Sujiang Xie | PubMed Health

PubMed2006

[Significance of some otologic function tests in diagnosis of Meniere's disease].

OBJECTIVE: To investigate the significance of vestibular function battery and electrocochleogram on diagnosis of Meniere's disease. METHOD: Patients with Meniere's disease were given pure tone hearing threshold test, auditory brainstem responses (ABR), electrocochleogram (ECoG), vestibular bithermal caloric test and vestibular evoked myogenic potentials (VEMP) test. RESULT: (1) As for the bithermal caloric test, the percentage of the abnormal canal paresis (CP) at three durations, i.e. , 0 to approximately 5 years, 6 to approximately 10 years and over 11 years were 56.9%, 75.9% and 61.6% respectively. The total positive rate was 50.0%. CP and duration of Meniere's disease had low correlation (P < 0.05). (2) The percentage of the abnormal VEMP at three durations, i.e., 0-5 years,6-10 years and over 11 years were 57.4%, 60% and 57.1% respectively. The total positive rate was 58.0%. The duration of Meniere 's disease with normal and abnormal VEMP had no significant difference( P >0.05). (3) The percentage of the abnormal ECoG at three durations, i.e., 0-5 years, 6-10 years and over 11 years were 72.1%, 73.3% and 81.3% (49/68,22/30 and 13/16) respectively. The total positive rate was 76.9%. The duration of Meniere's disease with normal and abnormal ECoG had no significant difference (P >0.05). CONCLUSION: Diagnosis of Meniere's disease is mainly based on the medical history. If it could combine with ECoG, bithermal caloric test and VEMP, the diagnosis would be earlier and more accurate.

Adolescent↗

PubMed2002

Perception of the cabin attitude changes in hypergravity.

BACKGROUND: The G-excess illusion is becoming increasingly recognized as a cause of aviation fatalities. Studies of this illusion have looked at perception of subjects' orientation by moving the head during hypergravity, but independent of the pilot's head movement with respect to aircraft. This illusion can also occur by aircraft motion, but this has not been studied extensively. OBJECTIVE: The aim of this study was to investigate the subject's perception of orientation to the simulator cab attitude changes at 1.6 G without making any head movement with respect to the cab, and assess the feasibility of simulating the G-excess illusion on the ground with a centrifuge-like spatial disorientation simulator. METHODS: The 1.6-G force field was provided by the gravitoinertial force (GIF) of the simulator when it made an off-center (planetary) rotation at a constant velocity of 130 degrees x s(-1). Eleven subjects' perceptions of orientation of the cab attitudes were collected respectively by their report before and after certain cab tilt, in a roll plane of 1.6 G. RESULTS: When the cab was tilted 20 degrees at 1.6 G, the subjects perceived the angle to be 48.6 +/- 39.4 degrees. CONCLUSION: Most subjects experienced an exaggerated sensation to the cab attitude changes in roll plane. G-excess illusion can be generated in a centrifuge-like device on the ground.

Adult↗