Spinal anesthesia (also known as lumbar anesthesia) and peridural anesthesia (also known as epidural anesthesia) are central loco-regional anesthesia that are indicated in operations on the legs, pelvis, and lower abdomen (cesarean section, inguinal hernias, etc.). A local anesthetic (locally numbing drug) is injected into the cerebrospinal fluid (in spinal anesthesia), or into the epidural space existing outside the meninges (epidural or peridural anesthesia).
In doing so, after a few minutes the lower parts of the body become warm at first, then numb and immobile. The duration of anesthesia varies depending on the type of medicine used and can range from 45 minutes to a few hours.
During the procedure the patient may be put to sleep by administration of medication, may listen to music through earphones, or may remain fully awake and alert.