Biomedical subjects

W W Kim

Publications and source records attributed to W W Kim.

14 recordsLinked to original sources

PubMed2004

Dual endoscopic-assisted endoluminal colostomy reversal: a feasibility study.

BACKGROUND: Emergent colostomies are associated with increased morbidity related to second closure operations. The purpose of this canine pilot study was to create a minimally invasive procedure that would reduce the time interval and morbidity involved with colostomy reversals after left colon end colostomies. METHODS: Six mongrel dogs underwent modified laparoscopic Hartmann's procedures in which the stapled end of the rectal stump was approximated to the left colon proximal to the stoma. After 1 week, they underwent an endoluminal colostomy reversal with a computer-mediated, circular stapling device and varying anvil insertion methods. Variables recorded included anvil insertion technique and feasibility, OR time, complications, and number of days to first meal and bowel movement. A contrast enema performed 1 week post colostomy reversal ruled out anastomosis leaks and stenosis. The dogs were euthanized and subjected to necropsy. RESULTS: Of four anvil insertion techniques tested, the most feasible employed a large-bore needle to perforate through the stapled end of the Hartmann pouch into the lumen of the left colon. Simultaneous endoluminal views of the rectal stump with a sigmoidoscope and the left colon lumen with an endoscope permitted a controlled and safe needle puncture. Through the needle, a guide wire was inserted to withdraw the anvil via the colostomy into place. A transanally inserted stapler was then married to the anvil under fluoroscopic guidance, thus completing the anastomosis. The colostomy was then taken down and transected at the level of the colocolostomy. Average operating time was 126 min (range 90-180), diet was tolerated within 1.5 days, and average number of days to first bowel movement was 2.5. The absence of stenosis, leaks, and inadvertent visceral injuries confirmed feasibility. CONCLUSIONS: In this canine model, a dual endoscopic-assisted colostomy reversal with a computer-mediated, circular stapling device is feasible. Using this technique, colostomy reversals can possibly be performed 1 week post-colostomy without entering the peritoneal cavity, thus reducing the number of invasive operations and subsequent morbidity required to manage emergent colon perforations.

Anastomosis, Surgical↗

PubMed2002

Laparoscopic harvesting of small bowel graft for small bowel transplantation.

BACKGROUND: Small bowel transplantation represents a valid therapeutic option for patients with intestinal failure, obviating the need for long-term total parenteral nutrition. Recently, reports have shown the feasibility of performing living related intestinal transplantation using segmental small bowel grafts. The limitations of this technique include inadequate harvested small bowel lengths, as compared with the lengths obtained in cadaveric small bowel harvests, and large incisions for the donor. In this pilot study, we evaluated the feasibility of laparoscopically harvesting long segments of proximal jejunum for small bowel transplantation using a porcine model. The results can be used to evaluate the potential for applying this technique in human cases. METHODS: For this study 10 yorkshire pigs were used. Under general anesthesia, each pig underwent laparoscopic segmental resection of 200 cm of proximal jejunum on a vascular pedicle. The harvested graft then was autoreimplanted using an open technique by anastomosing the vascular pedicle to the superior mesenteric vessels. Success was determined 2 hours after anastomosis by visually identifying a pink graft with viable-appearing mucosa, an artery with a strong thrill, and palpable venous flow. The animals were then sacrificed. RESULTS: The mean operation time required to laparoscopically harvest the small bowel graft was 80 min (range, 35-120 min), and the mean length of harvested graft was 220 cm (range, 200-260 cm). The mean length of the graft's vascular pedicle was 4.5 cm (range, 4-5 cm). All 10 grafts were successfully harvested laparoscopically and then reimplanted using an open technique. All the grafts maintained good vascular flow, and showed no evidence of mucosal necrosis at necropsy. Obviously, further studies would be required to examine the long-term results of reimplanting a laparoscopically harvested small bowel graft, but proposals for such studies is beyond the scope of this report. CONCLUSION: Minimally invasive techniques can be used to harvest proximal small bowel grafts for living related small bowel transplantation.

Animals↗

PubMed2001

Cumulus cells apoptosis as an indicator to predict the quality of oocytes and the outcome of IVF-ET.

