Ophthalmodynamometry. A reliable method for noninvasive measurement of intracranial pressure

Background. Central vein pressure depends on intracranial pressure (ICP). B aurmann in 1925 therefore recommended measuring central vein pressure to de termine ICP, but the accuracy of this method has not yet been verified. To test the method we measured venous outflow pressure (VOP) by noninvasive op hthalmodynamometry (ODM). Methods and materials. We studied 31 patients with suspected increased ICP. ICP was recorded continuously for a minimum of 24 h by intraventricular ca theters, and ODM was performed during ICP measurement. The findings were co mpared with the results of conventional invasive ICP measurement. Results. Pressure in the central retinal vein was highly correlated with IC P. Conclusion. Measuring VOP by ODM seems to be a reliable method for nonin vasive recording of ICP. It is a useful screening test in all cases of pres umed ICP elevation.