The purpose of this study was to evaluate the neuroprotective effect of memantine, a N-methyl-D-aspartate antagonist, in an experimental optic nerve ischemia. Endothelin-1 (ET-1) in a dosage of 0.1 microg/day was delivered to the perineural region of the anterior optic nerve by osmotically driven minipumps for 8 weeks in 10 rabbits. In 5 rabbits, 1 mg/kg memantine was administered concurrently by intramuscular injection once a daily. Morphologic optic nerve head changes were monitored with a confocal scanning laser ophthalmoscope. Multivariate statistical analysis showed a significant change in topometric parameters (cup area, cup depth and rim volume), indicating an increase in optic nerve head cupping and a decrease of neural rim volume in the ET-1 administered eyes (P < 0.0001). In rabbits where memantine was given concurrently with ET-1, no significant change in topometric parameters was observed after ET-1 administration (P = 0.78). The current results suggest that memantine has a neuroprotective effect in optic nerve ischemia. Memantine may potentially be useful in the management of various ischemic disorders of the optic nerve, including glaucoma.
Animal ; Comparative Study ; Endothelin-1/toxicity ; Excitatory Amino Acid Antagonists/*therapeutic use ; Male ; Memantine/*therapeutic use ; Models, Animal ; Neuroprotective Agents/*therapeutic use ; Optic Disk/*drug effects/pathology ; Optic Nerve/*drug effects/pathology ; Optic Neuropathy, Ischemic/chemically induced/pathology/*prevention & control ; Rabbits

OBJECTIVES: This study examined job satisfaction, empowerment, job stress, and burnout among tuberculosis management nurses and physicians in public healthcare institutions. METHODS: This was a cross-sectional study analyzing survey data collected from 249 nurses and 57 physicians in 105 public health centers, three public tuberculosis hospitals, and one tertiary hospital. The survey questionnaire comprised general characteristics, work-related characteristics, and four index scales (job satisfaction, empowerment, job stress, and burnout). The two-sample t-test was used to estimate the mean differences in the four index scales. Multiple regression analysis was used to determine whether general and work-related characteristics affected the four index scales. RESULTS: The job satisfaction and empowerment scores of the nurses were lower than those of the physicians. Except for the tuberculosis-specialized hospitals alone, the average job satisfaction scores of nurses were higher than those of physicians. Moreover, the nurses reported more job stress and burnout than did the physicians in tuberculosis departments in public healthcare institutions in Korea; in particular, the burnout reported by nurses was significantly higher than that reported by physicians at the National Medical Center. Marital status, nursing position, number of coworkers, the average number of days of overtime work per month, self-rated health, and hospital type were associated with the four index scales. CONCLUSIONS: Overall, nurses were more vulnerable to job stress and burnout than physicians. Reducing the workload of nurses by ensuring the presence of sufficient nursing staff and equipment, as well as by equipping facilities to prevent tuberculosis infections, should be considered priorities.
Cross-Sectional Studies ; Delivery of Health Care ; Hospitals, Chronic Disease ; Humans ; Job Satisfaction* ; Korea ; Marital Status ; Nursing ; Nursing Staff ; Power (Psychology) ; Public Health ; Tertiary Care Centers ; Tuberculosis* ; Weights and Measures

PURPOSE: To evaluate the effects of various factors on the variability of retinal nerve fiber layer (RNFL) thickness measurements using the Stratus optical coherence tomography (OCT) in normal and glaucomatous eyes. METHODS: Four hundred seventy-four subjects (103 normal eyes and 371 glaucomatous eyes) were scanned to determine the RNFL thickness measurements using the Stratus OCT. Measurements were obtained twice during the same day. The standard deviation (SD) was used to compare the variability in RNFL thickness measurements of the normal subjects to that of the glaucomatous patients. Multivariate regression analysis was used to evaluate which covariates were independent predictors of SD in overall mean RNFL thickness. RESULTS: The mean SD of all RNFL thickness measurements was larger in the glaucoma group except in one sector. In the multivariate regression analysis, the average signal strength (SS) and the relative SS change (difference in SS between initial and repeat scans, divided by initial SS) were independent predictors of the SD in the RNFL thickness measurements (partial R2 = 0.018, 0.013; p = 0.016, 0.040, respectively). CONCLUSIONS: Glaucomatous eyes tend to be more variable than normal eyes in RNFL thickness measurement using the Straus OCT. The average SS and the relative SS changes appear to correlate with the variability in RNFL thickness measurement. Therefore, the results of the RNFL analysis should not be interpreted independently of these factors.
Aged ; Female ; Glaucoma/*pathology ; Humans ; Male ; Middle Aged ; Multivariate Analysis ; Nerve Fibers/*pathology ; Predictive Value of Tests ; Reference Values ; Regression Analysis ; Reproducibility of Results ; Retina/*cytology/*pathology ; Tomography, Optical Coherence/*methods/*standards

PURPOSE: To evaluate the effect of axial length on the variability of retinal nerve fiber layer (RNFL) thickness measurements using the Stratus optical coherence tomography (OCT) in normal and glaucomatous eyes. METHODS: We measured the RNFL thickness in 474 subjects using the Stratus OCT twice during the same day. Axial length was measured with the IOLMaster, and refractive error was the absolute value of the spherical equivalent measured with an auto ref-keratometer. Standard deviation in overall mean RNFL thickness was used as the dependent variable to identify significant correlations. RESULTS: Long axial length affected the variability in the RNFL thickness value by stratus OCT at the temporal quadrant (p = 0.006) and clock-hour sector 9 (p = 0.001). Refractive error also affected the variability of the RNFL thickness value by stratus OCT at the temporal quadrant (p = 0.025) and clock-hour sector 9 (p = 0.024). CONCLUSIONS: It is clinically significant that longer axial length demonstrates greater variability in temporal area as detected by OCT, a measurement which correlates with the preferably damaged position in the myopic glaucoma eye.
Adult ; Aged ; Female ; Glaucoma/*pathology ; Humans ; Male ; Middle Aged ; Myopia, Degenerative/*pathology ; Nerve Fibers/*pathology ; Prospective Studies ; Refractive Errors ; Retinal Ganglion Cells/*pathology ; Tomography, Optical Coherence/*methods

Surgical management of acral lentiginous melanoma on the toe poses a difficult challenge because of the lack of surrounding tissue. A full-thickness skin graft after excision may provide a good cosmetic outcome, but graft failure can occur due to limited blood flow of the toe and the thin skin covering over the deep fascia in the pressure bearing area may cause gait disturbance. A negative-pressure device can be beneficial for fixing the graft and stimulating the growth of granulation tissue. A 55-year-old woman diagnosed with malignant melanoma on the right third toe underwent wide excision, after which secondary intention healing was initiated using negative-pressure therapy. When the wound had regenerated enough granulation tissue after 2 weeks, a full-thickness skin graft was performed, which was secured with negative-pressure therapy. The graft was successfully taken after a week thereafter. Accordingly, the use of negative-pressure therapy in the surgical management of acral lentiginous melanoma may be a good option because it facilitates full-thickness skin graft survival in an avascular surface area and aids in the thickening of the pressure bearing area, where acral lentiginous melanoma is likely to occur.
Cosmetics ; Fascia ; Female ; Gait ; Graft Survival ; Granulation Tissue ; Humans ; Intention ; Melanoma ; Skin ; Toes ; Transplants ; Ursidae