OBJECTIVE: This study was carried out to evaluate the effect of the isolation methods of inner cell mass from mouse blastocyst, types of feeder cells and treatment time of mitomycin C on the formation rate of ICM colony. METHODS: The inner cells were isolated by conventional immunosurgery, partial trophoblast dissection with syringe needles and whole blastocyst co-culture method. Commercially available STO and primary cultured mouse embryonic fibroblast (pMEF) feeder cells were used, and mitomycin C was treated for 1, 2 or 3 hours, respectively. The formation rate of ICM colony was observed after isolation of ICM and culture of ICM on the feeder cells for 7 days. RESULT: The ICM colony formation rate on STO were significantly higher in partial trophoblast dissection group (58%) than that in immunosurgery (12%) or whole blastocyst culture (16%) group (p<0.05). The formation rate on pMEF feeder layer was higher in partial trophoblast dissection (88%) and whole blastocyst culture (82%) group than that in immunosurgery (16%) group (p<0.05). When mitomycin C treated to pMEF for 2 hours, the formation rate of 88% was significantly higher than those of other conditions. CONCLUSIONS: Above results showed that the efficient isolation method of ICM from blastocyst was the partial trophoblast dissection and the appropriate treatment time of mitomycin C was 2 hours. However, the subculture of ICM colony and characterization of stem cells should be carried out to confirm the efficacy of the partial trophoblast dissection method.
Animals ; Blastocyst ; Coculture Techniques ; Feeder Cells* ; Fibroblasts ; Mice* ; Mitomycin* ; Needles ; Stem Cells ; Syringes ; Trophoblasts

No abstract available.
Hepatitis*

PURPOSE: To report a case of bilateral peripheral ulcerative keratitis after cataract extraction with a clear corneal incision in a patient with rheumatoid arthritis. CASE SUMMARY: A 67-year-old woman was referred to our clinic with bilateral ocular pain and visual disturbances, 10 days after a cataract extraction in her right eye. The patient had undergone a cataract extraction with clear corneal incision in the left eye and the same procedure was performed in the right eye after 1 week. During the surgery, hyphema occurred because of the iris damage by the phacoemulsification tip. Slit lamp examination showed bilateral peripheral ulcerative keratitis around the incision site and diffused corneal edema. Topical instillation and systemic administration of antibiotic agents were given as treatment but the patient showed no improvement. Corneal culture and smear were performed and showed a negative result. Because the patient was previously diagnosed with rheumatoid arthritis and showed the characteristic finger deformity, she was diagnosed with a sterile peripheral ulcerative keratitis and was treated with oral steroid, sulfasalazine, and steroid eye drop. After 1 month of treatment, epithelial thinning of the cornea and peripheral corneal ulcer stopped progressing and showed corneal re-epithelization. CONCLUSIONS: Because peripheral ulcerative keratitis after cataract extraction with clear corneal incision can occur in a patient with rheumatoid arthritis, caution is necessary to minimize damage by careful manipulation during the operation and requires special attention in preoperative and postoperative management.
Arthritis, Rheumatoid ; Cataract ; Cataract Extraction ; Congenital Abnormalities ; Cornea ; Corneal Edema ; Corneal Ulcer ; Eye ; Female ; Fingers ; Humans ; Hyphema ; Iris ; Phacoemulsification ; Sulfasalazine ; Ulcer

PURPOSE: This study was carried out to clarify the histological characteristics of the interface of the corneal stroma and Descemet's membrane of the human eye. METHODS: Nighteen donor eyes without corneal pathology were examined by scanning and transmission electron microscopy. The Descemet's membrane including the corneal endothelium was cheked for scanning electron microscopy. The junctional characteristics of the posterior corneal stroma and Descemet's membrane was examined by transmission electron microscopy. RESULTS: The scanning electron microscopy showed that collagen sheet faced each other at the right angle near the Descemet's membrane and penetrated the Descemet's membrane with the irregular arrangement. The transmission electron microscopy showed that the electron-dense collagen filaments extended to the posterior stroma from Descemet's membrane. The arrangement of electron-dense collagen filaments paralleled with the arrangement of the collagen fibrils of the posterior stroma. CONCLUSIONS: The interface of the corneal stroma and Descemet's membrane was composed of two-typed extracellular materials without the intercellular specificatons.
Collagen ; Corneal Stroma* ; Descemet Membrane* ; Endothelium, Corneal ; Humans ; Microscopy, Electron ; Microscopy, Electron, Scanning ; Microscopy, Electron, Transmission ; Pathology ; Tissue Donors

