The term epidural is a simplified and all-inclusive term often used to refer to techniques such as epidural analgesia and epidural anaesthesia. The epidural route is frequently employed by certain physicians and nurse anaesthetists to administer diagnostic (e.g. radiocontrast agents) and therapeutic (e.g., glucocorticoids) chemical substances, as well as certain analgesic and local anaesthetic agents. Epidural techniques frequently involve injection of drugs through a catheter placed into the epidural space. The injection can result in a loss of sensation—including the sensation of pain—by blocking the transmission of signals through nerves in or near the spinal cord.
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