Paediatric local anaesthetic toxicity

last local anaesthetic paediatric Apr 02, 2026

Local anaesthetics are used every day in paediatric care, often without issue. But when toxicity occurs, it can develop quickly and without much warning. In the perianaesthesia setting, early recognition is what keeps this complication from becoming life-threatening.

Local anaesthetic systemic toxicity happens when plasma levels of the drug rise too high. This may occur from accidental intravascular injection, excessive dosing, or rapid absorption from highly vascular areas. In children, smaller body mass and dosing variability increase the risk.

These medications affect both the central nervous system and the cardiovascular system. Initially, there may be excitatory signs as the brain becomes irritated. As toxicity progresses, this can shift into depression, leading to more serious complications such as seizures or cardiac instability.

  • 🧠 Early signs may include agitation, dizziness, or altered awareness
    • ⚡ Seizures can occur as toxicity progresses
    • 💓 Arrhythmias and bradycardia may develop
    • 🫁 Respiratory depression can follow CNS involvement
    • ⚠️ Cardiovascular collapse is a late and critical sign

For perianaesthesia nurses, subtle changes matter. A child who becomes suddenly restless, drowsy, or unstable after local anaesthetic use should always prompt further assessment.

Management focuses on stopping the local anaesthetic, calling for help, and supporting airway, breathing, and circulation. Early seizure management is essential. In severe cases, lipid emulsion therapy is used to bind circulating anaesthetic and reduce toxicity.

Preparation is key. Knowing safe dosing, recognising early signs, and being ready to act ensures safer care for paediatric patients.

Small changes can signal big problems. Noticing them early makes all the difference.

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References
StatPearls Publishing. (2023). Local Anaesthetic Toxicity.
Royal Children’s Hospital Melbourne. (n.d.). Local anaesthetic poisoning guideline.

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