Intracranial Pressure: A Comparison of the Noninvasive HeadSense Monitor versus Lumbar Pressure Measurement.

OBJECTIVE:To compare a new method of noninvasive intracranial pressure (nICP) measurement with conventional lumbar puncture (LP) opening pressure. METHODS:In a prospective multicenter study, patients undergoing LP for diagnostic purposes underwent intracranial pressure measurements with HeadSense, a noninvasive transcranial acoustic device, and indirectly with LP. Noninvasive measurements were conducted with the head in a 30° tilt and in supine position before and after LP. The primary endpoint was the correlation between nICP measurement in supine position before LP and the LP opening pressure. RESULTS:There was no correlation between supine nICPs before LP and the LP opening pressures (r = -0.211, P = 0.358). The 30° head-tilt nICPs correlated with the supine nICPs before LP (r = 0.830, P < 0.01). There was no correlation between supine nICPs before and after LP (r = 0.056, P = 0.831) or between 30° head-tilt nICPs and LP opening pressures (r = -0.038, P = 0.861). CONCLUSIONS:There was no correlation between nICPs and LP opening pressures. Further development is warranted before transcranial acoustic HeadSense can become a clinical tool for investigating patients with neurologic conditions.