Instructor factors associated with medical students’ lecture evaluation: a longitudinal analysis / 한국의학교육

Purpose@#This study identified factors that affect lecture evaluation by analyzing sophomores from Dankook University, examining each cluster’s characteristics, and comparing differences among trajectories. @*Methods@#This study identified factors that affect lecture evaluation by analyzing sophomores from Dankook University, examining each cluster’s characteristics, and comparing differences among trajectories. @*Results@#The lecture evaluation score decreased as the teaching hours per instructor in a year increased by an hour, and the number of instructors per lecture increased by one individual. During trajectory analysis, the first trajectory had lower lecture evaluation scores overall but relatively high appropriateness of the textbook and punctuality of class, whereas the second trajectory had higher lecture evaluation scores overall for all four items. @*Conclusion@#The two trajectories showed differences in teaching methods (understanding of lecture content and usefulness of the lecture) rather than in external factors (appropriateness of the textbook and punctuality of class). Therefore, to improve lecture satisfaction, enhancing instructors’ instructional competencies through lectures and adjusting the teaching hours by assigning an adequate number of instructors per lecture are recommended.

Current Practice Patterns of Endoscopic Ultrasound-Guided Tissue Sampling for Pancreatic Solid Mass in Korea: Outcomes of a National Survey

Background/Aims@#Although endoscopic ultrasound (EUS)-guided fine needle aspiration (FNA) and fine needle biopsy (FNB) are widely used for tissue acquisition of pancreatic solid mass, the optimal strategy of this procedure has not been established yet. The aim of this nationwide study was to investigate the current practice patterns of EUS-FNA/FNB for pancreatic solid mass in Korea. @*Methods@#The Policy-Quality Management of the Korean Pancreatobiliary Association (KPBA) developed a questionnaire containing 22 questions. An electronic survey consisting of the questionnaire was distributed by e-mail to members registered to the KPBA. @*Results@#A total of 101 respondents completed the survey. Eighty respondents (79.2%) performed preoperative EUS-FNA/FNB for operable pancreatic solid mass. Acquire needles (60.4%) were used the most, followed by ProCore needles (47.5%). In terms of need size, most respondents (>80%) preferred 22-gauge needles regardless of the location of the mass. Negative suction with a 10-mL syringe (71.3%) as sampling technique was followed by stylet slow-pull (41.6%). More than three needle passes for EUS-FNA/FNB was performed by most respondents (>80%). The frequency of requiring repeated procedure was significantly higher in respondents with a low individual volume (<5 per month, p=0.001). Prophylactic antibiotics were routinely used in 39 respondents (38.6%); rapid on-site pathologic evaluation was used in 6.1%. @*Conclusions@#According to this survey, practices of EUS-FNA/FNB for pancreatic solid mass varied substantially, some of which differed considerably from the recommendations present in existing guidelines. These results suggest that the development of evidence-based quality guidelines fitting Korean clinical practice is needed to establish the optimal strategy for this procedure.

Successful removal of remnant cystic duct stump stone using single-operator cholangioscopy-guided electrohydraulic lithotripsy: two case reports

Cholecystectomy is the best method for treating gallstone diseases. However, 10%–30% of patients who undergo a cholecystectomy continue to complain of upper abdominal pain, dyspepsia, or jaundice—this is referred to as postcholecystectomy syndrome. Cystic duct stump stones are a troublesome cause of postcholecystectomy syndrome. Conventionally, surgery is mainly performed to remove cystic duct stump stones. However, repeated surgery can cause complications, such as postoperative bleeding, biliary injury, and wound infection. As an alternative method of surgery, endoscopic retrograde cholangiopancreatography is sometimes used to remove cystic duct stump stones, although the success rate is not high due to technical difficulties. Recently, peroral cholangioscopy, which can directly observe the bile duct, has been suggested as an alternative method. We report two cases in which a cystic duct stump stone was successfully removed via a single-operator cholangioscopy, after failure with an endoscopic retrograde cholangiopancreatography.

