A Novel Powered Nasal Irrigation After Endoscopic Sinus Surgery in Patients With Chronic Rhinosinusitis: A Preliminary Study / 대한이비인후과학회지

Background and Objectives@#We aimed to compare the efficacy of a novel powered irrigation system with that of the manual bottle-squeeze method for postoperative healing after endoscopic sinonasal surgery (ESS).Subjects and Method In this prospective randomized clinical trial, 29 patients were enrolled for nasal irrigation (NI) with either NOSSHA® (Womens Care Co., Ltd.) powered irrigation system (NOSSHA® group, n=14) or manual irrigation (control group, n=15). Objective findings were evaluated using the modified Lund-Kennedy scores. Subjective outcomes were assessed using the total nasal endoscopic score (TNES), total nasal symptom score (TNSS), visual analog scale (VAS), and quality of life (QOL) questionnaires in each group at baseline, and 1, 2, 4, 6, and 8 weeks after ESS. We compared the postoperative changes between both groups. @*Results@#The mean TNES of patients were significantly higher in the NOSSHA® group than in the control group (p=0.015); however, the improvement in TNES was achieved 2 weeks earlier in the NOSSHA® group. The improvement in TNES (p<0.001) and TNSS (p<0.001) was statistically significant in both groups. The improvement in QOL was statistically significant in the NOSSHA® (p<0.001) and control group (p=0.007). The improvement in the TNSS and QOL was earlier in the NOSSHA® group by 4 and 7 weeks, respectively; no early improvement occurred in the NOSSHA® group for the VAS score. @*Conclusion@#We validated the usefulness of postoperative NI using a powered device, which may be useful for patients who cannot tolerate manual NI.

Association between Texture Analysis Parameters and Molecular Biologic KRAS Mutation in Non-Mucinous Rectal Cancer

Purpose@#To evaluate the association between magnetic resonance imaging (MRI)-based texture parameters and Kirsten rat sarcoma viral oncogene homolog (KRAS) mutation in patients with non-mucinous rectal cancer. @*Materials and Methods@#Seventy-nine patients who had pathologically confirmed rectal nonmucinous adenocarcinoma with or without KRAS-mutation and had undergone rectal MRI were divided into a training (n = 46) and validation dataset (n = 33). A texture analysis was performed on the axial T2-weighted images. The association was statistically analyzed using the Mann-Whitney U test. To extract an optimal cut-off value for the prediction of KRAS mutation, a receiver operating characteristic curve analysis was performed. The cut-off value was verified using the validation dataset. @*Results@#In the training dataset, skewness in the mutant group (n = 22) was significantly higher than in the wild-type group (n = 24) (0.221 ± 0.283; -0.006 ± 0.178, respectively, p = 0.003). The area under the curve of the skewness was 0.757 (95% confidence interval, 0.606 to 0.872) with a maximum accuracy of 71%, a sensitivity of 64%, and a specificity of 78%. None of the other texture parameters were associated with KRAS mutation (p > 0.05). When a cut-off value of 0.078 was applied to the validation dataset, this had an accuracy of 76%, a sensitivity of 86%, and a specificity of 68%. @*Conclusion@#Skewness was associated with KRAS mutation in patients with non-mucinous rectal cancer.

Association between Texture Analysis Parameters and Molecular Biologic KRAS Mutation in Non-Mucinous Rectal Cancer

