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진정연,윤호중 연세대학교의과대학 2014 Yonsei medical journal Vol.55 No.4
Purpose: The effect of radiofrequency catheter ablation (RFCA) on left atrial (LA) volume and function in patients with paroxysmal atrial fibrillation (PAF) has not been extensively studied. The aim of this study was to evaluate the long-term impact of RFCA on LA volume and function in patients with PAF. Materials and Methods: A total of 90 patients with drug-refractory PAF who had sinus rhythm on the initial echocardiogram were examined at baseline, 3 months and 1 year afterablation. We measured LA volume index, LA ejection fraction (LAEF; maximal--minimal LA volume/maximal LA volume), and LA active emptying fraction (LAAEF; mid-diastolic--minimal LA volume/mid-diastolic LA volume). Results: After 12±1 months, 78 patients returned, and 61 patients (78%) had sinus rhythm. After 3 months, the LA maximal volume indices decreased (from 33±13 to 28±12 mL/m2; p<0.001). But, LAEF and LAAEF also decreased (from 48±13 to 39±12; p<0.001, from 27±13 to 19±11; p<0.001). After 1 year, LA volumes, LAEF, and LAAEF remained similar at 3 months. In patients without atrial fibrillation (AF) recurrence, LAEF and LAAEF decreased after 3 months (from 50±12 to 40±11; p<0.001, from 29±13 to 22±11; p<0.001) and did not change after 1 year. However,in patients with AF recurrence, those who did not have decreased levels after 3 months had significantly decreased after 1 year (from 43±14 to 34±11; p=0.026, from 22±12 to 15±10; p=0.012). Conclusion: Successful RFCA of PAF decreased LA volume and function at 3 months. At one year, LA volume and function was remained unchanged in successfully ablated patients whereas LA function in patientswith AF recurrence worsened.
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Extensive Primary Cardiac Lymphoma Diagnosed by Percutaneous Endomyocardial Biopsy
진정연,이재학,맹일호,정수연,황희정,윤호중,정미향,김진진,김지현,이재범 한국심초음파학회 2009 Journal of Cardiovascular Imaging (J Cardiovasc Im Vol.17 No.4
Primary cardiac lymphoma (PCL) is an extranodal non-Hodgkin’s lymphoma exclusively located in the heart and/or pericardium. It is rare in immunocompetent patients and represents 1.3% of primary cardiac tumors and 0.5% of extranodal lymphomas. The clinical behavior is aggressive and the early symptoms are cardiac failure, syncope, arrhythmia, or pericardial effusion. Although echocardiography, computed tomography (CT) scan, magnetic resonance image (MRI) are the mainly used imaging techniques to detect cardiac tumors, pathologic examination is always required to confirm the diagnosis. Diagnosis of PCL is difficult due to non-specific clinical manifestations and requires invasive approach to get histopathologic evidence. While surgery with systemic chemotherapy or in combination with irradiation has been attempted, the only effective treatment is chemotherapy. However, the prognosis remains poor. We report on a 42-year-old woman who is diagnosed histopathologically as PCL by cardiac catheterization assisted percutaneous endomyocardial biopsy and treated successfully by anthracycline based chemotherapy. Primary cardiac lymphoma (PCL) is an extranodal non-Hodgkin’s lymphoma exclusively located in the heart and/or pericardium. It is rare in immunocompetent patients and represents 1.3% of primary cardiac tumors and 0.5% of extranodal lymphomas. The clinical behavior is aggressive and the early symptoms are cardiac failure, syncope, arrhythmia, or pericardial effusion. Although echocardiography, computed tomography (CT) scan, magnetic resonance image (MRI) are the mainly used imaging techniques to detect cardiac tumors, pathologic examination is always required to confirm the diagnosis. Diagnosis of PCL is difficult due to non-specific clinical manifestations and requires invasive approach to get histopathologic evidence. While surgery with systemic chemotherapy or in combination with irradiation has been attempted, the only effective treatment is chemotherapy. However, the prognosis remains poor. We report on a 42-year-old woman who is diagnosed histopathologically as PCL by cardiac catheterization assisted percutaneous endomyocardial biopsy and treated successfully by anthracycline based chemotherapy.
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수중대향충돌 처리를 통한 β-키토산 나노섬유 필름의 기계적 강도 향상
장세연,김중권,진정호 한국키틴키토산학회 2020 한국키틴키토산학회지 Vol.25 No.3
Squid pen-derived β-chitosan nanofibers (ChiNF) were obtained using an aqueous counter collision (ACC) method – a typical top-down process to produce nanofibers of natural polymers – according to different number of ACC treatments (pass) as a variable. Transparent free-standing β-chitosan films were solvent-casted from aqueous acetic acid (AA) solutions of ChiNF, raw β-chitosan powder as well as their mixture, of which dissolution time, X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, and tensile test results were compared to reveal the basic structure-property relationship. The ACC-derived β-chitosan ChiNF retained the crystalline and chemical structure of the raw β-chitosan with a slight decrease in the crystallinity index. In addition, the mechanical properties of the free-standing β-chitosan films could be tuned according to the relative amount of ChiNF and β-chitosan raw powder.
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전기방사 키틴 나노섬유로 강화된 실크 피브로인 기반 투명 복합 필름
장세연,송명오,강석주,진정호 한국키틴키토산학회 2021 한국키틴키토산학회지 Vol.26 No.1
Here, we introduce transparent chitin-silk fibroin composite film, which shows excellent optical and mechanical properties. We fabricated transparent chitin-silk fibroin composite film by impregnating the chitin membranes with an aqueous silk fibroin solution. Chitin membrane is simply produced by an electrospinning process. The chitin-silk fibroin composite film was analyzed by Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), UV-vis spectrometry, and tensile test. It was confirmed through the SEM image that the chitin membrane was completely impregnated with an aqueous silk fibroin solution. The chitin membrane impregnated with an aqueous silk fibroin solution has a transmittance of 89%. Moreover, the mechanical properties of the chitin-silk fibroin composite films were improved compared to the silk fibroin film.
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Tricuspid and pulmonary valve endocarditis associated with double-chambered right ventricle
명진철,진정연,최진호,나영민,박준형 고신대학교(의대) 고신대학교 의과대학 학술지 2015 고신대학교 의과대학 학술지 Vol.30 No.1
We report a rare case of tricuspid valve and pulmonary valve endocarditis associated with a double-chambered right ventricle in an adult female with pulmonary artery aneurysm and septic pulmonary embolism by Streptococcus mitis. She was treated with aggressive antibiotic therapy followed by debridement of the infective lesion of tricuspid valve, pulmonary valve replacement using xenograft and resection of obstructing muscular bundles in right ventricle.
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