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  • SAGE Publications  (6)
  • 1
    Online Resource
    Online Resource
    Modified Fontan Procedure with the Simultaneous Bidirectional Cavopulmonary Shunt
    SAGE Publications ; 1995
    In:  Asian Cardiovascular and Thoracic Annals Vol. 3, No. 1 ( 1995-03), p. 29-34
    Details
    In: Asian Cardiovascular and Thoracic Annals, SAGE Publications, Vol. 3, No. 1 ( 1995-03), p. 29-34
    Abstract: We reviewed our experience of 56 patients from 1989 to 1992 who underwent a modified Fontan procedure and a bidirectional cavopulmonary shunt simultaneously. There were 39 male and 17 female patients and their weight ranged from 6.54 to 29kg (mean weight 13.58 ± 3.96kg). Patient age ranged from 16 to 135 months (mean age 42.8 ± 3.7 months). Diagnoses included single ventricle in 29, tricuspid atresia in 11, double outlet of right ventricle in 10, hypoplastic left heart syndrome in 4, and pulmonary atresia with intact ventricular septum in 2 patients. The techniques of inferior vena cava to pulmonary artery (IVC-PA) connection were anastomosis of proximal superior vena cava (SVC) to pulmonary artery (PA) in 27 (group 1), direct atriopulmonary anastomosis with roof formation in 29 patients (group 2). There were significant differences in postoperative 1-hour right atrial (RA) pressure and period of chest tube drainage between group 1 and group 2. The early mortality was 12.5% (7/56), and 2 late deaths (4.1%) occurred with a mean follow-up period of 22.4 months. Risk factors for the late postoperative arrhythmia were immediate postoperative arrhythmia and prolonged pleuro-pericardial effusion. Direct connection of the remaining proximal SVC to PA with the bidirectional cavopulmonary shunt may have less pleuro-pericardial effusion and late arrhythmia than atriopulmonary anastomosis.
    Type of Medium: Online Resource
    ISSN: 0218-4923 , 1816-5370
    URL: Article
    DOI: 10.1177/021849239500300109
    Language: English
    Publisher: SAGE Publications
    Publication Date: 1995
    detail.hit.zdb_id: 2044527-1
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  • 2
    Online Resource
    Online Resource
    Ventricular Outflow Tract Reconstruction with Polystan Valved Conduit
    SAGE Publications ; 2001
    In:  Asian Cardiovascular and Thoracic Annals Vol. 9, No. 3 ( 2001-09), p. 187-191
    Details
    In: Asian Cardiovascular and Thoracic Annals, SAGE Publications, Vol. 9, No. 3 ( 2001-09), p. 187-191
    Abstract: Experience with Polystan valved conduits in children with congenital heart disease was reviewed. From May 1997 to October 2000, 52 Polystan valved conduits were used for reconstruction of the pulmonary ventricular outflow tract in 50 patients. The median age was 24 months (range, 7 days to 19 years), body weight was 11 kg (range, 2.8 to 52 kg), and conduit size at operation was 19 mm (range, 12 to 24 mm). Early mortality was 12% (6/50). Late mortality was 6% (3/50). The median follow-up of survivors was 25 months (range, 2 to 43 months). Three patients underwent conduit replacement; 2 received larger conduits in a second-stage operation for ventricular septal defect closure. There was no death at reoperation. Polystan valved conduits can be used for reconstruction of the pulmonary ventricular outflow tract in congenital heart disease, with no significant conduit-related problems.
    Type of Medium: Online Resource
    ISSN: 0218-4923 , 1816-5370
    URL: Article
    DOI: 10.1177/021849230100900306
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2001
    detail.hit.zdb_id: 2044527-1
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  • 3
    Online Resource
    Online Resource
    Clinical correlation of a new and practical magnetic resonance grading system for cervical foraminal stenosis assessment
    SAGE Publications ; 2015
    In:  Acta Radiologica Vol. 56, No. 6 ( 2015-06), p. 727-732
    Details
    In: Acta Radiologica, SAGE Publications, Vol. 56, No. 6 ( 2015-06), p. 727-732
    Abstract: No systematic and quantitative system for evaluation of cervical neural foraminal stenosis (CNFS) has been reported. Purpose To evaluate whether the new magnetic resonance (MR) grading system for CNFS correlates with clinical manifestations and to propose a modified grading system more useful for clinical practice. Material and Methods We examined 356 patients who underwent MR imaging (MRI) of the cervical spine. The presence and grade of cervical foraminal stenosis at the maximal narrowing point were assessed using the new grading system suggested by Kim et al. (Kim system) and a modification of this grading system (modified Kim system) based on T2 axial images. Grade 0: narrowest neural foramen  〉  extraforaminal root; Grade 1: ≤ extraforaminal root; Grade 2: 〈 50% of extraforaminal root. Modified Kim system: Grade 0: 〉 80%, Grade 1: 〈 80% but 〉 50%, Grade 2 as for the Kim system. Results were correlated with clinical manifestations and neurologic physical examination findings (positive neurologic manifestation [PNM]). Results Analysis of correlation coefficients (Rs) showed moderate correlation between grades and clinical manifestations using the Kim system (0.484–0.562) and moderate to high correlation between grades and PNMs using the modified Kim system (0.517–0.782). Conclusion The Kim system showed moderate correlation clinical findings, while the modified Kim system still showed moderate but slightly stronger correlation. In both systems, grade 0 could denote negative neurologic manifestations. Although a considerable number of grade 1 and 2 cases in both systems had PNM, fulfilling the criteria for grades 1 and 2 CNFS, it does not perfectly predict PNM.