Purpose@#To evaluate the association between magnetic resonance imaging (MRI)-based texture parameters and Kirsten rat sarcoma viral oncogene homolog (KRAS) mutation in patients with non-mucinous rectal cancer. @*Materials and Methods@#Seventy-nine patients who had pathologically confirmed rectal nonmucinous adenocarcinoma with or without KRAS-mutation and had undergone rectal MRI were divided into a training (n = 46) and validation dataset (n = 33). A texture analysis was performed on the axial T2-weighted images. The association was statistically analyzed using the Mann-Whitney U test. To extract an optimal cut-off value for the prediction of KRAS mutation, a receiver operating characteristic curve analysis was performed. The cut-off value was verified using the validation dataset. @*Results@#In the training dataset, skewness in the mutant group (n = 22) was significantly higher than in the wild-type group (n = 24) (0.221 ± 0.283; -0.006 ± 0.178, respectively, p = 0.003). The area under the curve of the skewness was 0.757 (95% confidence interval, 0.606 to 0.872) with a maximum accuracy of 71%, a sensitivity of 64%, and a specificity of 78%. None of the other texture parameters were associated with KRAS mutation (p > 0.05). When a cut-off value of 0.078 was applied to the validation dataset, this had an accuracy of 76%, a sensitivity of 86%, and a specificity of 68%. @*Conclusion@#Skewness was associated with KRAS mutation in patients with non-mucinous rectal cancer.

Texture Analysis of Gray-Scale Ultrasound Images for Staging of Hepatic Fibrosis

Purpose@#To evaluate the feasibility of texture analysis of gray-scale ultrasound (US) images for staging of hepatic fibrosis. @*Materials and Methods@#Altogether, 167 patients who had undergone routine US and laboratory tests for a fibrosis-4 (FIB-4) index were included. Texture parameters were measured using a dedicated in-house software. Regions of interest were placed in five different segments (3, 5, 6, 7, 8) for each patient. The FIB-4 index was used as the reference standard for hepatic fibrosis grade. Comparisons of the texture parameters between different fibrosis groups were performed with the Student’s t-test or Mann-Whitney U-test. Diagnostic performance was evaluated by receiver operating curve analysis. @*Results@#The study population comprised of patients with no fibrosis (FIB-4 3.25, n= 53). Skewness in hepatic segment 5 showed a difference between patients with no fibrosis and mild fibrosis (0.2392 ± 0.3361, 0.4134 ± 0.3004, respectively, p = 0.0109). The area under the curve of skewness for discriminating patients with no fibrosis from those with mild fibrosis was 0.660 (95% confidence interval, 0.551–0.758), with an estimated accuracy, sensitivity, specificity of 64%, 87%, 48%, respectively. @*Conclusion@#A significant difference was observed regarding skewness in segment 5 between patients with no fibrosis and patients with mild fibrosis.

Transcanal Endoscopic Ear Surgery with Piezoelectric Device for External Auditory Canal Lesions / 대한이비인후과학회지

External auditory canal exostosis (EACE) is prone to occur in patients frequently exposed to cold water, which causes earwax impaction, recurrent otitis externa, and conductive hearing loss. The main treatment for symptomatic EACE is surgical excision. External auditory canal cholesteatoma (EACC) is a bone-destructive cystic mass caused by accumulation of plugs of desquamated keratin debris in the external auditory canal (EAC), which is also mainly treated with surgical removal. The main difficulties in the surgical removal of obstructive EACEs or EACCs are related to the adjacency of EAC skin, tympanic membrane, temporomandibular joint, and the blockage of the medial EAC landmarks during the operation. The piezoelectric device (PZD), which has long been used to cut bony structures in dental surgery, has clinical advantages here with regards to accurate exclusive bone cutting ability and minimal heat production. We report a series of cases that managed EAC lesions using PZD.

MRI Assessment of Complete Response to Preoperative Chemoradiation Therapy for Rectal Cancer: 2020 Guide for Practice from the Korean Society of Abdominal Radiology

