Objective: We wished to determine serum lidocaine concentrations after subcutaneous injection during cardiac catheterization.
Method: Serum lidocaine concentrations were measured in 50 patients during catheterization.
Results: Serum concentration was linearly related to dose per kilogram of body weight. Lidocaine concentrations were therapeutic in 38% of patients.
Conclusion: Lidocaine dose must be considered when the drug is used for local anesthesia in children.