Young Oh Kweon

Kyungpook National University Hospital, Sŏul, Seoul, South Korea

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Publications (78)176.94 Total impact

  • European journal of gastroenterology & hepatology. 12/2014; 26(12):1440-3.
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    ABSTRACT: New definitions and criteria were released at the Baveno V consensus meeting. The purposes of this study were to verify Baveno V definitions and criteria for failure to control bleeding and to determine the usefulness of combined use of the Adjusted Blood Requirement Index [ABRI: (number of blood units)/(final hematocrit-initial hematocrit)+0.01] with Baveno V criteria. Two hundred and forty-six consecutive liver cirrhosis patients with acute bleeding associated with portal hypertension were enrolled prospectively between January 2010 and October 2012. The treatment outcome on day 5 was assessed by endoscopy. For the ABRI calculation, two hematocrit levels were used as the initial hematocrit: the first level measured upon patient arrival (ABRI-A) and the lowest level measured before transfusion (ABRI-B). Treatment failures were identified in 53 patients, of whom 24 died. Based on repeated endoscopic findings, 29 patients were identified as treatment failures, while according to Baveno V criteria, 47 patients were regarded as treatment failures. The area under the receiver operating characteristic curve (AUROC) of Baveno V criteria was 0.906, and the sensitivity, specificity, positive predictive value, negative predictive value, positive likelihood ratio, and negative likelihood ratio were 83.0%, 98.4%, 93.6%, 95.5%, 53.41, and 0.17, respectively. The AUROC of Baveno V criteria was significantly greater than those of Baveno IV (p= 0.0001) and Baveno II/III (p<0.0001) criteria. Adding ABRI-A or -B to Baveno V criteria resulted in a significant reduction of the AUROC (p<0.01). Conclusions: The Baveno V criteria are good predictors of treatment failure of early-stage acute gastrointestinal bleeding in patients with portal hypertension, while the addition of ARBI does not improve the prediction accuracy of the outcome of bleeding. (Hepatology 2014)
    Hepatology 09/2014; · 12.00 Impact Factor
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    ABSTRACT: The aim of this study was to investigate the clinical characteristics of acute hepatitis A during a recent outbreak in Korea. Data of patients diagnosed with acute hepatitis A from 2007 to 2009 were collected from 21 tertiary hospitals retrospectively. Their demographic, clinical, and serological characteristics and their clinical outcomes were analyzed. A total of 4,218 patients (mean age 33.3 yr) were included. The median duration of admission was 9 days. The mean of the highest ALT level was 2,963 IU/L, total bilirubin was 7.3 mg/dL, prothrombin time INR was 1.3. HBsAg was positive in 3.7%, and anti-HCV positive in 0.7%. Renal insufficiency occurred in 2.7%, hepatic failure in 0.9%, relapsing hepatitis in 0.7%, and cholestatic hepatitis in 1.9% of the patients. Nineteen patients (0.45%) died or were transplanted. Complications of renal failure or prolonged cholestasis were more frequent in patients older than 30 yr. In conclusion, most patients with acute hepatitis A recover uneventfully, however, complication rates are higher in patients older than 30 yr than younger patients. Preventive strategies including universal vaccination in infants and active immunization of hepatitis A to adult population should be considered for prevention of community-wide outbreaks of hepatitis A in Korea.
    Journal of Korean medical science 02/2014; 29(2):248-53. · 0.84 Impact Factor
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    ABSTRACT: Background/AimsSorafenib is recommended as a standard treatment for advanced hepatocellular carcinoma (HCC). We investigated the efficacy and safety of sorafenib as a first-line therapy in Korean patients with advanced HCC. Methods From 2007 to 2012, 86 patients with advanced HCC (Barcelona Clinic Liver Cancer stage C) treated with sorafenib as a first-line therapy were enrolled from five tertiary hospitals. Predictors of overall survival (OS) and progression-free survival (PFS) were analyzed. ResultsThe median age was 59.5 years and 71 (82.6%) were males; 57 (66.3%) patients were in Child-Pugh class A. The median OS and PFS were 5.0 (range, 4.0-5.9) and 3.2 (range, 2.6-3.7) months, respectively. Regarding OS, Child-Pugh class A (6.0 vs. 2.8 months), tumor diameter < 5 cm (6.0 vs. 4.3 months), baseline α-fetoprotein (AFP) < 200 ng/mL (5.8 vs. 4.1 months), and the advent of hand-foot-skin reaction (HFSR) of ≥ grade 2 (5.9 vs. 4.0 months) were independent favorable predictors (all P < 0.05). Similarly, regarding PFS, Child-Pugh class A (4.3 vs. 2.1 months), tumor diameter < 5 cm (3.9 vs. 2.8 months), baseline AFP < 200 ng/mL (5.6 vs. 2.8 months) and the advent of HFSR of ≥ grade 2 (4.5 vs. 2.6 months) were independent favorable predictors (all P < 0.05). All toxicities during sorafenib treatment were manageable. Conclusions Because the efficacy of sorafenib seems marginal in Korean patients with treatment-naïve HCC, how to select candidates with favorable outcomes should be further investigated.
