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Titolo:
OTOACOUSTIC EMISSIONS - A NEW TOOL FOR MONITORING INTRACRANIAL-PRESSURE CHANGES THROUGH STAPES DISPLACEMENTS
Autore:
BUKI B; AVAN P; LEMAIRE JJ; DORDAIN M; CHAZAL J; RIBARI O;
Indirizzi:
FAC MED,DEPT BIOPHYS,POB 38 F-63001 CLERMONT FERRAN FRANCE FAC MED,DEPT BIOPHYS F-63001 CLERMONT FERRAN FRANCE SEMMELWEIS UNIV MED,DEPT EAR NOSE & THROAT H-1085 BUDAPEST HUNGARY FAC MED,DEPT NEUROSURG CLERMONT FERRAN FRANCE HOSP FONTMAURE CLERMONT FERRAN FRANCE
Titolo Testata:
Hearing research
fascicolo: 1-2, volume: 94, anno: 1996,
pagine: 125 - 139
SICI:
0378-5955(1996)94:1-2<125:OE-ANT>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
COCHLEAR AQUEDUCT; CEREBROSPINAL-FLUID; HAIR-CELLS; MIDDLE-EAR; RESPONSES; PERILYMPH; PATENCY; ORIGIN; REFLEX; MODEL;
Keywords:
INTRACRANIAL PRESSURE; INTRACOCHLEAR PRESSURE; STAPES, ANNULAR LIGAMENT; OTOACOUSTIC EMISSION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
73
Recensione:
Indirizzi per estratti:
Citazione:
B. Buki et al., "OTOACOUSTIC EMISSIONS - A NEW TOOL FOR MONITORING INTRACRANIAL-PRESSURE CHANGES THROUGH STAPES DISPLACEMENTS", Hearing research, 94(1-2), 1996, pp. 125-139

Abstract

Changes in hydrostatic intracranial pressure (ICP) are thought to be transmitted to cochlear liquids, thereby altering the mechanical load on the stapes footplate. Hence the stiffness of stapes' annular ligament is expected to reflect ICP changes. Corresponding middle-ear transmission changes have been assessed using click-evoked otoacoustic emissions (EOAE) in two experiments. The first one was performed in 22 normal human subjects submitted to posture changes. In the second one, controlled ICP increases were applied to 18 patients in neurosurgery operating theater. EOAEs were monitored in these subjects throughout the experiments and their phases and amplitudes were analyzed as a functionof frequency. ICP affected EOAEs in a systematic manner in both experiments, i.e., the main effect of ICP increase was a phase lead of EOAEcomponents below 2 kHz without any significant amplitude or frequencyshift. Their variations were much more evident than the modificationsin middle-ear impedance assessed by standard impedance or admittance measurements. The second experiment led to a quantitative linear relationship between ICP and EOAE phases. It demonstrated that the sensitivity of EOAE phase monitoring technique proves to be quite high, i.e., 55 daPa increases in ICP are readily detected in all subjects. The results are consistent with the predictions of classical middle-ear models as to the transmission alterations induced by ICP-related changes inthe stiffness of the annular ligament of the stapes. Non-invasive monitoring of ICP in patients with hydrocephalus treated with ventriculo-peritoneal shunts might be attempted with this technique, although it is restricted to patients with detectable EOAEs (i.e., about 50% in this series).

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 13:57:12