[Normative data and clinical practice of sinusoidal harmonic acceleration test].
OBJECTIVE
To establish the normative data of sinusoidal harmonic acceleration test (SHAT) and evaluate the value of clinical application.


METHODS
One hundred and twenty normal persons, 21 Meniere's disease patients, 2 bilateral vestibular peripheral lesion patients, 15 unilateral vestibular peripheral lesion patients and 10 central lesion patients were tested with SHAT.


RESULTS
The calibration time was longer in the older persons. The phase decreased with the frequency, and the gain increased with the frequency, but the reliability of the re-test of the phase was better in the lower frequency. The results of the 7 Meniere's disease patients without symptoms were normal, 14 patients post-attack revealed abnormal, 11 had phase abnormal, 3 had gain decrease, 10 revealed asymmetry and spontaneous nystagmus simultaneously, 8 patients had two parameters abnormal. The unilateral vestibular peripheral lesion patients showed 73% (11/15) phase abnormal, 67% (10/15) gain decrease and 40% (6/15) asymmetry, while 5/6 asymmetry patients had spontaneous nystagmus. The gain of the bilateral vestibular peripheral lesion patients showed severe decrease. The abnormal rate in central lesion patients were 70% (7/10) in phase, 20% (2/10) in gain and 40% (4/10) in asymmetry, but the patients with asymmetry had no spontaneous nystagmus.


CONCLUSIONS
The normal range of the phase, gain and asymmetry of SHAT is in narrow bandwidth. The phase is the most important abnormal sign.
Wang
Wu-qing
WQ
Department of Otorhinolaryngology Head and Neck Surgery, Eye Ear Nose and Thorat Hospital, Fudan University, Shanghai 200031, China. wwuqing@eent.shmu.edu.cn
Chi
Fang-lu
FL
Wu
Li-wen
LW
Lu
Hua-zeng
HZ
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016022:Case-Control Studies; D002648:Child; D005260:Female; D006801:Humans; D007759:Labyrinth Diseases / Q000175:diagnosis / Q000503:physiopathology*; D008297:Male; D008575:Meniere Disease / Q000175:diagnosis / Q000503:physiopathology*; D008875:Middle Aged; D012016:Reference Values; D014724:Vestibular Function Tests / Q000379:methods / Q000706:statistics & numerical data*; D055815:Young Adult