PURPOSE: Our purpose was to establish an evaluation system for oocyte quality based on the incidence of cumulus cells apoptosis and to examine the effect of coculture, using autologous cumulus cells, on the outcome of IVF-ET according to proliferative activities of helper cells and the incidence of cumulus cells apoptosis. METHODS: Cumulus cell masses were collected from 91 mature oocytes among 330 oocytes retrieved from a total of 34 IVF-ET cycles with tubal infertility and unexplained infertility. The incidence of apoptosis in cumulus cells was assessed by apoptosis detection kit fluorescein. On ovum pick up, 2nd day embryos were cocultured with autologous cumulus cells. Prior to coculture, in vitro proliferative activity of cumulus cells was evaluated. RESULTS: Cumulus cells from patient groups over 40 years old had a significantly increased apoptosis incidence, a lower fertilization rate, and the decreased number of oocytes retrieved compared to the other age groups (P < .05). The incidence of cumulus cells apoptosis was significantly lower when the number of oocytes retrieved was 5 or less (P < .05). Cumulus cells from fertilized oocytes (0.43 +/- 0.07%) and those from patients who became pregnant (0.44 +/- 0.11%) following IVF-ET showed a significantly lower incidence of apoptosis compared to those of unfertilized oocytes (1.80 +/- 0.35%; P < .001) and the nonpregnant group (0.81 +/- 0.10%; P < .05). Embryo quality also had a negative correlation with the incidence of cumulus cells apoptosis. Coculture of fertilized oocytes with cumulus cells with high proliferative activity resulted in improved rates of implantation and pregnancy compared to that with poor active cumulus cells. No significant difference was found between the in vitro proliferative activity of cumulus cells and the incidence of cumulus cells apoptosis (P < .063). CONCLUSIONS: The age of women might influence the incidence of apoptosis in cumulus cells, and the increased incidence of apoptosis is associated with the number of oocytes retrieved, the fertilization rate, and the pregnancy outcome following IVF-ET. These results suggest that the incidence of cumulus cells apoptosis can be used in predicting oocyte quality, outcome of IVF-ET, and age-related decline in fertility.

Adult↗

PubMed2000

Laparoscopic procedures during the third trimester of pregnancy.

Pregnancy no longer is considered to be an absolute contraindication for laparoscopic procedures. Furthermore, clinically helpful guidelines are in place for laparoscopic procedures during pregnancy. However, laparoscopic operations in women in the third trimester have not yet been reported fully. We successfully operated on torsion of an ovarian cyst in a woman during her third trimester using laparascopic procedure. The patient experienced an uneventful recovery.

Adult↗

PubMed2000

The development of reactor coolant pump vibration monitoring and a diagnostic system in the nuclear power plant.

Monitoring abnormalities within reactor coolant pumps due to vibration, we introduce a Wigner distribution (WD) to a vibration monitoring system for analyzing vibration signals, and develop an on-line diagnostic method using the neural network employing back propagation algorithm. A rotor kit is used to simulate the abnormal conditions in the pump such as bearing rubbing, shaft bending, misalignment, etc. The data collected from the kit are analyzed using both a conventional system based on the Fourier transform (FT) and the software developed with the WD in this study, and they are compared. The study shows that spectrum represented by WD makes it easy to analyze the vibration signals of a rotating machine and the developed diagnostic method will help the operators grasp the cause of vibrations.

Journal Article↗

PubMed2000

Relationships between concentrations of tumor necrosis factor-alpha and nitric oxide in follicular fluid and oocyte quality.

PURPOSE: Our objective was to explain a relationship between concentrations of tumor necrosis factor-alpha (TNF-alpha) and nitric oxide (NO) in follicular fluid, oocyte quality, and outcomes of in vitro fertilization--embryo transfer (IVF-ET). METHODS: The concentrations of TNF-alpha and NO were measured in 115 follicular fluid samples collected from 43 patients undergoing IVF-ET program, due to tubal obstruction, some with endometriosis (8 patients) or hydrosalpinx (5 patients). A correlation of these factors concentrations and the oocyte quality, the oocyte maturity, and infertility-associated diseases was analyzed. RESULTS: No correlation was found between concentrations of NO and TNF-alpha in follicular fluid. NO concentrations in follicular fluids were significantly higher in patients with endometriosis (P < 0.001) or hydrosalpinx (P < 0.01) compared to the patients with just tubal obstruction. Follicular NO concentration differences according to oocyte maturity and oocyte quality were not found. In contrast, TNF-alpha concentrations in follicular fluids were significantly higher in poor quality oocytes (P < 0.05) but were not associated with infertility-associated diseases, such as hydrosalphinx or endometriosis,and the oocyte maturity. No significant differences in follicular levels of NO and TNF-alpha as well as IVF-ET parameters of pregnant and nonpregnant groups were revealed. CONCLUSIONS: There is no significant correlation between the concentrations of NO and TNF-alpha in follicular fluid. NO levels in follicular fluid are altered in infertility-associated diseases. However, TNF-alpha levels but not NO levels influence oocyte quality. These results suggest that the production of NO and TNF-alpha in follicular fluid may be regulated via different pathways and can be tempered with infertility-associated diseases, thereby influencing oocyte quality locally.