Brain Computerized Tomography(CT) and cerebral angiography were reviewed in thirty-six patients with multiple intracranial aneurysms(22.5%) among the 160 consecutive surgical cases of intracranial aneurysms. The prevalent sites of multiple aneurysms were the middle cerebral artery(37.0%), posterior communicating artery(22.2%), and internal carotid artery(14.8%) in sequence. However, the vertebrobasilar system(83.3%), anterior communicating artery(63.6%), and posterior communicating artery(50.0%) had higher probability of rupture than internal carotid artery(8.3%) or middle cerebral artery(33.3%). Based on CT and angiographic information, the site of rupture can be predicted with a high degree of reliability. These factors were the presence of localized hemorrhage on CT, focal vasospasm, size and irregularity of aneurysms, and relative hyperplasia of parent artery.
Aneurysm ; Arteries ; Brain ; Cerebral Angiography ; Hemorrhage ; Humans ; Hyperplasia ; Intracranial Aneurysm ; Parents ; Rupture

Tuberous sclerosis is reported rarely and is associated with systemic lesions including central nervous system, skin, heart, eye and kidney. Approximately 5-15% of individuals with tuberous sclerosis will develop brain neoplasia, almost invariably subependymal giant-cell astrocytoma (SGCA). We experienced a case of SGCA with tuberous sclerosis operated by the transcallosal approach and report with literature review.
Astrocytoma* ; Brain ; Central Nervous System ; Heart ; Kidney ; Skin ; Tuberous Sclerosis*

BACKGROUND: The emergence of multidrug-resistant Acinetobacter baumannii as a nosocomial pathogen is one of the major public health problems. The aim of this study was to evaluate the role of an efflux pump gene adeJ for the multidrug resistance of A. baumannii clinical isolates. METHODS: Two groups (MDRAB and SAB) of A. baumannii clinical isolates were studied. The SAB group consisted of strains that did not meet the criteria of MDRAB and were susceptible to more categories of antibiotics than MDRAB. Antimicrobial susceptibility results obtained by VITEKII system were used in data analysis and bacterial group allocation. We performed real-time reverse transcription PCR to determine relative expression of adeJ. We compared relative expression of adeJ in comparison groups by considering two viewpoints: i) MDRAB and SAB groups and ii) susceptible and non-susceptible groups for each antibiotic used in this study. RESULTS: The mean value of relative expression of adeJ of MDRAB and SAB groups was 1.4 and 0.92, respectively, and showed significant difference (P=0.002). The mean values of relative expression of adeJ of susceptible and non-susceptible groups to the antibiotics cefepime, ceftazidime, ciprofloxacin, imipenem, meropenem, tigecycline, piperacillin/tazobactam, ticarcillin/clavulanic acid, trimethoprim/sulfamethoxazole, piperacillin, and gentamicin showed statistically significant differences. CONCLUSION The overexpression of adeIJK might contribute to the multi-drug resistance in A. baumannii clinical isolates. Further, the overexpression of adeIJK might be one of the factors contributing to the resistance to numerous antibiotics.

