Under what circumstances is the neck compression test prohibited during lumbar puncture?

The mechanism of the neck compression test is that when the jugular vein is compressed and the intracranial venous return is blocked, the intracranial pressure increases suddenly, and the pressure must be quickly reflected by the cerebrospinal fluid on the manometry tube or pressure gauge connected to the lumbar puncture needle. Normal pressure also sees a corresponding rise. After the compression is relieved, the pressure decreases.

  This can help to understand whether the subarachnoid space of the brain and spinal cord is unobstructed, and whether the intracranial venous sinus is blocked. Operation method: ①Hand pressure method: lumbar puncture, indwelling puncture needle and pressure measuring tube, then use both hands to compress the jugular veins on both sides for 10 seconds to record the pressure rise; after decompressing for 10 seconds, record the pressure drop.

    To test whether the lateral sinus is blocked, one side of the jugular vein can be compressed successively, the above pressure changes can be observed, and the two sides can be compared. ②The air bag compression method of the neck blood pressure watch: wrap a blood pressure air bag around the patient's neck and install the blood pressure watch. The surgeon performed lumbar puncture according to the above procedures. Determination of initial pressure, first pressure neck

The test, such as patency, confirms that the needle is completely within the subarachnoid space.

  Then quickly inflate to 2.6kPa (20mmHg), and then record the increase of cerebrospinal fluid pressure level 1 time in 5 seconds until it no longer rises. After that, deflate quickly, remove neck pressure, and record the drop level of cerebrospinal fluid pressure every 5 seconds until it does not drop any more.

  Then use the same method to inflate the sphygmomanometer to 5.3kPa (40mmHg) and 8.0kPa (60mmHg) respectively, measure the change of cerebrospinal fluid pressure, take the time as the abscissa and the pressure value as the ordinate, and trace the pressure change curve.

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