Local and Regional Anesthesia – BCSE Study Guide

Overview and Clinical Importance

Local and regional anesthesia represents one of the most powerful tools in veterinary pain management. By blocking sodium channels in peripheral nerves, local anesthetics provide complete interruption of nociceptive transmission, offering profound analgesia that cannot be matched by systemic analgesics alone. These techniques reduce inhalant anesthetic requirements, minimize systemic drug exposure, and provide extended postoperative pain control.

On the BCSE, expect questions covering local anesthetic pharmacology (mechanism, onset, duration, toxic doses), specific nerve block techniques (dental, limb, epidural), and recognition and treatment of local anesthetic systemic toxicity (LAST). This domain integrates with pharmacology, anatomy, and surgery content.

Section 1: Local Anesthetic Pharmacology

Mechanism of Action

Local anesthetics block voltage-gated sodium channels in neuronal membranes, preventing depolarization and action potential propagation. This blocks both sensory (pain) and motor nerve transmission when used at appropriate concentrations.