PURPOSE: This study was performed to investigate the cellular characteristics of the secondary pupillary membrane. METHODS: The secondary pupillary membrane was removed from the anterior lens surface during cataract extraction from 2 patients with cataract associated with uveitis. Specimen from one patient was stained with hematoxylin-eosin with flat preparation method. Specimen from the other patient cultured for 1 and 2 weeks was observed with transmission electron microscopy. RESULTS: The flat preparation showed the neovascular membrane with pigment-laden cells. The cultured cells consisted of the well preserved vascular components which had the vascular endothelial cells and pericyte and pigment-laden cells lined by basement membrane on first week of culture. The iris pigment epithelial cell which contained the pigment granules within cytoplasm and lined by basement membrane were observed on second week of culture. CONCLUSIONS: These results suggest that the secondary pupillary membrane consists of vascular membrane and pigment epithelial cell of iris which is a major component of secondary pupillary membrane and secrets extracellular matrix.
Basement Membrane ; Cataract ; Cataract Extraction ; Cells, Cultured ; Cytoplasm ; Endothelial Cells ; Epithelial Cells ; Extracellular Matrix ; Humans ; Iris ; Membranes* ; Microscopy, Electron, Transmission ; Pericytes ; Uveitis

Langerhans cell sarcoma (LCS) is a neoplastic proliferation of Langerhans cells that have overtly malignant cytologic features. It is a very rare disease and theoretically, it can present de novo or progress from an antecedent Langerhans cell histiocytosis (LCH). However, to our knowledge, LCS arising from an antecedent LCH has not been reported on. We present here a case of LCS arising from a pulmonary LCH. A 34 yr-old man who was a smoker, had a fever and a chronic cough. Computed tomographic (CT) scan revealed multiple tiny nodules in both lungs. The thoracoscopic lung biopsy revealed LCH. The patient quit smoking, but he received no other specific treatment. One year later, the follow up chest CT scan showed a 4 cm-sized mass in the left lower lobe of the lung. A lobectomy was then performed. Microscopic examination of the mass revealed an infiltrative proliferation of large cells that had malignant cytologic features. Immunohistochemical stains showed a strong reactivity for S-100 and CD68, and a focal reactivity for CD1a. We think this is the first case of LCS arising from LCH.
Tomography, X-Ray Computed ; Sarcoma/*pathology ; S100 Proteins/biosynthesis ; Radiography, Thoracic ; Pancreatic Neoplasms/*pathology ; Male ; Langerhans Cells/*pathology ; Immunohistochemistry ; Humans ; Histiocytosis, Langerhans-Cell/diagnosis/*pathology ; Gene Expression Regulation, Neoplastic ; Antigens, Differentiation, Myelomonocytic/biosynthesis ; Antigens, CD1/biosynthesis ; Antigens, CD/biosynthesis ; Adult

BACKGROUND: When patients return to the emergency department shortly after being seen, it is generally assumed that their initial evaluation or treatment was inadequate. But in other aspects many short term revisits may be unnecessary in the aspect of emergency care because it is known that substantial numbers of patients use emergency department for nonemergency problems. So we analysed the tendency and the cause of short term revisit patients, determined the rates and the associated demographic, clinical, disease variables as a tool of quality assurance. METHODS: We carried out a chart review of patients seen in the emergency department, who revisited within 72 hours, of Young Dong Severance Hospital retrospectively between January 1, 1998 and September 30, 1999 (period 2), and compared with result between April 1, 1990 and March 31, 1991 (period 1) respectively. RESULTS: In the period 1, the total revisits patients were 204/21,025(0.97%), in that period scheduled revisits were 15.2%, the unscheduled were 84.8%, and the frequent revisits (more than 3 times) were 6.4%. In the period 2, the total revisit patients were 4,722/72,802 (6.49%), in that period scheduled revisits were 86.3%, the unscheduled were 13.7%, and the frequent revisits were 24.8%. The most common cause of revisit during the period 2 is a drug addictor (31.2%) that frequently used the emergency room for seeking drug. CONCLUSIONS : The scheduled revisit patients for dressing, medication, re-evaluation were increased enormously, so the medical care of these patients might be a part of job that performed in emergency department. And if the health care system could support the adequate nursing care facility, the portion of avoidable revisits of emergency department can be decreased. We also found that the emergency department is an important points for the early identification and referral for the treatment of patients who revisited emergency room for seeking drug, and the analysis of physician related factor in revisits patients may be used as a tool of quality assurance in the emergency department.
Bandages ; Delivery of Health Care ; Emergencies* ; Emergency Medical Services ; Emergency Service, Hospital* ; Humans ; Nursing Care ; Referral and Consultation ; Retrospective Studies