Lumbar anesthesia and epidural anesthesia difference

Lumbar anesthesia and epidural anesthesia both belong to spinal anesthesia, a kind of local anesthesia

Epidural anaesthesia is the injection of liquid medicine into the epidural space (the potential space between the dura and the ligamentum flavum) and the injection of diffused local anesthetics through the nerve roots of this space through the foramen. The dosage is 5 ~ 10 times larger than that of lumbar anesthesia, the effect is slow (15 ~ 20 minutes), no damage to the dura mater, no headache reaction after anesthesia. The epidural space is not connected with the cranial cavity, and the injection level can be as high as the cervical vertebra without paralyzing the life center of the medulla oblongata. If a catheter is inserted, repeated injections can prolong the time of anesthesia. Epidural anesthesia anesthetizes the sympathetic nerve, causing peripheral dilation and inhibition of the heart muscle, causing a drop in blood pressure.

Subarachnoid anaesthesia is the injection of local anesthetics into the subarachnoid space (a solid space between the arachnoid membrane and the pia mater, filled with cerebrospinal fluid) across the lumbar spine to block nerve roots in this area. As this space is connected to the ventricle of the brain, Excessive elevation of the anesthetic level will paralyze the vital center of the medulla oblongata, resulting in cardiac and respiratory arrest. When lumbar hemp, because sympathetic nerve is blocked, also often companion has blood pressure to drop, usable ephedrine prevents. In addition, as a result of the dural puncture, cerebrospinal fluid leakage, resulting in reduced pressure, easy to cause anesthesia headache. The specific gravity of the medication and the patient's position will affect the level of the medication, and if the medication is dissolved with released CEREBROspinal fluid, the specific gravity is higher than that of the cerebrospinal fluid. Dissolved with distilled water, the specific gravity is less than cerebrospinal fluid, high specific gravity for sitting patients, the solution to sink around the cauda equina, will be safe and effective.

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