Adult↗

PubMed2000

Toxic amebic colitis coexisting with intestinal tuberculosis.

A patient with a fulminant amebic colitis coexisting with intestinal tuberculosis had a sudden onset of crampy abdominal pain, mucoid diarrhea, anorexia, fever and vomiting with signs of positive peritoneal irritation. Fulminant amebic colitis occurring together with intestinal tuberculosis is an uncommon event and may present an interesting patho-etiological relationship. The diagnosis was proven by histopathologic examination of resected specimen. Subtotal colectomy including segmental resection of ileum, about 80 cm in length, followed by exteriorization of both ends, was performed in an emergency basis. Despite all measures, the patient died on the sixth postoperative day. The exact relationship of fulminant amebic colitis and intestinal tuberculosis is speculative but the possibility of a cause and effect relationship exists. Fulminant amebic colitis may readily be confused with other types of inflammatory bowel disease, such as idiopathic ulcerative colitis, Crohn's disease, perforated diverticulitis and appendicitis with perforation. This report draws attention to the resurgence of tuberculosis and amebiasis in Korea, and the need for the high degree of caution required to detect it.

Diagnosis, Differential↗

PubMed1999

Subclass-specific nuclear localization of a novel CD4 silencer binding factor.

The control of CD4 expression is essential for proper T lymphocyte development. We have previously described a cis-acting silencer element required for repressing transcription of the CD4 gene. Here we report the cloning and characterization of a novel factor that binds to a critical functional site in the CD4 silencer. This factor, referred to as silencer-associated factor (SAF), is a member of the helix-turn-helix factor family and shares sequence similarity with the homeodomain class of transcriptional regulators. Introduction of a specific mutation into the SAF binding site in the CD4 silencer abrogates silencer activity in transgenic mice, supporting the hypothesis that SAF is important in mediating silencer function. Although SAF is expressed in all lymphocytes, immunofluorescence studies indicate that SAF is present primarily in the cytoplasm in T cells in which the endogenous silencer is nonfunctional, whereas it is present primarily in the nucleus in T cells in which the silencer is functional. We thus hypothesize that the subclass-specific subcellular compartmentalization of SAF plays an important role in mediating the specificity of function of the CD4 silencer during T cell development.

Amino Acid Sequence↗

PubMed1993

Systemic lupus erythematosus and Hodgkin's lymphoma.

OBJECTIVE: Systemic lupus erythematosus (SLE) is associated with lymphoproliferative diseases such as Hodgkin's lymphoma. Since there is considerable overlap between the features of SLE and Hodgkin's lymphoma (SLE/HL) there can be a great difficulty in diagnosing Hodgkin's lymphoma in the presence of SLE. Our objective was to determine the features that can suggest coexistent SLE/HL: METHODS: We describe 3 cases of Hodgkin's lymphoma that occurred in the setting of SLE and review the features of 11 reported cases in which the diseases occurred simultaneously. We compare the features of these cases with those of Hodgkin's lymphoma and SLE occurring alone. RESULTS: Mediastinal adenopathy was seen in 58% and retroperitoneal adenopathy in 17% of patients with SLE/HL, while it was seen only rarely in these sites in cases with SLE. Severe generalized pruritus, which occurs in only 2.8% of cases of SLE, was seen in 63% of cases with SLE/HL: Features such as fever, weight loss, peripheral lymphadenopathy, splenomegaly and hepatomegaly are common to both Hodgkin's lymphoma and SLE. Renal disease is seen in half of the cases of SLE. It is rare in Hodgkin's lymphoma where, unlike SLE, it is only of minimal change or membranous type. Arthritis and positive antinuclear antibodies are rare in Hodgkin's lymphoma. CONCLUSIONS: Persistent lymphadenopathy, especially mediastinal and/or retroperitoneal lymphadenopathy, eosinophilia and generalized pruritus in a patient with SLE not responding to treatment may be indicative of coexistent Hodgkin's lymphoma.

Adult↗

PubMed1992

Nonperturbative diffraction tomography via Gauss-Newton iteration applied to the scattering integral equation.

