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Choe Junsu,Han Areum,Shin Sun Hye,Lee Kyungjong,Um Sang-Won,Kim Hojoong,Kim Tae Yeul,Huh Hee Jae,Choi Yoon-La,Han Joungho,Jeong Byeong-Ho 대한의학회 2023 Journal of Korean medical science Vol.38 No.47
Background: Paradoxical responses (PR) occur more frequently in lymph node tuberculosis (LNTB) than in pulmonary tuberculosis and present difficulties in differential diagnosis of drug resistance, new infection, poor patient compliance, and adverse drug reactions. Although diagnosis of mediastinal LNTB has become much easier with the development of endosonography, limited information is available. The aim of this study was to investigate the clinical course of mediastinal LNTB and the risk factors associated with PR. Methods: Patients diagnosed with mediastinal LNTB via endosonography were evaluated retrospectively between October 2009 and December 2019. Multivariable logistic regression was applied to evaluate the risk factors associated with PR. Results: Of 9,052 patients who underwent endosonography during the study period, 158 were diagnosed with mediastinal LNTB. Of these, 55 (35%) and 41 (26%) concurrently had pulmonary tuberculosis and extrapulmonary tuberculosis other than mediastinal LNTB, respectively. Of 125 patients who completed anti-tuberculosis treatment, 21 (17%) developed PR at a median of 4.4 months after initiation of anti-tuberculosis treatment. The median duration of anti-tuberculosis treatment was 6.3 and 10.4 months in patients without and with PR, respectively. Development of PR was independently associated with age < 55 years (adjusted odds ratio [aOR], 5.72; 95% confidence interval [CI], 1.81–18.14; P = 0.003), lymphocyte count < 800/μL (aOR, 8.59; 95% CI, 1.60–46.20; P = 0.012), and short axis diameter of the largest lymph node (LN) ≥ 16 mm (aOR, 5.22; 95% CI, 1.70–16.00; P = 0.004) at the time of diagnosis of mediastinal LNTB. Conclusion: As PR occurred in one of six patients with mediastinal LNTB during antituberculosis treatment, physicians should pay attention to patients with risk factors (younger age, lymphocytopenia, and larger LN) at the time of diagnosis.
선택적 촉매환원 장치 내부 유동 모사를 위한 다공성 매질 모델 개발
정원준(Wonjun Jung),한종호(Joungho Han),박한준(Han June Park),황원태(Wontae Hwang) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
The complex flow inside SCR facilities can be examined using computational fluid dynamics (CFD) simulations where the screen plate is modeled as porous media owing to its complex shape. This porous media model nominally utilizes the pressure loss across the screen plate. However, a-priori determination of the model is difficult if on-site pressure data are unavailable or additional laboratory experiments cannot be performed. We hereby describe the development of a method for the porous media approach based on mathematical modeling of the force balance on the screen. This allows us to utilize the porous media approach without having any pressure drop information. We conducted particle image velocimetry (PIV) experiments to first validate CFD simulations that fully resolved the screen plate. Subsequently, CFD results using the porous media approach with the newly developed mathematical model were compared to that of the fully resolved simulations, and the overall flow structure including the main recirculation zone was shown to be similar. Thus, using the newly developed mathematical model, the internal flow field in complex engineering systems such as an SCR facility can be rapidly obtained with less computational cost and reasonable accuracy.
( Yoon Jin Cha ),( Joungho Han ),( Min Ju Lee ),( Kyung Soo Lee ),( Hojoong Kim ),( Jeail Zo ) 대한결핵 및 호흡기학회 2015 Tuberculosis and Respiratory Diseases Vol.78 No.4
Epithelial-myoepithelial carcinoma (EMC) of lung is a minor subset of salivary type carcinoma of lung of known low grade malignancy. Histologically, two-cell components forming duct-like structure with inner epithelial cell layer and outer myoepithelial cell layer are characteristics of EMC. In salivary gland, dedifferentiation of conventional low grade malignancy has been reported and is thought to be related with poor prognosis. However, precise histomorphology and prognostic factors of pulmonary EMC have not been clarified due to its rarity. Herein, we reported a rare case of EMC presented as endobronchial mass in a 53-year old woman, which showed predominant solid lobular growth pattern and lymph node metastases.
