Use of rapacuronium in a child with spinal muscular atrophy

Area of Science:

• Anesthesiology
• Neurology
• Pediatrics

Background:

• Spinal muscular atrophy (SMA) is a genetic neuromuscular disorder affecting motor neurons, leading to progressive muscle weakness.
• Anesthesia management in pediatric SMA patients presents unique challenges due to potential respiratory and bulbar muscle involvement.
• Nondepolarizing neuromuscular blocking agents (NDNMBA) are used in anesthesia, but their effects in SMA patients require careful consideration.

Observation:

• An 18-month-old girl with SMA experienced laryngospasm during anesthesia induction and received rapacuronium.
• Post-administration, diaphragmatic function showed recovery within 15 minutes, and adequate respiratory efforts were observed upon emergence.
• Diminished upper extremity muscle strength persisted, necessitating continued intubation until strength returned to baseline.

Findings:

• Train of four (TOF) monitoring during recovery was equivocal, indicating potential limitations in assessing neuromuscular blockade in SMA.
• Differential muscle group involvement in SMA can render standard TOF monitoring unreliable for predicting upper airway muscle function.
• This is the first reported instance of using an NDNMBA in a pediatric patient with SMA.

Implications:

• Careful clinical assessment and prolonged monitoring may be necessary for SMA patients recovering from anesthesia.
• Standard neuromuscular monitoring techniques might be insufficient in SMA, necessitating alternative assessment strategies.
• Further research is warranted to establish optimal anesthetic and monitoring protocols for pediatric SMA patients receiving neuromuscular blocking agents.