Biomedical subjects

Mayumi Kato

Publications and source records attributed to Mayumi Kato.

3 recordsLinked to original sources

PubMed2006

Automatic continuous scanning and random-access switching of mid-infrared waves generated by difference-frequency mixing.

We report the rapid tuning of mid-infrared waves beyond 5 microm emitted in difference-frequency mixing with an electronically tuned dual-wavelength Ti:Al2O3 laser used as a pumping source. Simultaneous rapid tuning of the dual wavelengths, which satisfy phase matching in AgGaS2, allows rapid random access switching and continuous tuning of mid-infrared wavelengths. In random-access switching, the mid-infrared wavelength is tuned every pulse shot at a repetition rate of 1 kHz. Mid-infrared wavelengths continuously tuned from 5.2 to 7.2 microm, from 7.0 to 9.1 microm, and from 8.9 to 12.0 microm are achieved at phase-matched angles of 55 degrees, 50 degrees, and 45 degrees, respectively.

Journal Article↗

PubMed2002

Prospective study of fall risk assessment among institutionalized elderly in Japan.

The purpose of the present study was to identify risk factors for falls among institutionalized elderly, using the standardized risk assessment tool developed by Izumi. We examined 746 patients from three types of facilities: rehabilitation wards in four general hospitals, three long-term care facilities, and three nursing homes, for up to three months. The incidence of falls within all facilities was 12.5%. Patterns of relative risks of falling differed among types of facilities. The highest relative risk of fall in long-term care facilities and nursing homes was nurses' prediction, followed by history of fall and altered mentation. In contrast, that in general hospitals was mobility. In long-term care facilities, history of falls (odds 3.68, 95CI: 1.47-9.23) and interaction (history of falls and assistance with toileting) (odds 3.13, 95CI: 1.48-6.64) showed significance on adjusted-odds ratios for fall. History of falls, altered mentation, and assistance with toileting may be used to screen patients at a high risk for fall at admission.

Accidental Falls↗

PubMed2002

[The changes over time in areas of abnormal choroidal staining in central serous chorioretinopathy].

PURPOSE: We discuss the permeability of the choroid in central serous chorioretinopathy (CSC). METHODS: Forty-eight eyes of 48 patients with active CSC and their fellow eyes were studied with indocyanine green angiography (IA). Abnormal choroidal stainings in the late phase were fed in to a computer and hyperfluorescent areas were summated. The hyperfluorescent area at the initial examination was compared with that at the second examination. The values obtained were compared with the clinical characteristics shown by ophthalmoscopic, fluorescein angiographic (FA), and IA findings. RESULTS: The abnormal choroidal staining during IA was observed in 90% of the affected eyes and 67% of the fellow eyes. The average abnormal staining area was larger in the affected eyes than in the fellow eyes and decreased over time in both affected and fellow eyes, but the decrease rate of the abnormal staining was higher in the affected eyes. In FA abnormal staining areas of the smokestack type were significantly smaller than those of the round-diffusion type. The range of abnormal choroidal staining was significantly smaller in the affected eyes treated with laser photocoagulation than in the eyes not treated without laser coagulation. CONCLUSIONS: We conclude that the range of abnormal choroidal staining is consistent with changes of activity in the course of CSC, that the malfunction of the retinal pigment epithelium and choroidal hyperpermeability mutually influence CSC and that the disappearance of serous detachment in the clinical course plays an important role in the improvement of choroidal permeability and the retinal pigment epithelium function.

Adult↗