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Summary
High doses of lidocaine can cause symptomatic hypoglycemia, particularly in patients with cardiac insufficiency. Monitoring blood glucose and administering glucose may be necessary for patients experiencing toxic reactions to lidocaine.
Area of Science:
- Anesthesiology
- Cardiology
- Endocrinology
Background:
- Lidocaine is a common local anesthetic and antiarrhythmic drug.
- Cardiac insufficiency and hepatic metabolism can influence drug effects.
- Systemic toxicity from lidocaine can occur with high doses.
Observation:
- Four patients with cardiac insufficiency developed symptomatic hypoglycemia after high-dose lidocaine administration before surgery.
- Six of 12 patients undergoing pacemaker implantation under local anesthesia with lidocaine also showed reduced blood glucose levels.
Findings:
- Lidocaine administration can lead to a clinically significant decrease in blood glucose levels.
- The interaction between hepatic glucose metabolism and lidocaine metabolism is a potential cause for this hypoglycemic effect.
Implications:
- Blood glucose monitoring is recommended for patients experiencing systemic toxic reactions to lidocaine.
- Intravenous glucose administration may be beneficial in managing lidocaine-induced hypoglycemia.
- This finding suggests a need for careful patient selection and monitoring when using high-dose lidocaine, especially in cardiac patients.