    Type of Medium: Online Resource
    ISSN: 0284-1851 , 1600-0455
    URL: Article
    DOI: 10.1177/0284185114537929
    RVK:
    XA 10000
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2015
    detail.hit.zdb_id: 2024579-8
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  • 4
    Online Resource
    Online Resource
    Design optimization for overhead ventilation duct system for a train using computational fluid dynamics and design of experiment
    SAGE Publications ; 2017
    In:  Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering Vol. 231, No. 5 ( 2017-10), p. 914-929
    Details
    In: Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, SAGE Publications, Vol. 231, No. 5 ( 2017-10), p. 914-929
    Abstract: The overhead multiple outlets ventilation duct system of 18 m long is used to maintain the specified indoor thermal comfort environment for each railway passenger car. Therefore, the flow uniformity of the overhead ventilation duct system is very important for heating, ventilation, and air conditioning performance of a train. In this study, design optimization was conducted to increase the flow uniformity of the overhead ventilation duct system for a train by combining computational fluid dynamics and design of experiment methods. To perform the study, the flow uniformity of the base model was evaluated using numerical analysis whose reliability was verified. Design parameters of the overhead ventilation duct system were selected, and an effectiveness evaluation was performed for each design parameter by using 2 k factorial design. Based on the results of the effectiveness evaluation for the design parameters, optimum models having improved flow uniformity were designed using the response surface method. The performances of the optimum models were also evaluated by the same numerical analysis that was applied to the base model. The flow uniformity of the optimum models was improved by controlling the opening ratios of the perforated plates and guide vane shape. In addition, nonuniform flow components locally existing in the base model were suppressed.
    Type of Medium: Online Resource
    ISSN: 0954-4089 , 2041-3009
    URL: Article
    DOI: 10.1177/0954408916646403
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2017
    detail.hit.zdb_id: 2024897-0
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  • 5
    Online Resource
    Online Resource
    Pressure wave characteristics of a high-speed train in a tunnel according to the operating conditions
    SAGE Publications ; 2018
    In:  Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit Vol. 232, No. 3 ( 2018-03), p. 928-935
    Details
    In: Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, SAGE Publications, Vol. 232, No. 3 ( 2018-03), p. 928-935
    Abstract: The pressure waves of a high-speed train in a tunnel exhibit complicated variations in their characteristics because the waves propagate and reflect with superposition. Studies have been consistently carried out on the pressure waves of a single train since changes in the area of pressure is a key element that influences ride comfort. Recently, the frequency of the operation of coupled trains has increased in order to improve the efficiency of running a train. The cross-sectional area of a train entering a tunnel has a rate of change that greatly influences the pressure characteristics; therefore, a coupled train can have different pressure characteristics when compared to a single train. However, adequate research works have not been done to assess these characteristics. To this end, the pressure characteristics of a train according to the operating conditions are investigated in this study. A high-speed train operating in practice and a tunnel located in a service section were chosen for this study, and the pressure characteristics of a single train were assessed via numerical analysis and an experiment. The numerical analysis was carried out with high reliability by comparing and verifying each result. After the pressure wave characteristics caused by running a coupled train had been assessed by the established numerical analysis, an obvious pressure variation was confirmed to occur at the connecting point. In addition, the maximum pressure applied to a tunnel and a passenger car increased. Thus, the aerodynamic effect of a coupled train should be considered as an important parameter in the early design state of a new high-speed train.
    Type of Medium: Online Resource
    ISSN: 0954-4097 , 2041-3017
    URL: Article
    DOI: 10.1177/0954409717702015
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2018
    detail.hit.zdb_id: 2024901-9
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  • 6
    Online Resource
    Online Resource
    A Clinical Study of Isolated Aortic Valve Replacement: A Univariate Analysis of Risk Factors
    SAGE Publications ; 1993
    In:  Asian Cardiovascular and Thoracic Annals Vol. 1, No. 3 ( 1993-09), p. 137-142
    Details
    In: Asian Cardiovascular and Thoracic Annals, SAGE Publications, Vol. 1, No. 3 ( 1993-09), p. 137-142
    Abstract: Between 1979 and 1990, 190 patients underwent isolated aortic valve replacement at Seoul National University Hospital in Korea. There were 11 (5.8%) in-hospital deaths. Univariate analysis identified advanced age (p = 0.026), preoperative serum GOT or GPT greater than 40IU/1 (p 〈 0.001, p = 0.003), NYHA Class III or IV (p = 0.029), preoperative mean pulmonary arterial pressure greater than 19 mmHg (p = 0.019), reoperation for aortic valve replacement (p = 0.035), second or third open heart surgery (p 〈 0.001), and use of mechanical valve (p = 0.008) as variables associated with increased in-hospital risk. Follow-up documented survival rates of 98.1% and 96.4% and event-free survival rates of 95.7% and 81.6% at 3 and 7 postoperative years, respectively. NYHA Class III or IV (p = 0.009), preoperative serum total bilirubin level greater than 1.2 mg/dl (p = 0.009), reoperation for aortic valve replacement (p = 0.03), second or third open heart surgery (p = 0.002), and use of mechanical valve were associated with decreased late survival and event-free survival.
    Type of Medium: Online Resource
    ISSN: 0218-4923 , 1816-5370
    URL: Article
    DOI: 10.1177/021849239300100309
    Language: English
    Publisher: SAGE Publications
    Publication Date: 1993
    detail.hit.zdb_id: 2044527-1
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