Yasuteru Yamanaka

Statistical Analysis of Patients with Vertigo and Dizziness over the Last 14 Years at Our Clinic.

Statistical analysis was carried out on 2637 patients (male 40%, female 60%) with vertigo and dizziness at the Department of Otolaryngology, Nissei Hospital over 14 years from April, 1980 to March, 1994. The average number of cases was 188 per year, accounting for 5.4 percent of the total number of outpatients.The number of patients increased each year especially until 1987. The age distribution showed a peak in the fifties until 1990, the peak shifted to the sixties thereafter. The trend is explained by increases in longevity.The cases were classified into four groups; 1) peripheral disorders (29.4%), 2) central disorders (17.2%), 3) disorders of other origins (36.7%), and 4) disorders of unknown origins (16.7%). The first and third groups increased in number each year.Fifty-six percent of all patients were referrals; 35.8% from the Department of Internal Medicine at our hospital, 7.6% from other Departments, and 12.2% from other medical facilities. The fact that the number of referrals decreased each year indicates that patients with vertigo see otologists or specialists immediately.

Analysis of tympanometry in hearing impaired school children.

Tympanometric and otoscopic evaluations were performed in 56 children with sensorineural hearing loss, aged 4 to 11 years.Type B tympanograms were found in 17.2% of the 4-to 6-year-old group, and 0% of the 7-to 11-year-old group.The children with type B tympanogram were re-examined in Nara Medical University, and otitis media with effusion (OME) was diagnosed in 4 (13.8%) of the 29 younger children (4-to 6-year-old).The incidence of OME in children with sensorineural hearing loss seemed to be almost the same as in healthy children. The incidence of OME was high in younger children.OME seemed to raise the hearing threshold in the younger group.

Adenoid Cystic Carcinoma of the Larynx

82才, 男性の嗄声を主訴として来院した症例に, 高年令と心疾患のため積極的な治療は出来なかったが, 試切により得られた病理組織学的検索および細胞形態的検索より, adenoid cystic carcinoma と診断し, 粘膜下に存在する粘液腺の腺細胞と筋上皮細胞に, その腫瘍の組織発生を求めた.

Head Movements of the Vestibular Origin and the Regulatory Functions of the Central Nervous System

Changes in head movements and the behaviours of various neck muscles which were caused by unilateral vestibular stimuli were studied electro-nystagmoraphycally in rabbits. the results obtained are as follows: I) When the head is deviated on the side of a non-stimulated ear, there immediately develops an increase in the tone of the perivertebral neck muscles of the same side. in head nystagmus the bilateral superficial anterior neck muscles which operated alternately head movements are inhibited on each side play the most important role. 2) the vestibular head movements are inhibited in consequence of a marked increase of tonus in the superficial nape muscles of the stimulated side under the control of the cerebellum.