Intrahepatic Cholangiocarcinoma: Evolving Concepts and Medical Treatment / 대한췌담도학회지

Cholangiocarcinoma (bile duct cancer) is classified into intrahepatic and extrahepatic cholangiocarcinoma (perihilar and distal cholangiocarcinoma) according to the anatomical location of the lesion. The incidence of extrahepatic cholangiocarcinoma has been relatively stagnant in recent decades, but intrahepatic cholangiocarcinoma is steadily increasing worldwide, requiring attention. Various classification systems based on gross growth patterns, histological findings, and tumor-derived cells, as well as classification based on existing anatomical location, have been proposed, however, the consensus has not been established yet. Intrahepatic cholangiocarcinoma is a carcinoma with an extremely poor prognosis. Complete tumor resection is the only curative treatment. The overall survival rate for 5 years after surgery is 15% to 40%, but recurrence after surgery is observed in 2/3 patients. Therefore, determining the right stage before surgery and selecting an appropriate treatment method through a multidisciplinary approach is a very important process in determining proper treatment. Systemic therapy may be used for locally advanced biliary tract cancer or metastatic biliary tract cancer where surgery is not possible. However, the effectiveness of traditional anticancer chemotherapeutic agents is rather pessimistic, therefore treatments using molecular biological properties have recently been attempted. Finding a way to increase the number of resectable cases through early diagnosis is one of the main challenges. In addition, it is also hoped that the selection of new therapeutic targets and therapeutics will be possible as a result of advanced research on gene expression profiles and mutations in cholangiocarcinoma.

Hypertriglyceridemia-induced Severe Necrotizing Pancreatitis Following Low Dose Tamoxifen Administration / 대한췌담도학회지

A 51-year-old woman visited the emergency room with severe abdominal pain of acute onset. She had undergone a breast cancer operation one year previously and had been taking a half-dose (10 mg per day) of tamoxifen for 6 months. She was diagnosed with severe acute necrotizing pancreatitis. She had no other specific underlying disease or medical history. She did not drink alcohol and showed no gallstones on endoscopic ultrasound examination. Her blood triglyceride level had been normal before tamoxifen but had gradually increased to 2,534 mg/dL 6 months after beginning tamoxifen. Tamoxifen was regarded as a very likely causative factor for her necrotizing pancreatitis. After discontinuing the drug and receiving supportive care, she eventually recovered, and her blood triglyceride levels dropped to a normal range. Tamoxifen may be a useful drug for treating breast cancer, but doctors should pay attention to the patient's blood triglyceride level during the medication regimen.

Practice of Endoscopic Retrograde Cholangiopancreatography in Korea: Results from a National Survey / 대한췌담도학회지

BACKGROUND/AIMS: The aim of this study is to describe the outcome of the national survey and to determine the endoscopic retrograde cholangiopancreatography (ERCP) quality in Korea by comparing with the quality indicators. METHODS: We used the database of Health Insurance Review & Assessment Service and then performed anonymous national survey. RESULTS: Completed questionnaires were returned by 129 of 157 ERCP endoscopists. In Korea, annual ERCP rates have been consistently increased over years. Individual ERCP volume was high (>200 per year) in about half of ERCP endoscopists. Most ERCP endoscopists performed all of level I procedures. However, manometry, cholangiopancreatoscopy, and pancreatic procedures were performed mostly in institutions with high hospital volume. The rate of overall success was more than 90% in most ERCP endoscopists. However, the rate of precut sphincterotomy was high in more than a fourth of ERCP endoscopists. Twelve ERCP endoscopists experienced post-ERCP mortality within recent 1 year. ERCP training and radiation protection during ERCP did not meet the standard of quality indicators especially in institutions with low or moderate hospital volume. CONCLUSIONS: Technical issues during ERCP procedures in Korea fulfill the standard of quality indicators. However, a great effort is needed to improve issues about ERCP training and radiation protection.

An Update on Hypertriglyceridemia-Induced Acute Pancreatitis / 대한내과학회지

Hypertriglyceridemia a major cause of acute pancreatitis, accounting for up to 10% of all cases. The pathophysiological mechanism of hypertriglyceridemia-induced acute pancreatitis (HTGP) is presumed to involve the hydrolysis of triglycerides by pancreatic lipase resulting in an excess of free fatty acids and elevated chylomicrons, which are thought to increase plasma viscosity and induce ischemia and inflammation in pancreatic tissue. Although the clinical course of HTGP is similar to other forms of acute pancreatitis, the clinical severity and associated complications are significantly higher in patients with HTGP. Therefore, an accurate diagnosis is essential for treatment and prevention of disease recurrence. At present, there are no approved guidelines for the management of HTGP. Different treatment modalities such as apheresis/plasmapheresis, insulin, heparin, fibric acids, and omega-3 fatty acids have been successfully implemented to reduce serum triglycerides. Following acute phase management, lifestyle modifications including dietary adjustments and drug therapy are important for the long-term management of HTGP and the prevention of relapse. Additional studies are required to produce generalized and efficient treatment guidelines for HTGP.