    Journal of Gastroenterology and Hepatology 02/2014; · 3.33 Impact Factor
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    ABSTRACT: Hepatocellular adenoma (HCA) is one of the important complications of glycogen storage disease type Ia (GSD-Ia) because it can be transformed into hepatocellular carcinoma. Although surgical resection is a standard treatment of choice for solitary HCA, multiple HCAs in GSD-Ia patients present as therapeutic challenges for curative treatment. Therefore, treatment strategy according to malignant potential is important in management of HCAs in GSD-Ia. The authors present a case of histologically proven multiple HCAs without β-catenin mutations occurred in a GSD-Ia patient treated successfully with percutaneous radiofrequency ablation as a minimally invasive therapy.
    World Journal of Gastroenterology 11/2013; 19(42):7480-7486. · 2.55 Impact Factor
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    ABSTRACT: Lamivudine resistance develops in up to 80% of patients with chronic hepatitis B (CHB) after 5 years of treatment. Cross-resistance between nucleos(t)ide analogues limits management options in these patients. To investigate the role of peginterferon alfa-2a as rescue therapy in these patients, the efficacy and safety of peginterferon alfa-2a between treatment-naïve patients and lamivudine-resistant patients with hepatitis B e antigen (HBeAg)-positive CHB were compared. A total of 150 HBeAg-positive CHB patients were stratified according to prior treatment. Lamivudine-resistant patients (n=64) and treatment-naïve patients (n=86) received peginterferon alfa-2a once-weekly for 48 weeks and were followed-up for an additional 24 weeks. Primary endpoints were HBeAg loss and hepatitis B virus (HBV) DNA less than 100,000 copies/mL at end of follow-up. A total of 65 (76%) treatment-naïve patients and 49 (77%) lamivudine-resistant patients completed treatment and 24 weeks of follow-up. Rates of HBeAg loss were comparable at end of follow-up between treatment-naïve patients and lamivudine-resistant patients (20.9% and 23.4%, respectively; p=0.8423). Similarly, rates of HBV DNA less than 100,000 copies/mL were comparable at end of follow-up between treatment-naïve patients and lamivudine-resistant patients (20.9% and 21.9%, respectively; p=1.000). There was no statistically significant difference in alanine aminotransferase normalization rates between treatment-naïve patients and lamivudine-resistant patients (36.0% and 29.7%, respectively; p=0.4848). One patient in each group achieved hepatitis B surface antigen (HBsAg) loss and seroconversion. The most common adverse events were those known to occur with peginterferon alfa-2a therapy and safety profiles were similar between both patient populations. Peginterferon alfa-2a may be effective as a rescue therapy in patients with lamivudine-resistant HBeAg-positive CHB.
    Antiviral therapy 07/2013; · 3.07 Impact Factor
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    ABSTRACT: Chronic hepatitis C patients with advanced fibrosis have unsatisfactory sustained virological response (SVR) rates. Few data demonstrating the efficacy of combination therapy in chronic hepatitis C patients with advanced fibrosis in South Korea are available. The purpose of this study was to assess whether the stage of fibrosis impacts the efficacy of combination therapy for chronic hepatitis C. We retrospectively reviewed data for a total of 109 patients with chronic hepatitis C, treated with peginterferon alfa and ribavirin. SVR according to the stage of liver fibrosis assessed by pretreatment liver biopsy and genotype results were analyzed. Data from 66 genotype 1 patients (60.6%) and 43 genotype 2 or 3 patients (39.4%) among the 109 patients were analyzed. SVR rates for the genotype 1 patients were significantly lower for the stage 3-4 group (32.1%) than the stage 0-2 group (78.9%; P<0.001). SVR rates (92.0% for stage 0-2, 77.8% for stage 3-4, P=0.184) of genotype 2 or 3 patients were not significantly different according to fibrosis stage. Likewise, the frequency of adverse events was not significantly different according to fibrosis stage. Compared to patients without advanced fibrosis, we can anticipate good SVR rates for genotype 2 or 3 patients with advanced fibrosis and they did not show an inferior tolerability for peginterferon and ribavirin combination therpy. Our results suggest that active treatment is needed for genotype 2 or 3 patients with advanced fibrosis.
