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Supraventricular Tachycardia and Sinus Rhythm with Contralateral Bundle Branch Block Patterns
Seongwook Han,John M Miller,Mithilesh Kumar Das 대한심장학회 2014 Korean Circulation Journal Vol.44 No.4
A contralateral bundle branch block (BBB) aberration during tachycardia with a preexisting BBB strongly suggests the presence of ven-tricular tachycardia. We report on a middle-aged, female patient presented with wide QRS tachycardia. The patient had orthodromicatrioventricular tachycardia with a left BBB aberration in the presence of a preexisting right BBB due to an abnormal His-Purkinje system. We learned that the contralateral BBB aberration with supraventricular tachycardia could be seen when the His-Purkinje system was ab-normal.
Electrocardiographic Manifestations in Patients with COVID-19: Daegu in South Korea
Han-Joon Bae,Hyun Jun Cho,Chan-Hee Lee,Myung Hwan Bae,Hyoung-Seob Park,Byung Chun Jung,Dong-Gu Shin,Yongkeun Cho,Jongmin Hwang,Seongwook Han,Kyu-Hwan Park,Se Yong Jang,Young Soo Lee 대한심장학회 2021 Korean Circulation Journal Vol.51 No.10
Background and Objectives: As the coronavirus disease 2019 (COVID-19) spreads worldwide, cardiac injury in patients infected with COVID-19 becomes a significant concern. Thus, this study investigates the impact of several electrocardiogram (ECG) parameters and disease severity in COVID-19 patients. Methods: Seven medical centers in Daegu admitted 822 patients with COVID-19 between February and April 2020. This study examined 267 patients among them who underwent an ECG test and evaluated their biochemical parameters like C-reactive protein (CRP), log N-terminal pro-B-type Natriuretic Peptide (NT-proBNP), cardiac enzyme, and ECG parameters (heart rate, PR interval, QRS interval, T inversion, QT interval, and Tpe [the interval between peak to end in a T wave]). Results: Those patients were divided into 3 groups of mild (100 patients), moderate (89 patients), and severe (78 patients) according to clinical severity score. The level of CRP, log NT-proBNP, and creatinine kinase-myocardial band were significantly increased in severe patients. Meanwhile, severe patients exhibited prolonged QT intervals (QTc) and Tpe (Tpe-c) compared to mild or moderate patients. Moreover, deceased patients (58; 21.7%) showed increased dispersion of QTc and Tpe-c compared with surviving patients (78.2±41.1 vs. 40.8±24.6 ms and 60.2±37.3 vs. 40.8±24.5 ms, both p<0.05, respectively). The QTc dispersion of more than 56.1 ms could predict the mortality in multivariate analysis (odd ratio, 11.55; 95% confidence interval, 3.746–42.306). Conclusions: COVID-19 infections could involve cardiac injuries, especially cardiac repolarization abnormalities. A prolonged QTc dispersion could be an independent predictable factor of mortality.
Han Joon Bae,Yun-Kyeong Cho,Hyoung-Seob Park,Hyuck-Jun Yoon,Hyungseop Kim,Seongwook Han,Seung-Ho Hur,Yoon-Nyun Kim,Kwon-Bae Kim,Jae-Kean Ryu,Deug Young Nah,Chang-Wook Nam 대한내과학회 2020 The Korean Journal of Internal Medicine Vol.35 No.2
Background/Aims: To date, prospective data are limited on efficacy and safety profiles of statin therapy in Korean hypercholesterolemic patients. Hence, the aim of this study was to evaluate the practice patterns of statin therapy and its efficacy and safety through the prospective Daegu and Gyeongbuk statin registry. Methods: Statin naïve patients who were prescribed statins according to the criteria of Korean Guidelines for Management of Dyslipidemia were enrolled. Clinical and laboratory evaluations were performed at baseline and at week 8, where the efficacy was assessed with the same guidelines. Results: Of 908 patients, atorvastatin and rosuvastatin were most frequently prescribed statins (63.1% and 29.3%, respectively). High intensity statins (atorvastatin 40 mg or rosuvastatin 20 mg) were prescribed in 24.7% of all patients and in 79.5% of high and very high risk groups. The total and low density lipoprotein (LDL) cholesterol levels decreased from 203.7 ± 43.0 to 140.6 ± 28.6 mg/dL and 134.4 ± 35.7 to 79.5 ± 21.3 mg/dL, respectively. The achievement rate of the LDL target goal was 98.6% in low risk, 95.0% in moderate risk, 88.1% in high risk, and 42.1% in very high risk patients (59.7% in overall). There was no significant difference in the efficacy between atorvastatin and rosuvastatin. Adverse events were observed in 12.0% of patients and led to 1.4% of treatment cessation. Conclusions: The efficacy of the usual starting dose of statins in daily practice was relatively insufficient for Korean hypercholesterolemic patients with high or very high risks. Short-term adverse events of statin therapy were not common in Korean patients with a low discontinuation rate.