Predictors of Malignancy in “Pure” Branch-Duct Intraductal Papillary Mucinous Neoplasm of the Pancreas without Enhancing Mural Nodules on CT Imaging: A Nationwide Multicenter Study

BACKGROUND/AIMS: Presence of enhanced mural nodules, which can be visualized using computed tomography (CT), is one of high-risk stigmata in branch-duct intraductal papillary mucinous neoplasms (BD-IPMNs). Conversely, the absence of enhanced mural nodules on preoperative imaging does not exclude malignant risk. The present study aimed to investigate other morphological features as predictors of malignancy in “pure” BD-IPMNs without enhanced mural nodules on CT. METHODS: This retrospective study included 180 patients with surgically confirmed “pure” BD-IPMNs of the pancreas and no enhanced mural nodules on preoperative CT. The study was conducted at 15 tertiary referral centers throughout South Korea. Univariate and multivariate analyses were used to identify significant predictors of malignancy. RESULTS: BD-IPMNs with low-grade (n=84) or moderate-grade (n=76) dysplasia were classified as benign; those with high-grade dysplasia (n=8) or invasive carcinoma (n=12) were classified as malignant. The multivariate analysis revealed that cyst size ≥30 mm (odds ratio, 8.6; p=0.001) and main pancreatic duct diameter ≥5 mm (odds ratio, 4.1; p=0.01) were independent risk factors for malignancy in “pure” BD-IPMNs without enhanced mural nodules on CT. Endoscopic ultrasound detected enhanced mural nodules (6/82) that had been missed on CT, and two IPMNs with enhanced mural nodules were malignant. CONCLUSIONS: In patients with “pure” BD-IPMNs who have no enhanced mural nodules on CT, cyst size ≥30 mm and main pancreatic duct diameter ≥5 mm may be associated with malignancy.

Painful nodule on umbilicus: Sister Mary Joseph nodule as an unusual but important manifestation of widespread gallbladder cancer

No abstract available.

ERCP-Related Duodenal Perforation; The Prevention and Management / 대한췌담도학회지

Endoscopic retrograde cholangiopancreatography (ERCP) is an invasive procedure carrying potential complication such as pancreatitis, hemorrhage, perforation and cholangitis. Most of those complications are mild and usually need a short additional hospitalization periods. Perforation, however, often requires surgical intervention and in this case, the rate of mortality is up to 10%. Prompt diagnosis and proper management are key determinants for successful outcome. For this, endoscopist should be aware of possibility of perforation before procedure especially in high risk patients with altered anatomy such as prior Billroth II or Roux-en-Y anastomosis. After diagnosis of perforation, multidisciplinary approach involving medical, surgical and radiologic interventional subspecialties, is essential. Usually, surgical treatment is needed for type I free wall perforation and medical and endoscopic treatments are recommended for type II-IV perforation. Recently, several anecdotal studies reported successful endoscopic treatment using new devices for type I duodenal wall perforation but it is not warranted that endoscopic treatments can substitute the surgical intervention.

Risk Factors for Severe Complications in Patients with Esophageal Foreign Bodies / 대한내과학회지

BACKGROUND/AIMS: Complications by ingested foreign bodies are uncommon, since successful removal by endoscopy occurs in most cases. However, severe complications, such as perforation, can result in death. The aim of this study was to determine the risk factors associated with severe complications in patients with esophageal foreign bodies. METHODS: This study involved 298 patients who underwent successful removal of an esophageal foreign body between January 2001 and December 2014 at Dankook University Hospital. Medical records were reviewed retrospectively. Severe complications were defined as laceration, unstoppable bleeding with simple irrigation, or perforation. Risk factors for severe complications were analyzed using multivariate logistic regression. RESULTS: The most common foreign bodies in adults and pediatrics were fish bones (52.0%) and coins (61.0%). Complications included erosion, ulcer, laceration, bleeding, and perforation. Using multivariate analysis, the type (fish bone, odds ratio [OR] = 2.306, p = 0.004) and size (> 25 mm, OR = 2.614, p = 0.001) of the obstruction and duration of impaction (> 24 hours, OR = 1.887, p = 0.035) were risk factors for severe complications including laceration, bleeding, and perforation. For perforation, duration of impaction (> 24 hours, OR = 41.700, p = 0.005) was a statistically significant risk factor. In two patients, delayed perforation occurred despite successful endoscopic removal of the foreign body. CONCLUSIONS: Patients with esophageal fish bone foreign bodies, foreign bodies larger than 25 mm, and a duration of impaction longer than 24 hours should be treated carefully considering the possibility of severe complications. Specifically, patients with a duration of impaction longer than 24 hours should be closely observed due to increased risk of perforation and potential delayed perforation even after successful endoscopic removal.

