Is a lumbar puncture the bone marrow?

Lumbar puncture is one of the commonly used clinical examination methods in neurology. It can be used to detect intracranial pressure and cerebrospinal fluid in cases of central high fever, acute ischemic brain injury, cardiac arrest, heat stroke, and high intracranial pressure. nature. Some patients think that the bone marrow is taken out by lumbar puncture, and they are worried that they will be anemia after the examination. In fact, lumbar puncture removes a small amount of cerebrospinal fluid in the central canal of the spinal cord, which has no effect on bones and blood.

Cerebrospinal fluid is a colorless and transparent liquid that fills the ventricles, the subarachnoid space and the central canal of the spinal cord. It has protective, supportive and nutritional effects on the brain and spinal cord. Cerebrospinal fluid is produced in the choroid plexus of each ventricle, mainly the choroid plexus of the lateral ventricle. The average adult cerebrospinal fluid is 150 milliliters, and the rate of production is 0.3 to 0.5 milliliters per minute, which is about 500 milliliters per day. Almost all of the cerebrospinal fluid produced by the human body is absorbed by the human body and reaches a state of equilibrium. Lumbar puncture usually only extracts a few milliliters to a dozen milliliters of cerebrospinal fluid, which has little effect on the human body.

Bone marrow is the hematopoietic tissue of the human body and is present in the bones. Bone marrow has the functions of hematopoiesis, wound repair, and nutrition of bone. Formally, cerebrospinal fluid is fluid, while bone marrow is soft tissue.

During a lumbar puncture examination, the patient lies on the examination table with his back to the doctor, flexes his head forward, hugs his knee, makes the lumbar kyphosis and fully exposes the puncture site. Such a posture can not only reduce the puncture time but also increase the puncture success rate. After positioning is completed, the doctor will sterilize it, inject a local anesthetic, and insert a needle into the lumbar spine to drain the cerebrospinal fluid. During this process, the medical staff will observe the patient's breathing, pulse, and complexion changes at any time, and ask the patient whether they feel discomfort at any time. After a successful puncture, the doctor will take a sample of cerebrospinal fluid.

After the puncture, the patient needs to remove the pillow and lie flat for 4 to 6 hours. During the bed rest, the head cannot leave the bed surface, and the body can be turned appropriately. If you still have a headache after getting up, drink plenty of fluids and stay in bed longer.

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