[Endoscopic skull base surgery under the guidance of image navigation technology].

Objective: To investigate the feasibility of image navigation technology in endoscopic skull base surgery.

Methods: This study consisted of 75 patients who underwent the endoscopic operations with the help of the image navigation system by the same surgeon between March 2010 and March 2013. The time to prepair image navigation system, identifying anatomical structure, complications, tumor resection, and follow-up results were analysed.

[Hearing impairment in patients with mild cognitive impairment and Alzheimer's disease].

Objective: To study the relationship between the degrees of peripheral auditory dysfunction and clinical dementia rating (CDR) in the patients with mild cognitive impairment (MCI) and Alzheimer's disease (AD).

Methods: Pure-tone thresholds (PT), word recognition scores (WRS), acoustic immittance and auditory brain-stem responses (ABR) were done to evaluate the auditory function in 24 cases of the patients with MCI and in 31 cases of the patients with AD and in 50 subjects of the control group. Clinical dementia rating (CDR) questionnaire was used to define the dementia degree of the subjects.

[Hearing impairment in senile dementia of Alzheimer's type].

Objective: To evaluate the pure tone hearing threshold and word recognition score of senile dementia of the Alzheimer's disease (AD) patients, and to analyze the relationship between hearing loss and the cognition impairment.

Methods: Pure tone audiometry, word recognition score (WRS), acoustic immittance and auditory brainstem response (ABR) are used to evaluate the auditory function of 43 patients with AD and 50 subjects of the control group. The confounding factors are controlled.