Regional Anesthesia in Patients with Hepatic Failure: How Risky is it to Administer Local Anesthetic?

Area of Science:

• Anesthesiology
• Hepatology
• Pharmacology

Background:

• Advanced liver disease presents complex challenges for anesthesiologists, particularly regarding regional anesthesia.
• Comorbidities like coagulopathy, encephalopathy, and sepsis significantly complicate patient care.
• Liver failure alters drug metabolism, increasing the unbound fraction and effective exposure to amide local anesthetics.

Purpose of the Study:

• To provide a practical pathway for selecting regional anesthesia techniques and agents for patients with hepatic failure.
• To outline safe dosing and administration strategies for local anesthetics in this patient population.
• To emphasize preparedness for local anesthetic systemic toxicity (LAST).

Main Methods:

• Review of physiological changes in liver failure affecting local anesthetic pharmacokinetics.
• Discussion of risks associated with neuraxial versus peripheral nerve blocks.
• Emphasis on ultrasound guidance, incremental injection, and conservative dosing strategies.
• Recommendations for catheter management and LAST preparedness.

Main Results:

• Superficial peripheral blocks are generally safer than deep plexus targets in patients with coagulopathy.
• Ultrasound guidance, incremental injections, and conservative dosing are key safety measures.
• Regional anesthesia is feasible with adjusted doses and techniques, alongside routine LAST preparedness.

Conclusions:

• Regional anesthesia can be safely administered to patients with hepatic failure by adjusting dose and technique to disease biology.
• Meticulous attention to local anesthetic dosing, administration, and preparedness for LAST is essential.
• A practical pathway aids in selecting appropriate blocks, agents, and doses to ensure a safety margin.