Biomedical subjects

Ho Soon Choi

Publications and source records attributed to Ho Soon Choi.

28 records · Page 2Linked to original sources

PubMed2003

[Clinical features of obscure-overt gastrointestinal bleeding].

BACKGROUND/AIMS: Obscure gastrointestinal bleeding (OGIB) is defined as recurrent acute or chronic bleeding for which no sources have been identified by routine endoscopic and contrast studies. The patients with OGIB are frequently difficult to manage and often undergo extensive investigation and even laparatomy without diagnosis. The aim of this study was to review our overall experiences of the investigation and treatment of OGIB. METHODS: We reviewed, retrospectively, medical records of 41 cases with OGIB from June 1996 to July 2002. RESULTS: Of the 41 patients with OGIB, there were 21 men and 20 women and their mean age was 47.8 years (range, 18 to 81 years). Diagnosis was possible in 13 patients (31.7%) and no specific causes were identified in the remaining 28 patients (68.3%). The principal etiologies were gastrointestinal stromal tumor of the small bowel in 3 cases, duodenal diverticulum in 2 cases. Other causes are as follows: adenocarcinoma of the duodenal 3rd portion, duodenal varix at the 4th portion, splenic artery pseudoaneurysm, Crohn's disease, jejunal ulcer, ileal ulcer, ileal angiodysplasia, and anastomosis site bleeding after hemicolectomy. CONCLUSIONS: We conclude that further and logical diagnostic investigations such as small bowel enteroscopy and wireless capsule endoscopy will promise better results.

Adult↗

PubMed2003

[Effects of peroxisome proliferator-activated receptor-gamma agonist on Fas-mediated apoptosis in HT-29 cells].

BACKGROUND/AIMS: Peroxisome proliferator-activated receptor-gamma (PPAR-gamma) plays a critical role in adipocytes differentiation and insulin sensitivity and is also related to regulation of inflammation and cell proliferation. The aim of this study was to investigate the PPAR-gamma agonist-induced apoptosis and effects of PPAR-gamma agonist on Fas-mediated apoptosis in a human colon cancer cell line. METHODS: Cell survival and apoptosis of HT-29 cells were measured by trypan blue exclusion method and FACScan after treatment with 15d-PGJ2, ciglitazone and IgM anti-Fas antibody (CH11), respectively or simultaneously. Also, activation of caspase-3 and caspase-8 was analyzed to assess the effects of PPAR-gamma and Fas on apoptosis signaling pathways. RESULTS: CH11 induced apoptosis of HT-29 cells. 15d-PGJ2 or ciglitazone alone did not induce apoptosis, but combined stimulation with CH11 synergistically induced apoptosis. Also, 15d-PGJ2 alone did not activate caspase-3, but CH11 and 15d-PGJ2 synergistically activated caspase-3. CH11 activated procaspase-8, but 15d-PGJ2 did not. CONCLUSIONS: PPAR-gamma was not an enough condition to induce apoptosis of HT-29 cells. Apoptosis was induced by high dose Fas, and was enhanced with PPAR-gamma agonist. PPAR-gamma agonist seems to enhance Fas-mediated apoptosis by affecting the way between caspase-8 and caspase-3. Further research is needed to use PPAR-gamma agonists as chemopreventive and therapeutic agent for colon cancer and to find the pathways of PPAR-gamma on apoptotic cascade of colon cancer cells.

Apoptosis↗

PubMed2003

[A case of gastric carcinoid tumor with multiple liver metastasis].

Carcinoid tumors originate from the enterochromaffin cells in the gastrointestinal mucosa. Gastric carcinoids are rare and usually well-differentiated tumors with variable prognosis. Three types of gastric carcinoids have been recognized. Type I is associated with type A chronic atrophic gastritis, achlorhydria and pernicious anemia. Type II is associated with Zollinger-Ellison syndrome and multiple endocrine neoplasia type I. Type III appears as a large malignant neoplasm and has no association with atrophic gastritis or hypergastrinemia. We experienced a rare case of gastric carcinoid tumor type III with multiple liver metastasis. Thus, we report here this case with a review of the literature.

Adult↗

PubMed2003

A case of linitis plastica involving the entire colon, ileum, and appendix.

Linitis plastica of the colon is an uncommon presentation of primary colorectal cancer. This entity of colorectal cancer is characterized by a diffuse infiltrating tumor with desmoplastic reaction and poor prognosis. Although widespread infiltration is the main feature of linitis plastica, the tumor extending to more than 2 segments of the colon is uncommon. We report a case of primary linitis plastica involving the entire colon, ileum and appendix. The clinical characteristics are discussed with a review of literatures.

Adult↗

PubMed2003

[Colonic transit time in patient with liver cirrhosis].