    Clinical and molecular hepatology. 06/2013; 19(2):148-55.
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    ABSTRACT: Occurrence of hypophosphatemic osteomalacia (HO) induced by administration of low-dose adefovir therapy is rare, and bone scintigraphy of the disease has rarely been reported. We report on bone scintigraphic findings in patients with HO. Multiple uptakes in ribs, spines, and lower extremities, suggesting multiple fractures, were observed on bone scintigraphy. Patients were diagnosed as HO associated with adefovir therapy. Owing to the same predilection sites, multiple uptakes on the axial skeleton can cause confusion with malignant metastatic disease; however, involvement of lower extremity skeletons can provide a scintigraphic clue for use in differentiation of HO from malignant osseous metastasis.
    Clinical nuclear medicine 03/2013; · 3.92 Impact Factor
  • Digestive Diseases and Sciences 01/2013; · 2.26 Impact Factor
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    ABSTRACT: This study evaluated the clinical outcomes of balloon-occluded retrograde transvenous obliteration (BRTO) for the treatment of hemorrhage from gastric varices (GV) in Korean patients with liver cirrhosis (LC). We retrospectively analyzed data from 183 LC patients who underwent BRTO for GV bleeding in 6 university-based hospitals between January 2001 and December 2010. Of the 183 enrolled patients, 49 patients had Child-Pugh (CP) class A LC, 105 had CP class B, and 30 had CP class C at the time of BRTO. BRTO was successfully performed in 177 patients (96.7%). Procedure-related complications (e.g., pulmonary thromboembolism and renal infarction) occurred in eight patients (4.4%). Among 151 patients who underwent follow-up examinations of GV, 79 patients (52.3%) achieved eradication of GV, and 110 patients (72.8%) exhibited marked shrinkage of the treated GV to grade 0 or I. Meanwhile, new-appearance or aggravation of esophageal varices (EV) occurred in 54 out of 136 patients who underwent follow-up endoscopy (41.2%). During the 36.0±29.2 months (mean±SD) of follow-up, 39 patients rebled (hemorrhage from GV in 7, EV in 18, nonvariceal origin in 4, and unknown in 10 patients). The estimated 3-year rebleeding-free rate was 74.8%, and multivariate analysis showed that CP class C was associated with rebleeding (odds ratio, 2.404; 95% confidence-interval, 1.013-5.704; P=0.047). BRTO can be performed safely and effectively for the treatment of GV bleeding. However, aggravation of EV or bleeding from EV is not uncommon after BRTO; thus, periodic endoscopy to follow-up of EV with or without prophylactic treatment might be necessary in LC patients undergoing BRTO.
    Clinical and molecular hepatology. 12/2012; 18(4):368-74.
