摘要:

The effect of amphetamine sulfate injection on head and eye movements evoked by optokinetic stimulus was studied in squirrel monkeys. No change was found in the gain of optokinetic-oculomotor and optokinetic-caputomotor functions, even after the maximum dose (0.5 mg/kg) of amphetamine. Also, no change in eye-head coordination was found. However, amphetamine facilitated the frequency of head nystagmus, whereas that of eye nystagmus did not change. When the poststimulus responses were studied in the dark, both nystagmoid head movement and optokinetic after eye nystagmus showed first phase and second phase. A different effect was found in the duration of these two phases suggesting the existence of distinct generators. Moreover, the synchronized onsets of head and eye nystagmus in both phases, and synchronized occurrence of quick phases indicated the existence of shared neural circuitry between head and eye movements.

ISSN:0301-1569    

DOI:10.1159/000275659

出版商:S. Karger AG    

年代:1983

数据来源: Karger

摘要:

The purpose of this study is to investigate the diagnostic value of using the damped pendular rotation test (DPRT) (1) with an ocular fixation (ocular fixation test, i.e. OFT), and (2) in the dark with the eyes open, jointly with auditory brain stem response (ABR) audiometry. Impairment of ocular fixation was found in patients with either brain stem lesions, cerebellar lesions, or cerebellopontine angle tumors. A collective evaluation of the findings of OFT with those of ABR audiometry has suggested the possibility of differentiating upper brain stem lesions from lower brain stem lesions, tumors of the IVth ventricle, and cerebellar tumors. However, differentiating IVth ventricle lesions from tumors involving the cerebellar vermis extending into the IVth ventricle by this battery of tests was somewhat limited.

ISSN:0301-1569    

DOI:10.1159/000275660

出版商:S. Karger AG    

年代:1983

数据来源: Karger

摘要:

The oxygen-15 inhalation technique has been applied to the quantification of regional cerebral blood flow and metabolism with positron emission tomography. These findings support the notion that vestibular cortex is not only one small area in the temporal or parietal cortex but a wider area in the temporoparietal cortex. During caloric reactions cortical potential changes were found on the contralateral temporoparietal cortex. The recent development of positron emission tomography (PET) is theoretically capable of changing considerably the research of the pathophysiology in central vestibular disturbances. Validity of the 15O2 inhalation model and the feasibility of the PET technique does have – like any physiological measurement – some limitations, but it obviously has a tremendous clinical potent

ISSN:0301-1569    

DOI:10.1159/000275661

出版商:S. Karger AG    

年代:1983

数据来源: Karger

摘要:

The advantages and disadvantages of the transtympanic and extratympanic methods for recording electrocochleographic potentials (ECochG) are discussed. Our extratympanic method (adapted from Coats) and some results are presented. We conclude that for broad clinical application an ear canal surface electrode is the method of choice for recording ECochG, unless the primary question is one of threshold measurement. If the registration of brainstem potentials from the vertex does not show a potential I, we recommend simultaneous recording of ECochG by an extratympanic method with earphones.

ISSN:0301-1569    

DOI:10.1159/000275662

出版商:S. Karger AG    

年代:1983

数据来源: Karger

摘要:

Operative findings and results of stapedectomy in 32 patients (43 ears) with osteogenesis imperfecta are presented. The stapes footplates were in many ears thick and of a very soft consistency. In all the operated ears we found the stapes footplates fixated in the oval window. Brittle and atrophic stapes crura were a common finding, but in only 5 ears fractures of the crura were observed. A thick and vascular middle ear mucosa was seen in several ears. Although the middle ear proved quite different from that of otosclerosis, no major difficulties and no serious complications occurred during stapedectomy. Both the immediate postoperative hearing gain and the long-term hearing results were, in general, satisfactory. Our study supports the statement of others, that stapedectomy in osteogenesis imperfecta is a safe and reasonable alternative to hearing aids.

ISSN:0301-1569    

DOI:10.1159/000275663

出版商:S. Karger AG    

年代:1983

数据来源: Karger

摘要:

Disadvantages of instruments and methods of the usual microlaryngoscopic examination procedure carried out under general anesthesia are offset in an almost optimal way when Brünings’ counterpressure device is employed and the operation is carried out under local anesthesia. Some notes concerning the method, which are based on 10 years’ experience, are g

ISSN:0301-1569    

DOI:10.1159/000275664

出版商:S. Karger AG    

年代:1983

数据来源: Karger

ISSN:0301-1569    

DOI:10.1159/000275665

出版商:S. Karger AG    

年代:1983

数据来源: Karger

ISSN:0301-1569    

DOI:10.1159/000275666

出版商:S. Karger AG    

年代:1983

数据来源: Karger

ISSN:0301-1569    

DOI:10.1159/000275667

出版商:S. Karger AG    

年代:1983

数据来源: Karger

ISSN:0301-1569    

DOI:10.1159/000275658

出版商:S. Karger AG    

年代:1983

数据来源: Karger