Three Cases of Diphyllobothrium nihonkaiense Infection in Korea

Until 2012, a total of 48 cases of diphyllobothriasis had been reported in Korea, all of which were morphologically identified as Diphyllobothrium latum. However, some of these specimens were analyzed by nucleotide sequencing of the mitochondrial cox1 gene, which showed that all were D. nihonkaiense, not D. latum. After that, 3 further cases of diphyllobothriasis were confirmed as D. nihonkaiense. In the present study, 3 new cases of D. nihonkaiense were detected from 2011 through 2013. The hosts were infected through consumption of salmonid fishes, such as the trout or salmon, and 2 of them experienced severe diarrhea prior to proglottid passage. All of the tapeworms were confirmed to be D. nihonkaiense by genetic identification. This proved again that most diphyllobothriasis in Korea have been caused by D. nihonkaiense.

A Case of a Huge Biliary Bezoar Treated with ESWL / 대한췌담도학회지

A bezoar is a mass formed by the accumulation of digested food. A biliary bezoar, namely a bezoar formed in the bile duct, is rare, which occurs mostly in patients who formerly underwent cholecystectomy. It appears that incompetent sphincter produces occasional reverse flow of foreign bodies including undigested food from the alimentary canal into the bile tract. Surgical treatment is used for huge biliary bezoar which is too huge to be removed by nonsurgical treatment. Extracorporeal shock wave lithotripsy (ESWL) is mostly used to fragment renal or urinary calculi, but may be sparingly used against biliary calculi. This is to report the rare case of a patient with biliary bezoar who formerly underwent open cholecystectomy and choledocoduodenostomy. The patient's huge biliary bezoar was removed by ESWL and the successive execution of endoscopic retrograde cholangio pancreatography (ERCP). ESWL is expected to be a comparatively safe and convenient solution to huge biliary bezoars.

Differential Expression of E-Cadherin, beta-Catenin, and S100A4 in Intestinal Type and Nonintestinal Type Ampulla of Vater Cancers

BACKGROUND/AIMS: Epithelial-mesenchymal transition (EMT)-related proteins may exhibit differential expression in intestinal type or pancreatobiliary type ampulla of Vater carcinomas (AVCs). We evaluated the expression of E-cadherin, beta-catenin, and S100A4 in intestinal and nonintestinal type AVCs and analyzed their relationships with clinicopathological variables and survival. METHODS: A clinicopathological review of 105 patients with AVCs and immunohistochemical staining for E-cadherin, beta-catenin, and S100A4 were performed. The association between clinicopathological parameters, histological type, and expression of EMT proteins and their effects on survival were analyzed. RESULTS: Sixty-five intestinal type, 35 pancreatobiliary type, and five other types of AVCs were identified. The severity of EMT changes differed between the AVC types; membranous loss of E-cadherin and beta-catenin was observed in nonintestinal type tumors, whereas aberrant nonmembranous beta-catenin expression was observed in intestinal type tumors. EMT-related changes were more pronounced in the invasive tumor margin than in the tumor center, and these EMT-related changes were related to tumor aggressiveness. Among the clinicopathological parameters, a desmoplastic reaction was related to overall survival, and the reaction was more severe in nonintestinal type than in intestinal type AVCs. CONCLUSIONS: Dysregulation of E-cadherin, beta-cadherin, and S100A4 expression may play a role in the carcinogenesis and tumor progression of AVCs.

The Seroprevalence Rate, Vaccination Rate and Seroconversion Rate of Hepatitis A in Central Region of Korea / 대한소화기학회지

BACKGROUND/AIMS: Acute hepatitis A (HAV) is markedly increasing recently on. Some patients with acute hepatitis A show severe clinical course. The seroprevalence rate of IgG anti-HAV has been changing with the regions and the times. Vaccination and seroconversion rate of HAV are not well known. In this study, we aimed to study the difference of seroprevalence rate of IgG anti-HAV according to various clinical factors and to know the vaccination rate and seroconversion rate below 10 years old in the central region of South Korea including Cheonan city. METHODS: Seven hundred seventy two subjects were included in the study from January to September 2009. We analyzed seroprevalence rate of IgG anti-HAV according to sex, age, region, and other viral markers. We interviewed the history of vaccination(1st, 2nd) and analyzed seroconversion rate according to vaccination time below 10 years old. RESULTS: The total seroprevalence rate of IgG anti-HAV was 65.3%. The seroprevalence rate of IgG anti-HAV rate in 2nd, 3rd, and 4th decade was very low (1.9%, 18.8%, 44.8%). The vaccination rate of children was about 50%. The seroconversion rate after 1st, and 2nd vaccination were 85%, 96%. CONCLUSIONS: Catch-up vaccination for teenagers and young adults is needed. Immunizing children with HAV vaccine as a routine schedule should be considered.

