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Henrikas Pranevicius

David S Liebeskind

Osvaldas Pranevicius

Mindaugas Pranevicius

Egidijus Marcinkevicius

A system for detecting and measuring increased global or local intracranial pressure includes various devices for performing controlled occlusion of jugular cranial blood outflow and generating occlusion data related to said controlled occlusion, a cranial blood outflow pressure measurement device and a processor for processing jugular cranial blood outflow occlusion data and cranial blood outflow data to identify and/or measure a functional relationship between the jugular controlled occlusion and the jugular cranial blood outflow pressure. A device communicates the functional relationship a display device and/or a patient monitoring system. The processor also detects a state of equilibrium between the jugular cranial blood outflow pressure and the jugular occlusion pressure at occlusion. In yet another embodiment, intracranial and extracranial vessel compliance is measured by NIRS system, the equilibrated using external compression bladder, and equilibrium bladder pressure is displayed as local intracranial pressure.

Noninvasive method to measure intracranial and effective cerebral outflow pressure

A method to measure effective cerebral outflow pressure or intracranial pressure is disclosed. The craniospinal venous system has multiple anastomoses between the jugular veins and vertebral venous plexus. Jugular veins collapse with cervical compression or head elevation, when extrinsic pressure exceeds venous pressure. The vertebral venous plexus is exposed to intracranial pressure and collapses when intracranial pressure exceeds venous pressure. Vertebral venous plexus is not compressed with head elevation or cervical compression, because enclosure in the spinal canal protects veins from the direct effects of atmospheric pressure and cervical compression. Using cervical compression and/or head elevation blood outflow is redistributed between jugular veins and vertebral venous plexus, while the degree of cervical compression or head elevation indicates effective cerebral outflow pressure or ICP.

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Kaunas, Lithuania

Henrikas Pranevicius