Objective@#To provide an evidence-based guide for the MRI interpretation of complete tumor response after neoadjuvant chemoradiation therapy (CRT) for rectal cancer using visual assessment on T2-weighted imaging (T2) and diffusion-weighted imaging (DWI). @*Materials and Methods@#PubMed MEDLINE, EMBASE, and Cochrane Library were searched on November 28, 2019 to identify articles on the following issues: 1) sensitivity and specificity of T2 or DWI for diagnosing pathologic complete response (pCR) and the criteria for MRI diagnosis; 2) MRI alone vs. MRI combined with other test(s) in sensitivity and specificity for pCR; and 3) tests to select patients for the watch-and-wait management. Eligible articles were selected according to meticulous criteria and were synthesized. @*Results@#Of 1615 article candidates, 55 eligible articles (for all three issues combined) were identified. Combined T2 and DWI performed better than T2 alone, with a meta-analytic summary sensitivity of 0.62 (95% confidence interval [CI], 0.43– 0.77; I2 = 80.60) and summary specificity of 0.89 (95% CI, 0.80–0.94; I2 = 92.61) for diagnosing pCR. The criteria for the complete response on T2 in most studies had the commonality of remarkable tumor decrease to the absence of mass-like or nodular intermediate signal, although somewhat varied, as follows: (near) normalization of the wall; regular, thin, hypointense scar in the luminal side with (near) normal-appearance or homogeneous intermediate signal in the underlying wall; and hypointense thickening of the wall. The criteria on DWI were the absence of a hyperintense signal at high b-value (≥ 800 sec/mm2) in most studies. The specific algorithm to combine T2 and DWI was obscure in half of the studies. MRI combined with endoscopy was the most utilized means to select patients for the watch-and-wait management despite a lack of strong evidence to guide and support a multi-test approach. @*Conclusion@#This systematic review and meta-analysis provide an evidence-based practical guide for MRI assessment of complete tumor response after CRT for rectal cancer.

A Case of Lateral Ectopic Thyroid Mimicking the Metastatic Lymphadenopathy / 대한이비인후과학회지

Ectopic thyroid means that thyroid tissue is present at an unusual area rather than at the orthotropic thyroid position. The most common form of ectopic thyroid is lingual thyroid, followed by thyroglossal duct cyst. Ectopic thyroid in the lateral neck area is extremely rare, with only a few case reports found in the literature review. Several studies recommended that metastasizing malignancy should be considered in lateral ectopic thyroid. Described here is a case of 60 year-old woman with lateral ectopic thyroid, which was newly found during a follow-up and was mistaken for metastatic lymphadenopathy.

Helical Rim Advancement Flap with an Additional Postauricular Skin Flap: A Case Report

The auricle is a three-dimensional cartilaginous frame covered with thin overlying skin. Due to its complex features, reconstructing helical rim defects after the excision of an auricular mass is challenging. Shortage of subcutaneous tissue and the presence of a tightly bound epithelium further hamper the primary closure of lateral (anterior) auricular skin defects. We present herein a case in which we used a helical rim advancement flap along with an additional postauricular skin flap. We achieved a satisfactory esthetic result with minimal loss of helical diameter and a low risk of flap necrosis by preserving the vascular network of the flap. This technique is less traumatic and will facilitate faster healing as well as improved patient recovery.

A Case of Lateral Ectopic Thyroid Mimicking the Metastatic Lymphadenopathy / 대한이비인후과학회지

Ectopic thyroid means that thyroid tissue is present at an unusual area rather than at the orthotropic thyroid position. The most common form of ectopic thyroid is lingual thyroid, followed by thyroglossal duct cyst. Ectopic thyroid in the lateral neck area is extremely rare, with only a few case reports found in the literature review. Several studies recommended that metastasizing malignancy should be considered in lateral ectopic thyroid. Described here is a case of 60 year-old woman with lateral ectopic thyroid, which was newly found during a follow-up and was mistaken for metastatic lymphadenopathy.

Hepatocellular Carcinoma with Vascular Central Scar / 대한소화기학회지

No abstract available.