Two Granular Cell Tumors of the Colon with the Endosonographic Features / 대한소화기내시경학회지

Granular cell tumor is relatively uncommon, it is usually benign and it can be located anywhere throughout the body. It is uncommon in the digestive tract, and especially in the colon and rectum. The endosonographic features of granular cell tumor are usually a relatively hypoechoic, heterogenous lesion in the submucosa, but this tumor has rarely been reported in the colon. We report here on two cases of granular cell tumors of the colon that were observed by using endoscopic ultrasonograpy for making the differential diagnosis of a submucosal tumor and these tumors were confirmed by microscopic examinations after endoscopic mucosal resection.

An Ectopic Opening of the Common Bile Duct into the Duodenal Bulb: The Clinical Features and Endoscopic Treatment / 대한소화기내시경학회지

BACKGROUND/AIMS: An ectopic opening of the common bile duct (CBD) into the duodenal bulb is known to cause biliary tract diseases or peptic ulcer. Yet such a case is extremely rare and the clinical significance of this malformation has not yet been clarified. METHODS: Ten patients with an ectopic opening in the duodenal bulb and who were treated at 4 hospitals in the Chungcheong province area were enrolled. Their clinical and radiographic features and the treatment for their combined biliary diseases were retrospectively analysed. RESULTS: The mean age of the ten patients was 73 years (range: 38~84 years, 8 men, 2 women) Eight of 10 patients had clinical signs and symptoms (RUQ abdominal pain: 5, epigastric pain: 3, fever: 3, Melena: 1). The two patients without symptoms were incidentally found to have an ectopic orifice during the evaluation for bile duct dilatation and a regular health check-up, respectively. Nine had duodenal ulcer scars or bulb deformities. Four had active duodenal ulcers and one of them had bleeding from the active duodenal ulcer, which was treated by endoscopic sclerotheraphy. Six of the 10 patients (60%) had biliary tract diseases (CBD stones: 4, cholangitis without CBD stone: 1, IHD stone: 1). Cholangiography was used for evaluation in 9 patients, and it showed dilatation of the CBD or IHD in 7 (78%), a tapered common bile duct at the distal CBD in 7 (78%) and a hook-shaped distal CBD in 8 (89%). Six patients' biliary tract diseases were treated endoscopically (ERCP: 4, PTCS: 2). Duodenal perforation occurred in 1 (10%), who was successfully managed by medical treatment. CONCLUSIONS: An ectopic opening of the CBD in the duodenal bulb is frequently associated with recurrent duodenal ulcer and biliary tract disease. Combined biliary tract disease can be successfully treated endoscopically.

A Case of Hemocholecyst / 대한소화기학회지

No abstract available.

Acalculous Hemorrhagic Cholecystitis with Chronic Intraluminal Hematoma: MRI Findings

Acalculous hemorrhagic cholecystitis is a rare complication of acute cholecystitis and is associated with a high mortality rate. We present a case of acalculous hemorrhagic cholecystitis with hematoma in the gallbladder lumen, which was diagnosed using magnetic resonance imaging (MRI). The T1- & T2-weighted MRI revealed gallbladder distension with a hypointense intraluminal hematoma. The excellent tissue contrast provided by MRI is useful for detecting hematomas in the cases of hemorrhagic cholecystitis.

Common Bile Duct Obstruction Caused by Tumor Thrombus after Trans-arterial Chemoembolization in a Hepatocellular Carcinoma Patient / 대한소화기내시경학회지

The jaundice in hepatocellular carcinoma patient can be found when the tumor progresses or hepatic function deteriorates. Rarely, it can be occurred when the bile duct is obstructed. The main reason of obstructive jaundice in hepatocellular carcinoma is bile duct invasion of tumor, tumor thrombus, blood clot of hemobilia and direct bile compression by tumor or metastatic lymph node. Although the tumor thrombi among them is difficult to think, prompt diagnosis and treatment should be done because the symptom and prognosis can be improved by removal of the tumor thrombus. We experienced a case of hepatocellular carcinoma patient associated with obstructive jaundice caused by tumor thrombus after transarterial chemoembolization (TACE). The tumor thrombus was removed by endoscopic retrograde cholangiopancreatography (ERCP) and confirmed as degenerated hepatocellular carcinoma cell.