Cha, Yoon Jin,Han, Joungho,Lee, Min Ju,Lee, Kyung Soo,Kim, Hojoong,Zo, Jeail The Korean Academy of Tuberculosis and Respiratory 2015 Tuberculosis and Respiratory Diseases Vol.78 No.4
Epithelial-myoepithelial carcinoma (EMC) of lung is a minor subset of salivary type carcinoma of lung of known low grade malignancy. Histologically, two-cell components forming duct-like structure with inner epithelial cell layer and outer myoepithelial cell layer are characteristics of EMC. In salivary gland, dedifferentiation of conventional low grade malignancy has been reported and is thought to be related with poor prognosis. However, precise histomorphology and prognostic factors of pulmonary EMC have not been clarified due to its rarity. Herein, we reported a rare case of EMC presented as endobronchial mass in a 53-year old woman, which showed predominant solid lobular growth pattern and lymph node metastases.
( Ji Youn Sung ),( Joungho Han ),( Young Lyun Oh ),( Gee Young Suh ),( Kyeong Man Jeon ),( Tae Eun Kim ) 대한결핵 및 호흡기학회 2011 Tuberculosis and Respiratory Diseases Vol.71 No.5
Background: Pneumocystis jirovecii is a fungus that has become an important cause of opportunistic infections. We present a summary of the clinical status and findings from bronchoalveolar lavage (BAL) of patients with Pneumocystis jirovecii pneumonia (PJP). Methods: We selected 30 cases of PJP that were proven through a surgical specimen evaluation. BAL fluid cytology was reviewed, and agreement with the initial diagnosis was evaluated. Results: All 30 cases of PJP occurred in immunocompromised patients. Only 15 of the 30 cases were initially diagnosed as PJP. We found PJP in 13 of the 15 cases that were negative at the initial diagnosis. The most characteristic finding of PJP was frothy exudates, and BAL fluid tended to show rare neutrophils. Two of seven patients with PJP and diffuse alveolar damage (DAD) revealed no frothy exudates in BAL fluid. Conclusion: BAL fluid cytology was reconfirmed as a sensitive and rapid method to diagnose PJP. We must be aware of the possibility of PJP to maintain high diagnostic sensitivity. We cannot exclude PJP in cases of PJP with DAD, even if frothy exudates are not observed in the BAL fluid.
Bronchoalveolar lavage in fibrotic idiopathic interstitial pneumonias
Ju Ryu, Yon,Pyo Chung, Man,Han, Joungho,Kim, Tae Sung,Lee, Kyung Soo,Chun, Eun-Mi,Kyung, Sun Young,Jeong, Sung Hwan,Colby, Thomas V.,Kim, Hojoong,Kwon, O. Jung Bailliere Tindall,in association with the British 2007 Respiratory medicine Vol.101 No.3
<P><B>Summary</B></P><P>The purpose of this study was to assess the role of bronchoalveolar lavage (BAL) in differentiating usual interstitial peumonia (UIP) from non-specific interstitial pneumonia (NSIP) and in predicting the prognosis in fibrotic idiopathic interstitial pneumonia (IIP). A retrospective review of 122 patients (age 58±8 years, 70 male) with UIP (n=87) and NSIP (n=35) was carried out. Prior to surgical lung biopsy, all of them underwent BAL and high-resolution-computed tomography (HRCT) of the chest. Neutrophil count in BAL fluid was higher in UIP (7.0%) than NSIP (3.0%) (P=0.027). In contrast, BAL lymphocyte count was significantly higher in NSIP (29.0%) than UIP (5.5%) (P<0.0001). In 62 patients whose HRCT findings were atypical for UIP, BAL lymphocytosis was more frequently observed in NSIP (20/33) than UIP (4/29) (P<0.001) and the absence of BAL lymphocytosis suggested a diagnosis of UIP rather than NSIP (odds ratio 12.7, P<0.001). Pathologic diagnosis of NSIP was the only independent factor predicting a longer survival of our patients (median follow-up 21 months) (hazard ratio (HR) 0.035, P=0.005). When NSIP was not included in the survival analysis, higher BAL lymphocyte count was the only independent predictor of a longer survival (HR 0.909, P=0.029). BAL is an useful non-invasive tool in fibrotic IIP, not only for excluding a variety of specific non-IIP diseases but also for narrowing the differential diagnosis and predicting the prognosis in the absence of the histopathologic diagnosis.</P>