BACKGROUND/AIMS: The colonic transit time in patients with liver cirrhosis has not been studied extensively in South Korea. Thus, the authors investigated the differences of colonic transit time between cirrhotic patients and normal controls with attention to factors that affect this change. METHODS: Fifteen cirrhotic patients and 15 controls were included in this study. To exclude any organic diseases, colonoscopy was preceded. The colonic transit time was measured by taking plain abdominal films on the 4th and 7th days after ingestion of radiographic non-absorbable colon markers for 3 days. RESULTS: The colonic transit time was 10.7 +/- 2.6 hours and 24.0 +/- 4.1 hours for cirrhotic patients and controls, respectively, indicating that the transit time in cirrhotic patients is much faster (p<0.05). The transit time for each segment of the colon was also measured. For the ascending colon, average transit time of the cirrhotic patients and controls were 5.60 +/- 1.93 and 6.88 +/- 1.77 hours respectively. For the descending colon, those were 2.80 +/- 1.04 and 10.80 +/- 2.59 hours (p<0.05), while those in the rectosigmoid portion were 2.32 +/- 0.81 and 4.96 +/- 1.19 hours, respectively. These results indicated that a significant difference is present in the descending colon. Additionally, the transit time is correlated with age and albumin level (B=0.760, p<0.05 and B=7.498, p<0.01, respectively). CONCLUSIONS: The colonic transit time of cirrhotic patients is faster than that of control, especially in the descending colon.

Colon↗

PubMed2003

[The significance of urine sodium measurement after furosemide administration in diuretics-unresponsive patients with liver cirrhosis].

BACKGROUND/AIMS: The diagnosis of refractory ascites means a poor prognosis for patients with liver cirrhosis. The definition of refractory ascites has already been established, but using the dosage of diuretics that correlates with the definition of refractory ascites in an out-patient department will lower the compliance of the patient, as well as causing serious complications, such as hepatic encephalopathy and hyponatremia, as the dosage of diuretics is increased. Due to this fact, it is very difficult to apply this definition of refractory ascites to patients in a domestic out-patient department. In this study, in situations where there are difficulties in applying the diuretics dosage according to definition of refractory ascites, we tried to find out whether measuring the value of urine sodium after the administration of intravenous furosemide can be the standard in early differentiation of the response to diuretics treatment. METHODS: We reviewed 16 cases of liver cirrhosis with ascites and classified them into two groups by the response to diuretics. The diuretics-responsive ascites group was 8 cases and the diuretics-unresponsive ascites group consisted of 8 cases. After admission, we examined the patients' CBC, biochemical liver function test, spot urine sodium, and 24 hour creatinine clearance. After the beginning of the experiment, all diuretic therapy was stopped for 3 days. Daily we examined the patients' CBC, biochemical liver function test, and in the 3rd experiment day, we measured 24-hour urine volume and sodium. In the 4th experiment day, after sampling for ADH, plasma renin activity and plasma aldosterone level, we administrated the furosemide 80 mg I.V, and measured the amount of 8 hour urine volume and sodium. RESULTS: The plasma aldosterone level was significantly higher in the diuretics- unresponsive ascites group than in the diuretics-responsive ascites group. In the 4th experiment day, the amount of urine volume and sodium was very significantly lower in the diuretics-unresponsive ascites group than in the diuretics-responsive ascites group (1297.5 +/-80.9 vs 2003.7 +/-114.6 ml, p<0.005, 77.3 +/-8.2 vs 211.8 +/-12.6 mEq, p<0.001). CONCLUSIONS: In out-patient departments, the measurement of urine sodium 8 hours after administrating 80 mg of intravenous furosemide, will help in differentiating ascites patients with lower treatment response to diuretics.

Adult↗

PubMed2002

[Five-year follow-up of clinical and laboratory data of early liver cirrhosis patients confirmed by liver biopsy].

BACKGROUND/AIMS: It is important to evaluate the general status of the liver including the structural and inflammatory aspects, as well as the functional aspects, in order to determine a patient's treatment modality and prognosis. METHODS: 55 Child-Pugh class A liver cirrhosis patients confirmed by liver biopsy have been categorized into 4 groups based on the shunt index and p-value(Y= 3.3431-0.8160 ALT/AST ratio-0.0343 X prothrombin time+2.6963 X shunt index, p = e(y)/(e(y)+1)), which was obtained by Thallium- 201 scan; group I - shunt index less than 0.3 and p-value less than 0.7; group II - shunt index less than 0.3 and p-value more than 0.7; group III - shunt index more than 0.3 and p-value less than 0.7; and group IV - shunt index more than 0.3 and p-value more than 0.7. Statistical analyses used were ANOVA, paired t-test, and Chi-square test. RESULTS: 1. The laboratory data after a 5-year follow-up also showed a significant difference between four groups. 2. In group IV, the Child-Pugh class after 5 years worsened, and complications of liver cirrhosis such as esophageal varix, ascites, and hepatic encephalopathy occurred more frequently. 3. In group II, the laboratory data after a 5-year follow-up indicated some improvement. CONCLUSION: It can be seen that even early in patients with initially the same cirrhosis, the course of the illness can progress to a variety of different situations. The measurement of shunt index and the p-value of cirrhosis will be more helpful in the follow-up evaluation and predicting its prognostic index in liver cirrhosis patients.

