Related Experiment Videos
Myasthenia gravis in children and its anaesthetic implications
T C Brown1, R Gebert, O A Meretoja
1Royal Children's Hospital, Melbourne, Australia.
Insights
Pediatric myasthenia gravis patients typically resist suxamethonium but are sensitive to nondepolarizing relaxants. Careful neuromuscular monitoring is advised when using these agents in children with this rare neuromuscular disease.
Area of Science:
- Neurology
- Pediatrics
- Clinical Electrophysiology
Background:
- Myasthenia gravis is a rare autoimmune disorder affecting neuromuscular junctions, presenting diversely in pediatric populations.
- Understanding the varied etiology and clinical manifestations is crucial for effective management.
Purpose of the Study:
- To review the etiology and clinical presentations of myasthenia gravis in children.
- To present electromyography (EMG) findings in eight pediatric patients.
- To correlate EMG results with anesthetic drug responses.
Main Methods:
- Review of literature on pediatric myasthenia gravis etiology and presentation.
- Electromyography (EMG) studies in eight pediatric patients.
- Assessment of neuromuscular responses to suxamethonium and nondepolarizing relaxants.
Main Results:
- Most pediatric myasthenia gravis patients exhibited resistance to suxamethonium (ED95 3-4 times normal).
- Patients demonstrated sensitivity to nondepolarizing neuromuscular blocking agents.
- One patient with isolated ocular myasthenia gravis showed normal EMG responses in the hand.
Conclusions:
- Pediatric myasthenia gravis patients generally require higher doses of suxamethonium.
- Nondepolarizing relaxants necessitate cautious administration with vigilant neuromuscular monitoring in pediatric myasthenia gravis.
- Disease localization, such as ocular myasthenia gravis, may influence EMG findings.
Abstract:
Myasthenia gravis, a rare disease in children, occurs in a variety of forms. The aetiology and clinical presentations are reviewed. Eight patients who were studied with electromyography are presented. The results show that, in general, patients with the usual pattern of disease are resistant to suxamethonium (ED95 3-4 times normal) and are sensitive to nondepolarizing relaxants. When the latter are used it is advisable to administer small increments with neuromuscular monitoring. One patient with the disease localised to the eyelid had normal EMG responses when monitored on the hand with ulnar nerve stimulation.