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[Dose limits for local anesthetics. Recommendations based on toxicologic and pharmacokinetic data]
1Anaesthesie-Abteilung, St. Marien- und St. Annastiftskrankenhaus, Ludwigshafen/Rh.
Regional-Anaesthesie
|August 1, 1991
Summary
Local anesthetic toxicity is not adequately addressed by current dosage limits. New recommendations consider administration technique and pharmacokinetic data for safer use of local anesthetics with adrenaline.
Area of Science:
- Pharmacology
- Anesthesiology
Context:
- Adrenaline has been used with local anesthetics since 1903 to enable clinical application.
- Current maximum dose recommendations for local anesthetics do not account for administration technique or specific pharmacokinetic and toxicological data.
- The assumption that adrenaline universally lowers local anesthetic toxicity is being re-evaluated.
Purpose:
- To propose revised maximum dose recommendations for local anesthetics based on administration technique.
- To highlight the importance of pharmacokinetic and toxicological data in determining safe local anesthetic dosages.
- To emphasize the need for technique-specific safety protocols in regional anesthesia.
Summary:
- Established maximum dose recommendations for local anesthetics, often combined with adrenaline, fail to consider critical factors.
- These factors include the influence of regional anesthesia techniques on blood concentration levels and the increased toxicity risk associated with inadvertent intravascular injection.
- A new categorization for maximum dose recommendations is suggested, varying by injection technique (subcutaneous, high absorption areas, single vs. protracted, vasoactive regions).
Impact:
- Revised dosage guidelines can enhance patient safety during local anesthesia procedures.
- This approach promotes a more nuanced understanding of local anesthetic toxicity and pharmacokinetics.
- It encourages the selection of appropriate administration techniques and concomitant monitoring strategies for regional anesthesia.