Adult↗

PubMed2002

[Relationship of propranolol pharmacokinetic parameters with portosystemic shunt in CCl4-induced cirrhotic rats].

BACKGROUND/AIMS: This study was designed to determine the relationship of propranolol pharmacokinetic parameters with portosystemic shunt in CCl4-induced cirrhotic rats. METHODS: Cirrhotic rats(n=6) were induced by intramuscular injection of CCl4 in olive oil(two time per weeks) for 12 weeks. Controls (n=6) were injected intramuscularly with the same dose of olive oil for 12 weeks. We evaluated the amount of portosystemic shunt by thallium-201 per rectal scintigraphy. After intravenous bolus injection of propranolol (2mg/kg) to rats, the serum propranolol concentrations were analyzed by a HPLC-fluorimetric detector system. Pharmacokinetic parameters such as C0, AUC, t1/2(beta), and CLp were determined in each group. Then, a small amount of heptic tissue was obtained and subjected to determination of the hepatic collagen content by quantitating 4-hydroxyproline and were inspected by microscope after hematoxylin and eosin stain. RESULTS: In liver biopsy, liver fibrosis progressed in CCl4-induced cirrhotic rats. The serum concentrations of propranolol were significantly (p < 0.01) elevated in CCl4-induced cirrhotic rats. Mean amount of 4-hydroxyproline, mean H/L ratio, and mean AUC in CCl4-induced cirrhotic rats was significantly (p < 0.01) higher than that in control rats. There was a relationship between AUC, H/L ratio, and amount of 4-hydroxyproline. CONCLUSION: H/L ratio may help in the selection of drug dosage (especially blood flow dependent drug) in pre-clinical studies for chronic liver disease during the drug development process.

Animals↗

PubMed2002

[Interactions of unconjugated bilirubin with bile acid by rapid solvent partition].

BACKGROUND/AIMS: Our previous studies of ionization and solubility of unconjugated bilirubin (UCB) yielded inappropriately large differences between the two carboxylic pK'a values of UCB. These data, however, were not ideal due to crystal effects, matastability, impurities of the bilirubin, and imprecision of analyses at low UCB. METHODS: The sodium salt of taurocholate (TC) was purified and dissolved in water to 100 mM. Chloroform (CHCl3) was purified by vacuum distillation. Buffers used were: citrate from pH 4 to 6, phosphate from pH 6 to 8, and borate above pH 8. All had an ionic strength of 0.10. The problems were minimized by rapid solvent partition of UCB from CHCl3 into buffered aqueous NaCl, and a new, accurate assay of low UCB in the aqueous phase which was achieved by concentrating the UCB through back extraction into small volumes of CHCl3. RESULTS: In contrast with the crystal dissolution studies, the two pK'a value were similar. H2B0, not HB-, was the dominant UCB species in the pH range of bile (6.0 to 8.0). The aqueous solubilities of UCB were 90 to 98% less. Less than 0.01% of the bile salt partitioned into the CHCl3 phase and self-association of B= was negligible. UCB solubilities in 50 mM TC were 2 to 10% of those obtained by crystal dissolution, and, up to pH 7.9, were below the maximum UCB concentration in normal human bile. CONCLUSIONS: We suggest that the markedly increased binding of UCB with each ionization step is due to the disruption of the internal hydrogen bonds of the ionized carboxyl groups on interaction with the bile salt. We propose to extend the study of partition to determine the activity and the degradation products of calcium salts of unbound bilirubin fractions.

Bilirubin↗

PubMedDate not supplied

Prevalence of gallstone disease in patients with end-stage renal disease treated with hemodialysis in Korea.

BACKGROUND/AIMS: Gallstone disease is one of the major causes of morbidity in adults. Hemodialysis has been found to increase the risk of gallstone formation secondary to increased biliary cholesterol and biliary saturation index. However, there is very little data on the prevalence of gallstones in hemodialysis patients. METHODOLOGY: We compared the prevalence of gallstone disease in patients with end-stage renal disease treated with hemodialysis with that of 208 age- and sex-matched controls (non-uremic group). Patients who had chronic liver disease, renal disease, and diabetes were excluded from the control group. RESULTS: In our study, we found a prevalence for gallstone of 18.2% in patients with end-stage renal disease treated with hemodialysis, which was significantly higher than 5.3% in the non-uremic control. Most of our hemodialysis patients had asymptomatic cholecystolithiasis. Hemodialysis patients with cholecystolithiasis were significantly older than patients without gallstones. We did not find a difference in sex and duration of hemodialysis treatment between patients with and without gallstones. CONCLUSIONS: Our results suggest that the prevalence of gallstone disease is higher in patients with end-stage renal disease treated with hemodialysis than in the non-uremic population in Korea.

Adult↗