A nonperturbational inverse scattering solution for the scattering integral equation (SIE) is presented. The numerical discretization of the SIE is performed by the moment method (MM) using sinc basis functions. Previous algorithms using the alternating variable (AV) nonlinear iteration with algebraic reconstruction technique (ART) solution of the linearizations are shown to diverge for high contrast/large size acoustic scatterers. This deficiency is alleviated by the use of the Gauss-Newton (GN) nonlinear iteration with conjugate gradient (CG) solution of the linearizations. Further numerical efficiency is attained by use of the biconjugate gradient (BCG) algorithm to solve the forward scattering problems. Test problem reconstructions of circular cylinders, using the Bessel series analytic solution to generate the scattering data, demonstrate the accuracy of the method. Inhomogeneous models of human cross-sections verify the high spatial resolution and high speed of sound contrast capability of the method.

Acoustics↗

PubMed1984

Evaluation of long-term dietary intakes of adults consuming self-selected diets.

Mean daily intakes of calories and 19 nutrients were calculated for 13 males and 16 females, ages 20 to 53 yr, who kept daily diet records for 1 yr. Mean daily caloric and 19 selected nutrient intakes of the subjects met or exceeded the 1980 recommended dietary allowances except for iron and calcium for females. Males had higher intakes than females for all nutrients studied except crude fiber, vitamin A, and vitamin C. However, nutrient density values were comparable for both sexes, except that the females had higher nutrient density values for vitamin A than did the males. The younger subjects had higher intakes of calories and saturated fat than the older ones. The younger males had higher intakes of total fat, saturated fat, and oleic acid than the older males. The consistency of reporting food intakes examined by applying a systematic sampling method designed for this study did not vary considerably when diet records kept over a long period of time were evaluated by four methods.

Adult↗

PubMed1984

Effect of making duplicate food collections on nutrient intakes calculated from diet records.

In a 1-yr study in which food intakes were recorded daily, subjects were asked to make duplicate food collections for 1 wk during each of the four seasons. Mean calculated energy intake of the 29 subjects was 12.9% less during the food collection periods than the mean for the entire year (which included collection periods). There were also significant reductions in the reported intake of all nutrients during the collection periods. Protein, vitamin A, saturated fat, and cholesterol intakes were decreased to the greatest extent. The actual decrease in energy intake was greater for the males than for the females, but the percentage was the same (12.9%). The younger group of subjects (less than or equal to 35) decreased energy intake 16.8% and the older group (greater than 35) 8.8%. Comparison of intakes during collection periods with intakes the week before and the week after showed that 28 of the 29 subjects decreased their energy intake from 1.1 to 32.3%. These data suggest that intakes of subjects during food collection periods do not represent their habitual levels of intake reported throughout the year.

Adult↗

PubMed1984

Relationships among dietary constituents and specific serum clinical components of subjects eating self-selected diets.

Sex- and age-related differences in dietary and blood chemistry factors were investigated in subjects adhering to their usual lifestyles. Diet records were examined daily and blood chemistry profiles were monitored five times during the 1-yr study. As expected, high-density lipoprotein cholesterol was significantly higher in women than in men. Values of creatine phosphokinase, aspartic aminotransferase, alanine aminotransferase, glucose, triglycerides, urea nitrogen, uric acid, and total bilirubin were higher in men than in women. Glucose was lower while high-density lipoprotein cholesterol, albumin, and total protein were higher in the younger women than in older women. Alcohol consumption by men correlated positively with aspartic aminotransferase and alanine aminotransferase but not with high-density lipoprotein cholesterol. Alcohol consumption by women did correlate positively with high-density lipoprotein cholesterol but not with the aminotransferase enzymes. Correlations between serum high-density lipoprotein cholesterol and vitamin C intake were positive and significant in women. In men, high levels of high-density lipoprotein cholesterol seems to be associated with very high vitamin C intakes, but no associations were apparent at normal levels of these parameters. Serum cholesterol did not correlate significantly with dietary cholesterol, saturated fat, linoleic acid, or P/S in men or women.

Adult↗

PubMed1984

Magnesium intakes, balances, and blood levels of adults consuming self-selected diets.

Magnesium balances and plasma and blood cell concentrations were determined in 34 men and women, 20 to 53 yr of age, during each season for 1 yr while they were consuming their customary diets. Dietary records were maintained 365 days. Analysis of variance indicated no seasonal variation in intake or balance. Blood cell magnesium correlated with magnesium intake (r2 = 0.203; p less than 0.04). Daily magnesium intakes of the men (323 mg) were significantly higher (p less than 0.01) than of the women (234 mg), and reflected greater calorie consumption for their greater body weights. Daily magnesium balances for the men and women were -32 and -25 mg, respectively. Multiple regression analysis showed that magnesium balance was associated not only with magnesium intake but also with the intake of other nutrients such as fiber, protein, calcium, and phosphorus. Moreover, the effect of these nutrients on magnesium balance varied with age and sex.

Adult↗