• Journal of Chest Surgery
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• v.31 no.2
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• pp.216-219
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• 1998

Ebstein's anomaly is a complex malformation that can be treated by various surgical techniques, either repair or replacement of the abnormal tricuspid valve, with variable results. The essence of the malformation is the downward displacement of the septal and posterior leaflets into the ventricle, resulting in the formation of an atrialized portion of the right ventricle. The aim of surgical repair is to correct the tricuspid valve dysfunction and to plicate the atrialized portion of the right ventricle A 12-months old female was admitted with the diagnosis of Carpentier type A of Ebstein's anomaly with severe tricuspid regurgitation. She successfully underwent operation with vertical plication of right ventricle and reimplantation of tricuspid leaflets. Postoperatively cardiac size was significantly reduced and tricuspid regurgitation was trivial in echocardiography. She was diacharged the 14th postoperative day.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.20 no.8
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• pp.1587-1595
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• 2016

P wave is cardiac parameters that represent the electrical and physiological characteristics, it is very important to diagnose atrial arrhythmia. However, It is very difficult to detect because of the small size compared to R wave and the various morphology. Several methods for detecting P wave has been proposed, such as frequency analysis and non-linear approach. However, in the case of conduction abnormality such as AV block or atrial arrhythmia, detection accuracy is at the lower level. We propose P wave detection algorithm through adaptive threshold and QRS peak variability. For this purpose, we detected Q, R, S wave from noise-free ECG signal through the preprocessing method. And then we classified three pattern of P wave by peak variability and detected adaptive window and threshold. The performance of P wave detection is evaluated by using 48 record of MIT-BIH arrhythmia database. The achieved scores indicate the average detection rate of 92.60%.

• Journal of Chest Surgery
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• v.32 no.1
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• pp.22-26
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• 1999

Background: Treatment of adult patent ductus arteriosus(PDA) has many difficulty such as pulmonary hypertension, arterial wall calcification, aneurysmal chage of ductus. We tried to evaluate the effect of surgical interruption of PDA on postopeative change of heart size. Material and Method : From 1987 to 1997 we experienced 30 cases of the ligation of patent ductus arteriosus in adult at the department of cardiovacular surgery in Masan Samsung General Hospital. Result: There were 9 males and 21 females and their ages ranged from 16 to 44 years, with a mean age of 26.1 years. 15 patients had pulmonary hypertension and 9 patients complained of dyspnea with a degree of functional NYHA class III. Operation method was double or triple ligation using Teflon felt. Postoperative complications were wound dehiscence in 3 patients and transient hoarseness in 1 patient. The mean preoperative cardiothoracic ratio was 54.7%, and mean postoperative cardiothoracic ratio was 51.9%. The change of cardiothoracic ratio was more typical in the cases who had congestive heart failure. Their mean preoperative cardiothoracic ratio was 64.8% and the mean postoperative cardiothoracic ratio was 58.5% there was no postoperative deaths. Conclusion: We canclude that the improvement in cardiothoracic ratio may result from surgical intervention of PDA.

• Journal of Chest Surgery
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• v.29 no.5
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• pp.510-516
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• 1996

Cardiopulmonary bypass cannulas are usually characterized by the French number. However this de- scription provides only the external diameter of the cannula, which gives no information about the press- ure-flow characteristics of the cannula itself. A standardized system to describe the pressure-flow characteristics of a given cannula has recently been proposed and has been termed the M-number It is reported that the pressure-flow characteristics of a particular cannula can be determined from a novo- gram or chart, if the experimentally derived M-number of the cannula is known. In this regard, we conducted an investigation to analyze correlation between experimentally and clinical y derived M-numbers using three different sizes of pediatric aortic cannulas in fifty cardiac patients on cardiopulmonary bypass. The clinical and experimental M-numbers showed a strong correlation. The clinical M-numbers were typically 0.)5 to 0.55 greater than the experimental M-numbers. The clinical M-numbers also showed an inverse relationship to the temperature change of the patient, most probably due to an increase in blood viscosity from hypothermia. This inverse clinical M-numbersltemperature re- lationship was more marked in higher M-number cannulas. The clinical data obtained in this study suggest that the experimentally derived M-numbers correlated strongly with the clinical performance of the cannula with the significant influence of the temperature.

• Proceedings of the ESK Conference
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• 1997.10a
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• pp.142-151
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• 1997