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    ABSTRACT: To determine whether bispectral index (BIS) monitoring is useful for propofol administration for deep sedation during endoscopic retrograde cholangiopancreatography (ERCP). Fifty-nine consecutive patients with a variety of reasons for ERCP who underwent the procedure at least twice between 1 July 2010 and 30 November 2010. This was a randomized cross-over study, in which each patient underwent ERCP twice, once with BIS monitoring and once with control monitoring. Whether BIS monitoring was done during the first or second ERCP procedure was random. Patients were intermittently administered a mixed regimen including midazolam, pethidine, and propofol by trained nurses. The nurse used a routine practice to monitor sedation using the Modified Observer's Assessment of Alertness/Sedation (MOAA/S) scale or the BIS monitoring. The total amount of midazolam and propofol used and serious side effects were compared between the BIS and control groups. The mean total propofol dose administered was 53.1 ± 32.2 mg in the BIS group and 54.9 ± 30.8 mg in the control group (P = 0.673). The individual propofol dose received per minute during the ERCP procedure was 2.90 ± 1.83 mg/min in the BIS group and 3.44 ± 2.04 mg in the control group (P = 0.103). The median value of the MOAA/S score during the maintenance phase of sedation was comparable for the two groups. The mean BIS values throughout the procedure (from insertion to removal of the endoscope) were 76.5 ± 8.7 for all 59 patients in using the BIS monitor. No significant differences in the frequency of < 80% oxygen saturation, hypotension (< 80 mmHg), or bradycardia (< 50 beats/min) were observed between the two study groups. Four cases of poor cooperation occurred, in which the procedure should be stopped to add the propofol dose. After adding the propofol, the procedure could be conducted successfully (one case in the BIS group, three cases in the control group). The endoscopist rated patient sedation as excellent for all patients in both groups. All patients in both groups rated their level of satisfaction as high (no discomfort). During the post-procedural follow-up in the recovery area, no cases of clinically significant hypoxic episodes were recorded in either group. No other postoperative side effects related to sedation were observed in either group. BIS monitoring trend to slighlty reduce the mean propofol dose. Nurse-administered propofol sedation under the supervision of a gastroenterologist may be considered an alternative under anesthesiologist.
    World Journal of Gastroenterology 11/2012; 18(43):6284-9. · 2.55 Impact Factor
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    ABSTRACT: We evaluated changes in liver function parameters and risk factors for the deterioration of liver function 12 months after percutaneous radiofrequency ablation (RFA) therapy in patients with hepatocellular carcinoma (HCC). The subjects in this retrospective study comprised 102 patients with HCC who had undergone RFA therapy and exhibited no recurrence of HCC 12 months thereafter. Serial changes in serum total bilirubin and albumin, prothrombin time, and Child-Pugh score were evaluated before RFA and 3, 6, 9, and 12 months thereafter. Deterioration of liver function was defined when the Child-Pugh score increased by at least 2 at 12 months after RFA therapy. We determined the factors related to aggravation of liver function after RFA therapy. Liver function had deteriorated 12 months after RFA in 29 patients (28.4%). Serum albumin levels decreased significantly from before (3.7±0.1 g/dL, mean±SD) to 12 months after RFA therapy (3.3±0.1 g/dL, P=0.002). The Child-Pugh score increased significantly during the same time period (from 6.1±0.2 to 7.2±0.3, P<0.001). Pre-RFA thrombocytopenia (≤100,000/mm(3)) was revealed as a significant risk factor for the deterioration of liver function after RFA. However, no patients had episodes of bleeding as a complication of RFA. Among the liver-function parameters, serum albumin level was markedly decreased in HCC patients over the course of 24 months after RFA therapy. A pre-RFA thrombocytopenia represents a major risk factor for the deterioration of liver function.
    Clinical and molecular hepatology. 09/2012; 18(3):302-8.
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    ABSTRACT: In addition to hematopoietic effect, the erythropoietin is known as a multifunctional cytokine with anti-fibrosis and organ-protective activities. The purpose of this study was to evaluate the effect of recombinant human erythropoietin (rhEPO) on hepatic fibrosis and hepatic stellate cells (HSCs). Carbon tetrachloride (CCl(4)) induced hepatic fibrosis mice models were used for in vivo study and HSCs line for in vitro study. CCl(4) and rhEPO (0, 200 or 1000 U/kg) was injected intraperitoneally in BALB/c mice three times a week for 4 weeks. Immunohistochemistry and immunoblotting were performed to evaluate expressions of transforming growth factor-β1 (TGF-β1), α-smooth muscle actin (α-SMA), and fibronectin in explanted liver. Immunoblotting of α-SMA, phophorylated Smad-2 and Smad-2/3 was performed in HSCs treated with TGF-β1 and/or rhEPO. Expressions of TGF-β1, α-SMA, and fibronectin were increased in CCl(4) injected mice livers, but significantly attenuated by co-treatment with CCl(4) and rhEPO. Co-treatment of rhEPO markedly suppressed fibrosis in Masson's trichrome compared with treatment of only CCl(4). TGF-β1 increased phosphorylated α-SMA, Smad-2 expressions in HSCs, which were decreased by rhEPO co-treatment. Treatment of rhEPO effectively suppressed fibrosis in CCl(4)-induced liver fibrosis mice models. Anti-fibrosis effect of rhEPO could be related to inhibition of TGF-β1 induced activation of HSCs.
