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  • 51.
    Tribukait, Arne
    et al.
    Karolinska Hospital.
    Rosenhall, U.
    Directional sensitivity of the human macula utriculi based on morphological characteristics2001Inngår i: Audiology & neuro-otology, ISSN 1420-3030, E-ISSN 1421-9700, Vol. 6, nr 2, s. 98-107Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A morphometric analysis of 43 human maculae utriculi is presented. Individual data on the shape, total area and relative area of the pars interna are given. In addition, the sensitivity of the entire macula to shear stimuli in different directions was estimated. The mean area of 39 maculae from adults and children was 4.30 +/- 0.30 (SD) mm(2). The pars interna was slightly but significantly smaller than the pars externa. The interindividual variability was larger for the shape of the macula than for the total area and the percentage of the pars interna. The estimated responsiveness of the macula was largest for shear directed anteromedially and smallest for shear directed posteriorly. The data are discussed taking into consideration clinical findings on patients with unilateral loss of otolith function.

  • 52.
    Tribukait, Arne
    et al.
    Karolinska Hospital.
    Rosenhall, Ulf
    Osterdahl, Bengt
    Morphological characteristics of the human macula sacculi2005Inngår i: Audiology & neuro-otology, ISSN 1420-3030, E-ISSN 1421-9700, Vol. 10, nr 2, s. 90-96Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The surface morphology of 20 human maculae sacculi is presented. Individual data on the total area, shape and the relative area of the pars superior are given. The mean area of 14 adult maculae was (mean +/- SD) 2.35 +/- 0.31 mm2. The ratio between the length and width of the macula was 2.54 +/- 0.28. The pars superior was significantly larger than the pars inferior. The percentage of pars superior was 56.4 +/- 4.7. As regards the shape of the macula, there was a large interindividual variability. The findings are discussed, taking into consideration comparative anatomy as well as spatial orientation.

  • 53.
    Tribukait, Arne
    et al.
    KTH, Skolan för teknik och hälsa (STH), Naturvetenskap och biomedicin, Omgivningsfysiologi.
    Ström, A
    Bergsten, Eddie
    Eiken, Ola
    KTH, Skolan för teknik och hälsa (STH), Naturvetenskap och biomedicin, Omgivningsfysiologi.
    Vestibular Stimulus and Perceived Roll Tilt During Coordinated Turns in Aircraft and Gondola Centrifuge2016Inngår i: Aerospace Medicine and Human Performance, ISSN 2375-6322, Vol. 87, nr 5, s. 454-463Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    BACKGROUND: One disorienting movement pattern, common during flight, is the entering of a coordinated turn. While the otoliths persistently sense upright head position, the change in roll attitude constitutes a semicircular canal stimulus. This sensory conflict also arises during acceleration in a swing-out gondola centrifuge. From a vestibular viewpoint there are, however, certain differences between the two stimulus situations; the aim of the present study was to elucidate whether these differences are reflected in the perceived roll attitude.METHODS: Eight nonpilots were tested in a centrifuge (four runs) and during flight (two turns). The subjective visual horizontal (SVH) was measured using an adjustable luminous line in darkness. The centrifuge was accelerated from stationary to 1.56 G (roll 50°) within 7 s; the duration of the G plateau was 5 min. With the aircraft, turns with approximately 1.4 G (45°) were entered within 15 s and lasted for 5 min. Tilt perception (TP) was defined as the ratio of SVH/real roll tilt; initial and final values were calculated for each centrifugation/turn.RESULTS: In both systems there was a sensation of tilt that declined with time. The initial TP was (mean ± SD): 0.40 ± 0.27 (centrifuge) and 0.37 ± 0.30 (flight). The final TP was 0.20 ± 0.26 and 0.17 ± 0.19, respectively. Both initial and final TP correlated between the two conditions.CONCLUSION: The physical roll tilt is under-estimated to a similar degree in the centrifuge and aircraft. Also the correspondence at the individual level suggests that the vestibular dilemma of coordinated flight can be recreated in a lifelike manner using a gondola centrifuge.

  • 54. Verrecchia, L
    et al.
    Brantberg, K
    Tribukait, Arne
    KTH, Skolan för teknik och hälsa (STH), Omgivningsfysiologi.
    Gennser, Mikael
    KTH, Skolan för teknik och hälsa (STH), Omgivningsfysiologi.
    Partial labyrinthine injury in severe decompression illness: a vascular embolic explanation?2010Konferansepaper (Fagfellevurdert)
  • 55. Verrecchia, L
    et al.
    Tribukait, Arne
    KTH, Skolan för teknik och hälsa (STH), Omgivningsfysiologi.
    Gennser, Mikael
    KTH, Skolan för teknik och hälsa (STH), Omgivningsfysiologi.
    Brantberg, K
    Perifer övre segmental vestibulär pares vid svår dekompressionssjuka: finns vaskulär embolisk orsak?2010Konferansepaper (Fagfellevurdert)
  • 56. Verrecchia, Luca
    et al.
    Gennser, Mikael
    KTH, Skolan för teknik och hälsa (STH), Omgivningsfysiologi.
    Tribukait, Arne
    KTH, Skolan för teknik och hälsa (STH), Omgivningsfysiologi.
    Brantberg, Krister
    Superior Vestibular Dysfunction in Severe Decompression Sickness Suggests an Embolic Mechanism2012Inngår i: Aviation, Space and Environmental Medicine, ISSN 0095-6562, E-ISSN 1943-4448, Vol. 83, nr 11, s. 1097-1100Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    VERRECCHIA L, GENNSER M, TRIBUKAIT A, BRANTBERG K. Superior vestibular dysfunction in severe decompression sickness suggests an embolic mechanism. Aviat Space Environ Med 2012; 83:1097-1100. Background: Both nitrogen bubble embolism and the difficulty of inner ear tissues to wash out nitrogen have been discussed as possible reasons for the selective vulnerability of the inner ear to decompression illness. This case report suggests that nitrogen bubble embolism plays a crucial role in the pathogenesis of inner ear lesions in decompression accidents. Case Report: The current patient, a 48-yr-old male dive master, suffered a severe decompression illness with vertigo as the only residual symptom. At the 1-mo follow-up, neuro-otological evaluation revealed a selective lesion of the superior vestibular division of the left labyrinth with normal functioning inferior vestibular division. At vestibular testing, there was no caloric response from the affected left ear, and the head impulse tests for the lateral and anterior semicircular canal were also impaired. Tests of vestibular evoked myogenic potentials (VEMP) showed divergent results. Ocular VEMP in response to left ear stimulation were absent, whereas the cervical VEMP were completely symmetrical and normal. Thus, the lesion profile implies a partial vestibular loss selectively affecting the superior vestibular division of the inner ear. Discussion: The most likely explanation for such a selective injury seems to be bubble microembolism coupled with both the specific anatomy of this terminally supplied subunit, and with the slow nitrogen wash-out of the vestibular organ.

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