title: Continuous recording of changes in intracranial pressure using interference echoes of ultrasonic wave: a preliminary report of practicality and clinical evaluation.
abstract: We attempted to examine intracranial pressure (ICP) noninvasively using probes receiving interference echoes of ultrasound from thin layers between the skull and the surface of the cerebrum. The reception of echo through bone flaps less than 5-mm thick was good. Normal adults (4) and patients (4) were examined by attaching ultrasound probes to the frontotemporal scalp. Recordings were performed during rest, Valsalva maneuver, hyperventilation, and pumping of a shunt-flushing device. Ultrasound recordings of ICP were compared with those of the scalp using two different time windows. The effect of scalp vessels on the ultrasound recordings of ICP was evaluated. The waves from a pressure transducer and the ultrasound probe were similar. This method was found to be useful for ICP recording.
authors.affiliation: Department of Neurosurgery, Nagoya University School of Medicine, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Kuchiwaki
authors.forename: S
authors.initials: S
authors.lastname: Inao
authors.forename: K
authors.initials: K
authors.lastname: Andoh
authors.forename: J
authors.initials: J
authors.lastname: Itoh
authors.forename: N
authors.initials: N
authors.lastname: Sakuma
authors.forename: T
authors.initials: T
authors.lastname: Takishita
authors.forename: Y
authors.initials: Y
authors.lastname: Ogura
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000818:Animals; D002557:Cerebrospinal Fluid Shunts; D004285:Dogs; D004388:Dura Mater; D005069:Evaluation Studies as Topic; D005354:Fibrosarcoma / Q000000981:diagnostic imaging; D006801:Humans; D006849:Hydrocephalus / Q000000981:diagnostic imaging; D007427:Intracranial Pressure; D008297:Male; D008577:Meningeal Neoplasms / Q000000981:diagnostic imaging; D008579:Meningioma / Q000000981:diagnostic imaging; D008875:Middle Aged; D009918:Orbital Neoplasms / Q000000981:diagnostic imaging; D011187:Posture; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation; D012886:Skull / Q000000981:diagnostic imaging; D016683:Supine Position; D014463:Ultrasonography / Q000295:instrumentation / Q000379:methods; D014636:Valsalva Maneuver