    Chinese medical journal 09/2012; 125(17):3098-103. · 0.90 Impact Factor
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    ABSTRACT: To address a growing concern about drug-induced liver injury (DILI), a nationwide study was performed to investigate the significance of DILI in Korea. From May 2005 to May 2007, cases of DILI (alanine transferase >3 × upper normal limit or total bilirubin >2 × upper normal limit) from 17 referral university hospitals were prospectively enrolled. Adjudication by the seven review boards was considered for the confirmation of causality and the Roussel Uclaf Causality Assessment Method (RUCAM) scale was used. A total of 371 cases were diagnosed with DILI. The extrapolated incidence of hospitalization at university hospital in Korea was 12/100,000 persons/year. The causes included "herbal medications" (102, 27.5%), "prescription or non-prescription medications" (101, 27.3%), "health foods or dietary supplements" (51, 13.7%), "medicinal herbs or plants" (35, 9.4%), "folk remedies" (32, 8.6%), "combined" (30, 8.2%), "herbal preparations" (12, 3.2%), and others (8, 2.2%). Nine cases were linked to acetaminophen. The frequencies of hepatocellular, mixed, and cholestatic types were 76.3, 14.8, and 8.9%, respectively. A total of 234 cases met the criteria for Hy's law. Five patients died or underwent transplantation. Twenty-five cases (21 herbs and 4 medications) did not meet the time-to-onset criteria of the RUCAM. DILI appears to be a highly relevant health problem in Korea. "Herbal medications" are the principal cause of DILI. A more objective and reproducible causality assessment tool is strongly desired as the RUCAM scale frequently undercounts the cases caused by herbs owing to a lack of previous information and incompatible time criteria.
    The American Journal of Gastroenterology 06/2012; 107(9):1380-7. · 9.21 Impact Factor
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    ABSTRACT: ERCP is the most common procedure for the diagnosis and treatment of bile duct and pancreatic disease, but Post-ERCP pancreatitis makes poor outcome in some cases. The protease inhibitors, nafamostat and gabexate, have been used to prevent pancreatitis related to ERCP, but there is some debate. We tried to evaluate the efficacy of gabexate and nafamostat for the prevention of post-ERCP pancreatitis. Two hundred forty two patients (73 patients in the gabexate group, 88 patients in the nafamostat group and 81 patients in the placebo group) were included in the study after selective exclusion. The incidence of pancreatitis after ERCP was compared among groups. The incidence of pancreatitis were 6.8% in the gabexate group, 5.7% in the nafamostat group and 6.2% in the placebo group (p=0.954). There was no meaningful difference among the gabexate, nafamostat and placebo group.
    The Korean journal of gastroenterology = Taehan Sohwagi Hakhoe chi 03/2012; 59(3):232-8.
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    ABSTRACT: Hepatocellular carcinoma (HCC) is one of the most common malignant neoplasms occuring worldwide. Although surgical resection still remains the treatment of choice for HCC, radiofrequency ablation (RFA) has emerged as reliable alternatives to resection. It is less invasive and can be repeated after short intervals for sequential ablation in case of multiple lesions. The most common complication of RFA is liver abscess, and bile duct injury such as bile duct stricture has been reported. This is a case report of a rare complication of abscesso-colonic fistula after RFA for HCC. The case was treated by percutaneous abscess drainage and antibiotics and occlusion of abscesso-colonic fistula with n-butyl-2-cyanoacrylate embolization.
    The Korean journal of gastroenterology = Taehan Sohwagi Hakhoe chi 11/2011; 58(5):270-4.
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    ABSTRACT: Obesity tends to be associated with increased mortality and morbidity in acute pancreatitis. However, in Asian populations, higher morbidity and mortality have been reported in patients with low body mass indexes (BMIs). This study was undertaken to evaluate the relation between obesity and outcome, and to investigate the occurrence of complications by overweightedness in acute pancreatitis. The medical records of 403 patients with acute pancreatitis were reviewed retrospectively, and Ranson's scores, modified Glasgow scores, Acute Physiology and Chronic Health Evaluation (APACHE) II scores and computed tomography severity indexes were calculated. Patients were categorized by BMI for the analysis. When compared with normal patients (BMI 18.5 to 22.9), all categories with a BMI ≥23 had an increased risk of developing a severe form of acute pancreatitis (p=0.003) and all categories with a BMI ≥25 significantly predicted severity (p<0.001). Patients with class 1 obesity (BMI 25 to 29.9) developed significantly more systemic and metabolic complications. Overweightedness and obesity were found to be associated with a higher risk of developing severe pancreatitis. Further studies are needed to establish the precise prognostic value of obesity in members of the population with low BMIs.