본 연구는 주부들의 주활동공간인 부엌가구와 공간의 설계에 있어사용하기 편리하며 가사활동에 따 른 피로를 경감시키고 요통과 같은 주부직업병을 예방할 수 있는 부엌가구와 공간의 개발에 그 목적을 두었다. 연구는 먼저 수도권의 32평형 규모의 아파트150가구를 대상으로 설문조사를 실시하였으며, 만 24시간동안의 실제 가사활동을 Video로 촬영하여 동작분석을 실시하였다. 그 결과 주부들은 수납의 용 이성과 공간의 크기, 작업대의 높이 등을 가장 많은 개선사항으로 지적하였으며, 절반이상의 주부들이 앉은 자세에서 작업이 이루어졌으면 좋겠다고 응답하였다. 또한 동작분석 결과 작업의 70%이상이 개수 대를 중심으로 조리대와 가열대 주변의 한정된 공간에서정적으로 선 자세에서이루어지는 것으로 파악 되었다. 이러한 선 자세에서의 작업에 따른 피로도를 감소시키기 위하여 입좌식 의자를 도입하였으며, 개수대를 씽크대의 'ㄱ'자 코너에 위치하여 주방활동시의 이동거리를 단축하고자 하였다. 피로도의 경감 을 측정하기 위하여 입좌식 의자를 도입한 개선된 씽크대와 기존의 입식씽크대에서 가사활동시 요구되는 주부들의 에너지 대사량을 비교하기 위하여 심장박동수와 산소호흡량을 측정하였다. 실험결과에 따르면 주방에 입좌식의자를 도입한 경우가 가사활동에 요구되는 에너지 소모량이 심장박동수와 산소호흡량의 기준에서 각각 평균적으로 30%와 57.5% 이상이 감소하는 것으로 파악되어 이러한 부엌가구의 도입으로 주부들의 가사활동에따른 피로도가 절반 가까이 감소될 수 있음을 니타내었다. 또한 부엌가구의 재배치 에따른 가사활동시 이동거리가 평균적으로5.5%이상이 감소하는 것으로 나타났다. 본 연구결과를 주방설 계에 적용할 경우 가사활동의 효율성과 편리성이 향샹됨은 물론 가사활동에따른 피로도를 경감 시키고 요통 등의 주부직업병을 예방할 수 있을 것으로 기대된다.1일 1회씩 4회 투여한 군에서도 암수에 상관없이 전 농도 군에서 염색체이상을 나타내지 않아 유전독성을 나타내지 않음을 관찰하였다. 특히 vitamin C와 E의 병용투여는 상승적으로 적용하여 간세포손상을 더욱 억제시킴을 알 수 있었다.mance and on TFP(Total Factor Productivity) growth which is a pure measure of firm performance. To utilize the advantage of panel data, FEM(Fixed Effect Model) and REM(Random Effect Model) were used. The empirical result shows that the entropy index as a measurement of inter-business relatedness is not significant but technological relatedness index is significant. OLS estimates on pooled data were considerably different from FEM or REM estimates on panel data. By introducing interaction effect among the three variables for business portfolio properties, we obtained three findings. First, only VI (Vertical integration) has a significant positive correlation with ROS. Second, when using TFP growth as an dependent variable, both TR(Technological Relatedness) and f[ are signif

• Journal of the Korean Society of Radiology
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• v.82 no.4
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• pp.1011-1017
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• 2021

Bone cement embolism often occurs during percutaneous vertebroplasty. Bone cement pulmonary arterial embolism generally requires no treatment because of the small size and asymptomatic manifestation. Intracardiac bone cement embolisms are rare but associated with a risk of severe complications. Intracardiac bone cement embolisms are mainly removed through open heart surgery. To the best of our knowledge, only three cases of intracardiac bone cement embolisms removed with interventions have been reported. Here, we report another case of successful transcatheter retrieval of a 6-cm-long cement embolism in the right atrium after percutaneous vertebroplasty. The embolus broke in half and migrated to the right pulmonary artery intraoperatively. Using two snares and a filter retrieval device, we advanced from opposite directions. Further, we gently grasped and pulled the fragments of the right pulmonary artery and aligned them in a linear fashion directly into the sheath for uneventful removal.

• Journal of the Korean Society of Radiology
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• v.81 no.2
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• pp.272-289
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• 2020

Current advances in CT techniques allow thorough evaluation of the beating heart. The strengths of cardiac CT relative to echocardiography and magnetic resonance imaging are its high availability in most institutions, rapid production of high-quality images, and outstanding delineation of the anatomy. For many normal variants and pathologic conditions, such as thrombi, masses, and congenital abnormalities of the left atrium, CT findings are sufficient to make a presumptive diagnosis. Assessments of the left atrium and left atrial appendage are particularly important for the management of atrial fibrillation, as various catheter-based procedures are aimed at the mechanical and electrical isolation of these structures. CT offers information crucial to a successful catheter-based procedure or surgery. Therefore, a comprehensive review of the geometry (shape, size, and relative position), along with various CT imaging features of pathologic states, should be provided in radiology reports to be of clinical value.

