Thirty-six subjects with confirmed, unilateral benign paroxysmal positioning vertigo of at least 2 months' duration were randomly assigned to one of two treatment groups. After complete informational counseling and explanation of the posttreatment instructions, subjects were randomly assigned to receive either Epley's canalith repositioning procedure or a placebo maneuver. All subjects completed a daily diary for 1 month to document any dizzy spells and their adherence to the posttreatment instructions. Follow-up Dix-Hallpike testing was performed after 1 month by an audiologist who was blinded to the patient's treatment group status. Analysis of Dix-Hallpike results confirmed that those who received the canalith repositioning procedure had significantly more negative responses (88.9%) than did those in the placebo group (26.7%).
The presentation of any sensory stimulus of sufficient intensity produces a widespread evoked potential from the human brain. This can be recorded from scalp electrodes. These responses can also be elicited by any fairly abrupt change or alteration of the sensory environment. An evoked response occurs when the frequency of an auditory stimulus, the color of a visual stimulus, or the rate of tactile stimulation is changed perceptibly from an established condition. The response wave form is insensitive to direction of frequency change, but it has greater amplitude with intensity in crement than with a decrement. The evoked response amplitude and latency are related to the magnitude of the stimulus change. Evoked responses are also elicited when a tone being presented to one ear is changed to the other ear. Any perceptible alteration of one’s sensory environment from an established condition appears capable of eliciting not only behavioral alerting but also an accompanying evoked cortical response.
The implantati on of a cochlear electronic prosthetic device is an accept able means of improving the communication ability of pre- and postlinguaIIy deafened children and adults. A significant number of patients in this series are in the senior citizen age group. It has been beneficial in improving communication ability in selected profoundly deafened individuals. There has been a significant improvement in the cochlear electronic prosthetic device since the initial report of Djourno1 in 1957.
All private and public residential and day schools for the deaf in the U.S. that have 100 or more students were surveyed to see how many prelingually deafened students they had with cochlear implants and how many of these students were still using the device. Responses came from 70% (45 of 64) of those schools surveyed. Of the 151 implanted children identified, 71 (47%) were no longer using the cochlear implant. Of the remaining 80 children (53%) still wearing the device, we could not specifically determine by survey the percentage who derived significant benefit from the device and the percentage who did not. However, numerous comments by those returning the questionnaires indicated despondency over the results of the implant.
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