Local anaesthetic plasma levels in children

Area of Science:

• Anesthesiology
• Pediatric Pharmacology
• Clinical Toxicology

Background:

• Lignocaine and bupivacaine are commonly used local anesthetics in pediatric procedures.
• Understanding their pharmacokinetic profiles in children is crucial for safe administration.
• Previous studies have indicated varying absorption rates depending on the route of administration.

Purpose of the Study:

• To quantify blood lignocaine and bupivacaine levels in pediatric patients following different administration routes.
• To assess the safety of these local anesthetics in children by comparing blood concentrations to established toxic levels.
• To identify potential risk factors, such as age, influencing anesthetic blood levels.

Main Methods:

• Children received caudal, subcutaneous, or tracheal administration of lignocaine and bupivacaine.
• Serial blood samples were collected to measure drug concentrations.
• Peak blood levels were analyzed in relation to administration route and patient age.

Main Results:

• Highest peak blood concentrations of lignocaine and bupivacaine were observed in children under 3 years of age following tracheal spray.
• Despite the higher peak levels in this subgroup, all measured blood concentrations remained below the accepted toxic levels for anesthetized adults.
• No clinical signs or symptoms of local anesthetic toxicity were observed in any of the pediatric patients.

Conclusions:

• Caudal, subcutaneous, and tracheal administration of lignocaine and bupivacaine appear safe in the studied pediatric population.
• Age is a significant factor, with younger children potentially exhibiting higher peak blood levels after tracheal administration.
• The observed blood levels suggest a wide safety margin for these anesthetics in children under typical clinical conditions.