Investigation of cochlear hair cells and the perception of ultrasound signals in guinea pigs.

We established a specific ultrasound frequency-dependent model of cochlear injury using bone conduction ultrasounds in the inner ear of guinea pigs at 50 kHz and 83 kHz, to explore the effects of bone conduction ultrasound in the cochlea. To establish a unilateral cochlear damage model, the unilateral cochlea was destroyed. The control group consisted of 50 kHz and 83 kHz bone conduction ultrasounds in unaltered guinea pigs.

[The value of treadmill exercise test for patients with moderate obstructive sleep apnea-hypopnea syndrome].

Objective: To determine the value of treadmill exercise test in predicting patients with moderate OSAHS treated by uvulopalatopharyngoplasty (UPPP) and tone base reduction or oral appliance.

Method: Sixty-six patients were treated by UPPP and tone base reduction or oral appliance. The data including PSG (AHI, SaO2) and treadmill exercise test (METs) was analysed.