Ultrasonic therapy in ear, nose and throat surgery.
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Ear Diseases↗
Biomedical subjects
A W Morrison
Publications and source records attributed to A W Morrison.
Genetic factors in otosclerosis.
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Adolescent↗
The effect of surgically induced recurrent laryngeal nerve palsies on the larynx of the dog and subsequent modification by superior laryngeal nerve section.
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Animals↗
Transtympanic electrocochleography during glycerol dehydration.
Thirteen patients with Meniere's disorder were tested using transtympanic electrocochleography during glycerol dehydration. The most common finding was a decrease in the negative summating potential and this appeared to be a more sensitive indicator of changes occurring in the cochlea than pure tone audiometry and speech discrimination. A pathophysiological explanation for this observation is offered and the possibility of using this decrease in the negative summating potential as a pointer to the prognosis of endolymphatic sac surgery is discussed.
Action Potentials↗
Otoadmittance changes following glycerol dehydration in Meniere's disease.
Otoadmittance studies were undertaken in 76 patients with Meniere's disease and 8 control subjects undergoing glycerol dehydration. Baseline otoadmittance values were significantly higher in ears with fluctuant hydrops compared to the non-fluctuant ears (p less than 0.01), suggesting that there is a pathophysiological difference between these clinical Meniere's groups. Significant maximum conductance changes were seen in 53.4% of hydroptic ears, and were associated with subjective audiometric threshold shifts in 23.2%. Similar changes were not seen in the control ears. These findings provide further clinical evidence to support an underlying physical basis for the auditory symptoms of endolymphatic hydrops and the effects of glycerol dehydration on the inner ear. Objective otoadmittance changes appear to be a more sensitive indicator of reversible hydrops than conventional audiometry. Possible mechanisms to explain the somewhat paradoxical increase in the resistance to the flow of sound energy through the cochlea following reduction of the endolymphatic hydrops by glycerol dehydration are discussed.
Adolescent↗
Meniere's disease saccus surgery technique.
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Drainage↗
Acetazolamide in Meniere's disease: evaluation of a new diagnostic test for reversible endolymphatic hydrops.
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Acetazolamide↗