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EASUREMENTS of the spinal-fluid pressure by means of lumbar puncture in cases of acute injury of the head have been repol~ed and the value of such measurements has been discussed by Russell, 17 Munro, 13 Busch, 2 Rowbotham 16 and several other investigators. 1,5 In order to study intracranial dynamics, Ryder et al. TM recorded the spinal-fluid pressure continuously in a few patients with acute injury of the brain. The cerebrospinal-fluid pressure has also been measured in animals after experimentally induced trauma to the head. 3,1~,2~ Obvious interest has thus been shown in the changes of intracranial pressure in traumatic injury of the brain. However, no attempts have been made, either experimentally or clinically, to study, by continuous recording, the variations of this pressure during the acute stage. On the whole, present-day treatment of posttraumatic intracranial hypertension is based on rather fragmentary knowledge. In our department continuous recording of the ventricular-fluid pressure has been used routinely for several years in a total number of 368 nontraumatic eases of intracranial hypertension. In our experience TM the technique has proved to be safe and we have found considerable practical value in controlling the ventricular-fluid pressure. On this basis we decided to use continuous control of the ventricular-fluid pressure in eases of traumatic injury of the brain. This is a preliminary report on the first 30 patients, illustrated by a few representative cases. The recording time ranged between 1

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