[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.