulness and the ability to move, allowing an accurate wake-up assessment. This makes it the best intervention here. The other options don’t fit as well. Reversing neuromuscular blockade isn’t needed because there’s adequate neuromuscular recovery. Flumazenil would reverse benzodiazepines, but opioids are the more common culprit for delayed awakening in this scenario. SSEP monitoring is an additional monitoring modality, not an intervention to promote awakening.

The key idea is differentiating why a patient cannot move during a wake-up test. Four thumb twitches with the ulnar nerve indicate good neuromuscular recovery—there’s no meaningful residual nondepolarizing blockade. So the failure to move isn’t due to paralysis from NMBDs; it’s more likely due to ongoing CNS depression from analgesia, typically opioids, since volatile agents and nitrous oxide have already been stopped.

Naloxone reverses opioid effects by competitively antagonizing opioid receptors, which can rapidly restore wakefulness and the ability to move, allowing an accurate wake-up assessment. This makes it the best intervention here.

The other options don’t fit as well. Reversing neuromuscular blockade isn’t needed because there’s adequate neuromuscular recovery. Flumazenil would reverse benzodiazepines, but opioids are the more common culprit for delayed awakening in this scenario. SSEP monitoring is an additional monitoring modality, not an intervention to promote awakening.