Added Value of Diffusion Weighted Imaging for Detecting Pancreatic Abnormality in Patients with Clinically Suspected Acute Pancreatitis

PURPOSE: To evaluate the added value of diffusion weighted imaging (DWI) to computed tomography (CT) for detecting pancreatic abnormality in patients with clinically suspected acute pancreatitis (AP). MATERIALS AND METHODS: 203 patients who underwent abdomen CT and subsequent DWI to do a workup for epigastric pain were analyzed. Two blinded radiologists independently performed an interval reading based on CT image sets first, then based on combined CT and DWI image sets. The diagnostic criterion on DWI was the increased signal intensity in the pancreas to that of the spleen. For quantitative analysis, the third radiologist measured ADC value of the pancreas in each patient. RESULTS: For AP (n = 43), the sensitivity for detecting pancreatic abnormality increased, from 42% to 70% for reader 1 (P < 0.05) and from 44% to 72% for reader 2 (P < 0.05). For borderline pancreatitis (n = 42), the sensitivity also increased, from 10% to 26% for reader 1 (P < 0.05) and from 7% to 29% for reader 2 (P < 0.05). The mean ADC values (unit, × 10⁻³ mm²/s) were significantly different among the three groups (for AP, 1.09 ± 0.16; for borderline pancreatitis, 1.28 ± 0.2; for control, 1.46 ± 0.15, P < 0.05). CONCLUSIONS: Sensitivity for detecting pancreatic abnormality increased significantly after adding DWI to CT in patients with clinically suspected AP.

Synchronous Hepatocellular Carcinoma and B-Cell Non-Hodgkin's Lymphoma in Chronic Hepatitis C Patient / 대한소화기학회지

Hepatitis C virus (HCV) is one of the main viral causes of hepatocellular carcinoma (HCC) and is associated with lymphoproliferative disorder such as non-Hodgkin's lymphoma (NHL). However, there are only few case reports on concomitantly induced NHL and HCC by HCV. Herein, we report a case of synchronous NHL and HCC in a patient with chronic hepatitis C which was unexpectedly diagnosed during liver transplantation surgery. This case suggests that although intrahepatic lymph node enlargements are often considered as reactive or metastatic lymphadenopathy in chronic hepatitis C patients with HCC, NHL should also be considered as a differential diagnosis.

The current status and development of a skill examination for the Korean speciality certification examination

The Specialty Certification Examination is an important part of the assessment of medical education. However, the step 2 skill examinations of 26 medical specialties in Korea are insufficient with respect to achieving the objective of practical examinations that evaluate clinical skill and competence. Among the current step 2 skill examination methods, picture testing using slides or reading of pathology slides/radiologic images is more suitable for testing cognition and knowledge than for testing performance. The oral examination has low reliability because of its relatively short testing period and absence of scoring criteria. In addition, the Specialty Certification Examination is a high-stakes test and the performance during the training course is not reflected in the skill examination. We have reviewed the various skill examinations including clinical practice examinations, objective structured clinical examinations of the United States and Canada, and work-based assessments of the United Kingdom. Based on the review, we suggest some plans for improving the Korean Specialty Certification Examination.

The Prevalence of Os Acromiale in Korean Patients Visiting Shoulder Clinic

BACKGROUND: The prevalence of os acromiale has been documented to be between 1% and 15% and is known to be clinically associated with subacromial impingement or rotator cuff tear. However, the prevalence of os acromiale in Korea has not yet been determined. The purpose of this study is to evaluate the prevalence of os acromiale in Korean patients who visited shoulder clinics and to investigate the correlations with rotator cuff tear. METHODS: We retrospectively reviewed the X-rays of patients visiting a shoulder clinic at a tertiary hospital in Korea from January 2011 to January 2012 to determine the frequency of os acromiale. X-ray findings were confirmed with magnetic resonance imaging (MRI) for patients who had these images available. MRI was also used to assess the status of the rotator cuff. The correlation between the presence of os acromiale either with gender, hand dominance or rotator cuff tear was analyzed statistically. RESULTS: A total of 2,946 shoulders from 1,568 patients were analyzed with X-rays. Thirteen cases out of 1,568 patients had an os acromiale; and there were five and eight cases of pre-acromiale and meso-acromiale, respectively. Thus, the prevalence of os acromiale in this study population was found to be 0.7 (7 cases per 1,000 patients). Bilaterality was found in two cases. Os acromiale was not more frequent according to gender (five males versus eight females, p = 0.525) and hand dominance was not associated with frequency of os acromiale (seven dominant arms versus six non-dominant arms, p = 0.631). A sub-analysis of shoulders with available MRIs (1,074 shoulders) revealed that there were two rotator cuff tears (40%) out of five cases of os acromiale, whereas 607 rotator cuff tears were observed (57%) among 1069 cases without os acromiale. This difference was not statistically significant (p = 0.656). CONCLUSIONS: The identified prevalence of os acromiale in Korean patients who visited shoulder clinics is 0.7%, which is much lower as compared with the prevalence of general population from other ethnic groups. No correlation was observed between rotator cuff tears and os acromiale in this study population.