• Journal of Chest Surgery
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• v.39 no.8 s.265
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• pp.588-597
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• 2006

Background: The surgical repair of a tetralogy of Fallot (TOF) has been performed successfully with a favorable early and late outcome. However, the later development of pulmonary regurgitation and stenosis remains a problem. The development of pulmonary regurgitation and stenosis may be changed by the size of right ventricular outflow tract (RVOT) reconstruction at the initial total correction. Hence, it is necessary to investigate the ideal size of RVOT reconstruction. Material and Method: This prospective study was carried out to determine how a surgical strategy and the RVOT size affect the occurrence of pulmonary regurgitation and stenosis. From January 2002 to December 2004, 62 patients underwent the TOF total correction. The RVOT size (diameter of pulmonary valve annulus) of each case was measured after the RVOT reconstruction and converted to a Z value. A pre-scheduled follow up (at discharge, 6 months, 1 year, 2 years and 3 years) was carried out by echocardiography to evaluate the level of pulmonary regurgitation and stenosis. Result: The patients were divided to two groups (transannular group n=12, nontransannular group n=50) according to the method of a RVOT reconstruction. The Z value of RVOT=iameter of pulmonary valve annulus) (transannular group -1, $range\;-3.6{\sim}-0.8;$ nontransannular group -2.1, $range\;-5.2{\sim}-1.5)$ and the average pRV/LV after surgery ${(transannular group 0.44{\pm}0.09,\;nontransannular group\;0.42{\pm}0.09)}$ did not show any significant difference between two groups. The occurrence of pulmonary regurgitation above a moderate degree was more frequent in the transannular group (p<0.01). In nontransannular group, the development of pulmonary regurgitation more than moderate degree occurred to the patients with larger RVOT size (Z value>0, p<0.02) and the progressing pulmonary stenosis more than mild to moderate degree developed in the patients with smaller RVOT size (Z value<-1.5, p<0.05). A moderate degree of pulmonary stenosis developed for 4 nontransannular patients. Three underwent additional surgery and one underwent a balloon valvuloplasty. Their Z value of RVOT were -3.8, -3.8 -2.9, -1.8, respectively. Conclusion: When carring out a TOF total correction, transannular RVOT reconstruction group has significantly more pulmonary regurgitation. In the nontransannular RVOT reconstruction. the size of the RVOT should be maintained from Z value -1.5 to 0. If the Z value is less than -1.5, we should follow up carefully for the possibility of pulmonary stenosis.

• Journal of Chest Surgery
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• v.29 no.10
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• pp.1081-1089
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• 1996

Pulmonary atresia with intact ventricular septum has continued to have a high surgical mortality and morbidity. This mAy attribute to the non-uniformity of the anomaly. We reviewed a total of 34 infants with pulmonary atresla and intact ventricular septum managed in this hospital between 1987 and 1995. Mean age and body weight were 57.2 (range, 3-208) days and 4.1 (range, B.3∼6.8) kg. The preoperative Z-value of the diameter of the tricuspid valve was less than -2 in 85.2% of patients and less than -4 in 33. 3% . It is well correlated w th right ventricular cavity size (n=27. r10.68, p< 0.05). Coronary artery-right ventricular fistulas were identified in 3 patients, and right ventricular dependency was suspected in 1 Over All hospital mortality was 23.5%(8/34), although it decreased to 16.6%(4124) in 1990s. Subsequent procedures were performed in 6 patients between 3 days and 58 months after Initial palliation : one bidirectional cavopulmonary shunt and 1 Fontan operation after systemic-pulmonary shunt, 3 transannular patch + atrial septal defect closure and 1 additional systemic-pulmonary shunt after polmonary valvectomy or valvotomy. Changes of Z-values of the diameter of tricuspid valve have been followed up in 11 patients between 1 and 66 months postoperatively. Z-values were increased In 5 out of 8 transannular right ventriculAr outflow tract enlargement group and in 1 out of 3 pulmonary valvectomy or valvotomy group. Our data suggest that tailoring a treatment to right ventricular cavity size and coronary anom lies may improve the surgical outcome. A Z-value of the tricuspid valve diameter could be used.

• Clinical and Experimental Pediatrics
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• v.50 no.10
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• pp.970-975
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• 2007

Purpose : Accurate measurement of defect size is important in transcatheter closure of atrial septal defect (ASD). We performed this study to analyze the difference between the measured ASD size and balloon occlusive diameter (BOD) by transthoracic (TTE) or transesophageal echocardiography (TEE). Methods : We investigated 78 patients who underwent transcatheter closure of ASD. The defect size and the distance between the surrounding structures were measured by TTE and TEE. The BOD was measured by TEE during cardiac catheterization. Clinical characteristics and echocardiographic data were compared and analyzed. Results : The difference between BOD and diameter by TTE was $4.8{\pm}3.6mm$ on short axis view, $5.4{\pm}3.2mm$ on long axis view. The difference between BOD and diameter by TEE was $3.6{\pm}2.2mm$ on short axis view, $4.2{\pm}3.1mm$ on long axis view. The difference between BOD and the diameter of defects on TTE, TEE had statistically significant positive correlations with the age of the patients, distance between the, defect and posterior atrial septal wall, the distance between the defect and the mitral valve leaflet, and the diameter of defects and the length of the atrial septum on TTE (P<0.05). Conclusion : BOD of ASD can be estimated by the diameter on TTE and TEE. BOD is expected to measure larger, depending on the size of defects, the distance from surrounding structures and the location of defects on echocardiography. Our data offers important information on details of transcatheter ASD closure which can be helpful in predicting suitability and judging the procedural appropriateness during the procedure.