    Gut and liver 09/2011; 5(3):335-9. · 1.31 Impact Factor
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    ABSTRACT: Pegylated interferon (peginterferon) and ribavirin combination therapy is less effective and associated with a higher frequency of serious complications in chronic hepatitis C patients with cirrhosis than in noncirrhotic patients. This study evaluated the efficacy and tolerability of peginterferon and ribavirin treatment in patients with hepatitis C virus (HCV)-related cirrhosis. Eighty-six patients with clinically diagnosed liver cirrhosis were treated with either peginterferon alpha-2a (n=51) or peginterferon alpha-2b (n=35) plus ribavirin. The sustained virologic response (SVR) and adverse effects were analyzed retrospectively. Of the 86 patients (55 males), 48 patients (55.8%) had HCV genotype 1 infection and 38 (44.2%) had genotype non-1 infection. The overall SVR rate was 34.9% (30/86), and the rates of SVR in the genotype 1 and non-1 patients were 20.8% (10/48) and 52.6% (20/38), respectively. The multivariate analysis revealed that having HCV genotype 1 (P=0.003) and high baseline viral load (<8.0×10(5) IU/mL, P=0.012) were the independent predictive factors for SVR failure. In 20.9% (18/86) of the patients, treatment was not completed due to adverse events (27.8%), loss to follow-up (50.0%), and other reasons (22.2%). Peginterferon and ribavirin combination therapy was relatively effective and feasible for clinically diagnosed HCV patients, especially in those with genotype non-1 infection and low baseline viral load.
    The Korean journal of hepatology. 09/2011; 17(3):220-5.
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    ABSTRACT: Radiofrequency ablation (RFA) is performed as an alternative to surgical resection for primary or secondary liver malignancies. Although RFA can be performed safely in most patients, early and late complications related to mechanical or thermal damage occur in 8-9.5% cases. Hemocholecyst, which refers to hemorrhage of the gallbladder, has been reported with primary gallbladder disease or as a secondary event associated with hemobilia. Hemobilia, defined as hemorrhage in the biliary tract and most commonly associated with accidental or iatrogenic trauma, is a rare complication of RFA. Here we report a case of hemocholecyst associated with hemobilia after RFA for hepatocellular carcinoma that was successfully managed by laparoscopic cholecystectomy.
    The Korean Journal of Hepatology 06/2011; 17(2):148-51.
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    ABSTRACT: We report herein a case of 35-years-old woman in whom portal hypertension (esophageal varix and splenomegaly) developed after 12 cycles of oxaliplatin based adjuvant chemotherapy for rectal cancer. She was transferred for the evaluation of etiology of new-onset portal hypertension. The esophageal varix and splenomegaly were absent before the oxaliplatin based adjuvant chemotherapy. Thorough history taking and serological exam revealed no evidence of chronic liver disease. Liver biopsy was done and there was no cirrhotic nodule formation. Instead, perivenular fibrosis was noted. Considering new development of esophageal varices and splenomegaly after 12 cycles of oxaliplatin-based adjuvant chemotherapy, we could conclude that portal hypertension in this patient were due to sinusoidal injury by oxaliplatin. Finally, we recommend regular follow-up with endoscopy and radiologic examination for checking the development of varices and for screening of varices and splenomegaly in patients with colo-rectal cancer who receive oxaliplatin-based chemotherapy.
    The Korean journal of gastroenterology = Taehan Sohwagi Hakhoe chi 04/2011; 57(4):253-7.

Publication Stats

456 Citations
176.94 Total Impact Points

Institutions

  • 2002–2014
    • Kyungpook National University Hospital
      • Department of Gastroenterology and Hepatology
      Sŏul, Seoul, South Korea
    • Daegu Fatima Hospital
      Yeoncheon Gun, South Korea
  • 2003–2009
    • Kyungpook National University
      • Department of Internal Medicine
      Daikyū, Daegu, South Korea