Epidural administration is a technique in which medications are injected into the epidural space surrounding the spinal cord, often through a catheter that can remain for the duration of treatment. First deliberately described in 1921 by Spanish surgeon Fidel Pagés, epidurals are now central to modern anesthesia and pain management. They deliver local anesthetics, opioids, steroids, or diagnostic agents directly near spinal nerves, blocking pain signals from specific regions of the body while often preserving muscle control and consciousness.
Epidural analgesia is especially common in childbirth, where it offers more effective pain relief than oral or intravenous opioids and reduces the need for newborn resuscitation drugs like naloxone. It may modestly lengthen labor and increase the need for oxytocin, and can cause fever, low blood pressure, or muscle weakness, but does not increase Caesarean rates or harm long‑term maternal or neonatal health. Epidurals are also used after major surgeries to reduce systemic opioid use and complications such as respiratory problems, chest infections, and heart attacks. Steroid injections treat radicular pain from spinal disorders, and epidural blood patches seal dural leaks causing severe headaches.
Contraindications include infection near the site, coagulopathy, some cardiac conditions, and progressive neurological disease. Complications range from post‑dural‑puncture headache and bloody tap to extremely rare abscess, hematoma, paraplegia, or death. Technique requires precise needle placement using anatomic landmarks, loss‑of‑resistance testing with air or saline, and sometimes imaging guidance. Since the late 19th century, refinements such as continuous catheters and combined spinal‑epidural methods have turned epidurals into a cornerstone of regional anesthesia worldwide, though access remains uneven across countries and social groups.