Antidote for acetaminophen poisoning: N-acetylcysteine

N-acetylcysteine (NAC) is widely recognized as the antidote of choice for acetaminophen overdose. Acetaminophen is a commonly used analgesic and antipyretic agent, and its use is one of the most common causes of poisoning worldwide. Acetaminophen toxicity may occur acutely when supratherapeutic amounts are ingested purposefully or unintentionally. Liver failure may occur in severe toxicity. However, if treated early, patients with acetaminophen poisoning generally recover uneventfully. Acetaminophen is metabolized to N-acetyl-p-benzoquinone imine (NAPQI), which is detoxified by conjugation with glutathione. In overdose, hepatic stores of glutathione are depleted and NAPQI binding to hepatocytes induces cell death and hepatic necrosis. NAC replenishes hepatic glutathione and may also act as a glutathione substitute, combining directly with the toxic metabolite. Intravenous NAC is indicated in patients who present with a history of acetaminophen overdose within the previous 8 to 10 hours, patients unable to tolerate oral NAC, and patients who present with evidence of fulminant hepatic failure. However, caution should be used in patients who have experienced previous hypersensitivity or anaphylactoid reactions to intravenous NAC, as well as in patients with asthma. The most common anaphylactoid reactions include rash, flushing, and bronchospasm. Adults should receive 150 mg/kg administered for 45 minutes, followed by 50 mg/kg administered for 4 hours, followed by 100 mg/kg administered for 16 hours. The total dose is 300 mg/kg delivered over 21 hours. Additionally, caution should always be used when intravenous NAC is prescribed and the amount of diluent is calculated. Monitoring of patients with a should include repeated neurologic and hemodynamic assessment.

Association of the Adiponectin Gene Variations with Risk of Ischemic Stroke in a Korean Population

PURPOSE: Stroke is the second leading cause of death and a major cause of morbidity and mortality worldwide. Evidence of variations in adiponectin(AdipoQ) genes that are associated with ischemic stroke has not been consistent, and it is unclear whether the same loci contribute to these associations in the Korean population. Using a Korean population, we tested ischemic stroke-associated AdipoQ markers. MATERIALS AND METHODS: In a preliminary genome-wide association study using 320 250 k Affymetrix NSP chips, AdipoQ was found to be associated with ischemic stroke in Koreans. To study of AdipoQ, a further 673 ischemic stroke patients and 267 unrelated individuals without a history of stroke or transient ischemic attack were examined in a case-control study. RESULTS: Six polymorphisms (rs182052G > A, rs16861205G > A, rs822391T > C, rs822396A > G, rs12495941G > T and rs3774261A > G) that had a minor allele frequency of over 1% were strongly associated with stroke (p C and rs822396A > G showed this association on both dominant and additive logistic regression analysis after adjusting for age and sex. The haplotypes ht 1 (AGGCGG and AAGTAG) were significantly associated with susceptibility to stroke. CONCLUSION: Our findings show that polymorphisms in AdipoQ are associated with risk for ischemic stroke in the Korean population. This study lends further support to the putative role of AdipoQ in stroke.

