What is meant by an epidural lumbar injection?

Epidural lumbar anesthesia is epidural lumbar anesthesia Difference between lumbar anesthesia and epidural lumbar anesthesia.

　　Epidural anaesthesia (epidural anaesthesia) is the injection of a medicinal solution into the epidural cavity (a potential cavity located between the dura mater and the ligamentum flavum) and the diffusion of local anesthetics to anesthetize the nerve roots that penetrate the intervertebral foramen in this cavity. The amount of drug used is 5 to 10 times greater than in lumbar anesthesia, with a slower onset of action (15 to 20 minutes), no damage to the dura mater, and no post-anesthetic headache reaction. The epidural cavity is not connected to the cranial cavity, and the level of drug injection can be as high as the cervical spine without paralyzing the medullary vital center. If a catheter is placed, repeated drug injections can prolong the anesthesia time. Epidural anesthesia can anesthetize the sympathetic nerves, resulting in peripheral vasodilation and myocardial depression, causing a decrease in blood pressure. The advantages of epidural anesthesia are that it can be administered continuously, the placement can be retained, the duration of anesthesia can be extended, and the chance of injury and infection can be reduced.

　　. Subarachnoid anaesthesia is referred to as lumbar anaesthesia. Local anesthetic is injected into the subarachnoid space (the solid space between the arachnoid and soft spinal membranes, filled with cerebrospinal fluid) through the lumbar space to block the nerve roots in the area, and because this space is connected to the ventricles, an excessive rise in the level of anesthesia will lead to paralysis of the medulla oblongata vital center, resulting in cardiac and respiratory arrest. During lumbar anesthesia, as the sympathetic nerves are blocked, there is often a drop in blood pressure, which can be prevented by ephedrine. In addition, because the dura mater is punctured, the cerebrospinal fluid leaks, causing a decrease in pressure, which can easily lead to post-anesthesia headache. The specific gravity of the drug and the patient's position will affect the level of the drug, such as using the released cerebrospinal fluid to dissolve the drug, the specific gravity is higher than that of the cerebrospinal fluid. If distilled water is used to dissolve, the specific gravity is less than that of the cerebrospinal fluid. High specific gravity fluid is used for sitting patients, and the drug sinks to around the cauda equina, which will be safe and effective.