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Queckenstedt-Stookey test

compression of the jugular vein in a healthy person causes an increase in the pressure of the spinal fluid in the lumbar region within 10 to 12 seconds, and an equally rapid fall to normal on release of the pressure on the vein; when there is a block of subarachnoid channels, compression of the vein causes little or no increase of pressure in the cerebrospinal fluid.