스플라인의 중공부 깊이가 프로펠러샤프트의 처짐에 미치는 영향
한동섭(Dongseop Han),김용(Yong Kim),이성욱(Seongwook Lee),한근조(Geunjo Han) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A propeller shaft is the device which is used to transmit the power between two shafts in a vehicles, an industrial machinery, etc. The end of spline is worm due to the deflection of the propeller shaft, and a lifetime of it is reduced, because it for industrial machinery has the length of 2,500 ㎜, the weight of 300 ㎏f, and the sliding distance of ±250 ㎜, Accordingly in this study we analyzed the effect of the hole depth of spline on the deflection of a propeller shaft carrying out the finite element analysis, in order to determine the proper hole depth of spline to minimize the deflection of it. We adopt 5-kinds of hole depth of spline from 50 ㎜ to 250 ㎜ at interval of 50 ㎜ as the design parameter for the finite element analysis and the centrifugal force as the load condition.
Choi, Ki Hong,Han, Seongwook,Lee, Ga Yeon,Choi, Jin-Oh,Jeon, Eun-Seok,Lee, Hae-Young,Lee, Sang Eun,Kim, Jae-Joong,Chae, Shung Chull,Baek, Sang Hong,Kang, Seok-Min,Choi, Dong-Ju,Yoo, Byung-Su,Kim, Kye The Korean Society of Cardiology 2018 Korean Circulation Journal Vol.48 No.11
<P><B>Background and Objectives</B></P><P>The prognostic impact of left axis deviation (LAD) on clinical outcomes in acute heart failure syndrome (AHFS) with left bundle branch block (LBBB) is unknown. The aim of this study was to determine the prognostic significance of axis deviation in acute heart failure patients with LBBB.</P><P><B>Methods</B></P><P>Between March 2011 and February 2014, 292 consecutive AHFS patients with LBBB were recruited from 10 tertiary university hospitals. They were divided into groups with no LAD (n=189) or with LAD (n=103) groups according to QRS axis <−30 degree. The primary outcome was all-cause mortality.</P><P><B>Results</B></P><P>The median follow-up duration was 24 months. On multivariate analysis, the rate of all-cause death did not significantly differ between the normal axis and LAD groups (39.7% vs. 46.6%, adjusted hazard ratio, 1.01; 95% confidence interval, 0.66, 1.53; p=0.97). However, on the multiple linear regression analysis to evaluate the predictors of the left ventricular ejection fraction (LVEF), presence of LAD significantly predicted a worse LVEF (adjusted beta, −3.25; 95% confidence interval, −5.82, −0.67; p=0.01). Right ventricle (RV) dilatation was defined as at least 2 of 3 electrocardiographic criteria (late R in lead aVR, low voltages in limb leads, and R/S ratio <1 in lead V<SUB>5</SUB>) and was more frequent in the LAD group than in the normal axis group (p<0.001).</P><P><B>Conclusions</B></P><P>Among the AHFS with LBBB patients, LAD did not predict mortality, but it could be used as a significant predictor of worse LVEF and RV dilatation (Trial registry at KorAHF registry, ClinicalTrial.gov, NCT01389843).</P>