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Biomedical subjects

T Kawara

Publications and source records attributed to T Kawara.

At least 109 records · Page 6Linked to original sources
PubMed1985

Effect of contrast on fusional visual evoked potential (VEP): a model and experimental results.

A visual evoked potential (VEP) component that appears in the power spectrum only during binocular fusion has recently been discovered. When both eyes are stimulated with the same checkerboard but at different pattern reversal rates, this fusional component appears at a frequency intermediate between the two stimulus frequencies. We have proposed a model to explain the appearance of this intermediate component and have tested the model's predictions that the fusional component will remain constant independent of binocular or monocular changes in stimulus contrast. As predicted by the model, changes in contrast over the range of 10 to 90% produced no significant change in the power of the fusional component.

Evoked Potentials, Visual↗
PubMed1984

Effects of stimulus contrast on binocular VER.

The effect of stimulus contrast changes on the binocular visual evoked response (VER) was investigated using pattern reversal VER, dichoptic stimulation, and Fast Fourier Transform. When the stimulus contrast was changed binocularly, the monocular components increased as the contrast increased. The binocular component first appeared at the level of 10% contrast; its magnitude was stable under all recording conditions. When the stimulus contrast was changed monocularly, the eye that received the higher contrast stimulation showed more power in the power spectrum. The binocular component appeared even when the difference in contrast between the two eyes was large. The magnitude of the binocular component was stable under all recording conditions. We concluded that the binocular and the monocular components differ in the magnitude of their responses to a contrast change and speculate that the pathways responsible for the two components are not identical.

Adult↗
PubMed1984

[Surgical treatment of infective endocarditis in childhood--report of 3 cases].

This is the case report of 3 surgical patients with infective endocarditis in childhood. Case 1: A 8 year-old boy was admitted with high fever and congestive heart failure. Aureus staphylococci were identified by blood culture. Echocardiogram showed a vegetating mass on the posterior mitral leaflet. This patient was cured by emergency mitral valve replacement during the active phase of infection. Case 2: A 3 year-old girl was admitted with infective endocarditis related to VSD. Viridans streptococci were identified by blood culture. Echocardiogram showed a vegetating mass on the septal tricuspid leaflet. After successful antibiotic therapy, this patient underwent the closure of VSD and tricuspid valvuloplasty. Case 3: A 7 year-old boy was admitted with infective endocarditis related to VSD. Aureus staphylococci were identified with blood culture. Echocardiogram showed a vegetating mass on the anterior tricuspid leaflet and moderate tricuspid regurgitation. After successful antibiotic therapy, this patient underwent the closure of VSD and tricuspid valvuloplasty. We believe that echocardiography plays an important role in the diagnosis and management of infective endocarditis and that tricuspid valvuloplasty is the method of first choice in treatment of the patient with regional tricuspid infective endocarditis.

Child↗
PubMed1980

A new method for retroillumination photography of cataractous lens opacities.

We studied a new method for photographing cataractous lens opacaities by retroillumination. The slit-lamp microscope was modified with an adaptor to eliminate the specular reflection from the corneal surface. We construcated two kinds of adaptors for the Zeiss and Goldmann-type slit-lamp microscopes. The cataractous lens opacities were recorded both on Ektachrome color films and Tri-X monochromatic films. In using a monochromatic film, an orange filter was inserted in the illumination beam in order to increase the image contrast. The results were satisfactory with high resolution and good contrast. We found the new device to be useful clinically for evaluating the progressive changes of cataractous lens opacities.

Cataract↗