Orthopedic disease and sports medicine in shoulder joint

Recent developments in biomechanics and technology have improved our understanding of the shoulder joints. While the shoulder joint is the one of the most mobile joints in the human body, its stability mostly relies on soft tissue structures such as the glenoid labrum and capsular ligament. Traumatic anterior instability is the most common instability related to sports injury. Younger individuals have a higher rate of recurrence after nonoperative treatment after the first-time episode of anterior instability. Arthroscopic repair of the Bankart lesion provides reliable outcomes in most of the anterior instability, while selected patients with significant bone loss may require bony augmentation procedures. Posterior instability has been underestimated. Sports injury is commonly associated with symptomatic posterior instability, and posterior labral lesions are commonly found. Arthroscopic reconstruction of the posteroinferior height and ligament balance is required. Superior labral lesions are a commonly diagnosed disease in the shoulder. Care must be taken to avoid unnecessary surgical procedures especially in nonathletic populations without significant traumatic episodes. Partial articular surface tears are common among sports related rotator cuff injuries. Symptomatic articular surface tears require arthroscopic treatment such as debridement or trans-tendon repair.

Repetitive single subarachnoid injections for trial administration of the intrathecal morphine pump in patients with intractable non-cancer pain: A case report / 대한마취과학회지

Since the early 1980s, the implantable intrathecal drug pump (ITDP) has been used increasingly to manage chronic pain. Prior to making a decision to implant an ITDP, trial administration of the intrathecal (IT) drug should be performed to estimate the effective dose for a starting set of implantable ITDPs. There is no standard method of trial IT drug administration, though. Therefore, this paper reports 20 cases of IT morphine trial with single and repetitive injections until the appropriate dose was attained with respect to analgesia and its side effects. The trial procedure was performed with daily sequential IT injections using morphine and 0.3% mepivacaine. Twelve out of the total of 20 patients had positive responses. Thus, it is inferred that daily sequential IT morphine injections combined with a placebo injection as a trial ITDP would be useful in evaluating the effectiveness and adverse effects of IT morphine infusion with clinically insignificant side effects.

Emergency Airway Management Using a Glidescope Video Laryngoscope in Trauma Patients

PURPOSE: To describe the current status of airway management for trauma patients in the emergency department (ED) and to evaluate the success rate and associated factors for selecting the Glidescope video laryngoscope. METHODS: This was a retrospective observational study of prospectively collected data from the Koran Emergency Airway Management Registry in two university hospitals between April 2006 and March 2010. The study population included all trauma patients presenting at the ED who required emergency airway management. Demographic and airway related parameters were collected. The success rate was compared between the Glidescope and the direct laryngoscope. Factors associated with selecting the Glidescope were analyzed using multiple logistic regression. RESULTS: Among the 1,974 patients who received airway management in the ED during the study period, 341 were identified as trauma patients. The Glidescope was used in 130 (38%) of the patients. Difficult airway was identified in 46.9% of the Glidescope group compared with 22.6% in the direct laryngoscope group (p<0.001). Success rate on the first attempt was not different between the direct laryngoscope and the Glidescope. The Glidescope was selected in favor of cervical immobilization, difficult airway, and senior grade resident. CONCLUSION: Among intubated patients in the ED, trauma patients accounted for 17.6%. The Glidescope video laryngoscope was selected in 38% of cases. It was usually used in cases of difficult airway such as cervical immobilization by senior grade residents.

Early Diagnosis of Fabry Disease in a Patient with Toe Tip Pain

Fabry disease is an X-linked lysosomal disease caused by deficiency of alpha-galactosidase, in which early diagnosis may be missed due to the wide variety of clinical symptoms presenting during disease progression. A 13 year-old boy visited our pain clinic complaining of pricking and burning pain in the toe tips of both feet. Continuous epidural infusion for pain management was performed because of oral analgesics ineffectiveness. The patient underwent alpha-galactosidase A (GLA) enzyme analysis based on the clinical impression of Fabry disease from pain with a peripheral neuropathic component and history of anhidrosis. He was diagnosed with Fabry disease after confirming mutation of the GLA gene through a screening test of GLA activity. Enzyme replacement therapy was initiated and pain was tolerated with oral analgesics.