Epidural anaesthesia provides analgesia for which region?

• A. All procedures caudal to the thoracolumbar junction
• B. All procedures cephalad to the thoracolumbar junction
• C. Only obstetric analgesia
• D. Only lumbar procedures

Answer: (A)

Epidural anaesthesia works by placing local anaesthetic into the epidural space so it blocks the nerve roots as they exit the spinal cord. The spread of the drug within that space is variable, but with typical doses the block tends to extend downward to involve the lumbar and sacral nerve roots. This means analgesia is provided for regions caudal to the thoracolumbar junction—namely the lumbar, pelvic, perineal areas and hind limbs. It is ideal for procedures in these regions, rather than reliably covering areas above the thoracolumbar junction. While obstetric use is common, epidurals are not limited to obstetrics and can be used for many lower-body procedures.