• Journal of Chest Surgery
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• v.33 no.2
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• pp.139-145
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• 2000

Background: The purpose of this study is to review the clinical course after the correction of noncomplicated ventricular septal defect and to analyze the morbidity and risk factors of postoperative complications and evaluate residual defect during the follow-up period. Material and Method: From September 1994 to June 1998 24 patients(median age 10 months) underwent surgery under the diagnosis of ventricular septal defect. We made a retrospective review of the clinical records including the operation notes critical care unit records echocardiography results and the follow-up records. Result: There was no early mortality nd late mortality. There was no postoperative complete conduction block. Respiratory complication was the most common complication. The body weight age type of ventricular septal defect associated anomalies and operative procedure were not related to the incidence of complications. residual ventricular septal defects aortic valve regurgitation and tricuspid valve regurgitation were insignificant in postoperative hemodynamics, Conclusions: Correction of the noncomplicated ventricular septal defect was done without mortality and complete heart block. Aggressive preoperative medical treatment and early surgical treatment may decrease postoperative complications. Postoperative residual shunt and tricuspid regurgitation were not problematic during the follow-up

• Journal of Chest Surgery
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• v.32 no.12
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• pp.1131-1134
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• 1999

After a penetrating thoracic injury early detection of intracardiac injury and early surgical repair when indicated are essential. A case presenting severe respiratory distress two weeks after a penetrating thoracic injury is reported. Transesophageal echocardiography showed massive pericardial effusion ventricular septal defect and mirtal regurgitation, The infundibular ventricular septal perforation was repaired using a Dacron patch the anterior mitral leaflet by interrupted sutures and the ruptured chordae of the posterior leaflet by a new chordae formation.

• Journal of Chest Surgery
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• v.26 no.12
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• pp.904-908
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• 1993

Twelve patients had undergone repair of atrioventricular septal defects. Age at operation ranged from 2.4 years to 17 years[mean, 8.25 years]. Five patients were male and seven were female. Three patients had complete atrioventricular septal defect[Rastelli type A] associated with Down`s syndrome. One of the three patient with complete atrioventricular septal defect had tetralogy of Fallot. Three patients had the intermediate form and seven patients had the partial form. The primum atrial septal defect was closed with pericardial patch. The atrioventricular valve septal commissure[mitral cleft] was closed with pledgeted sutures. Three complete atrioventricular septal defect were undergone by two-patch technique. A crescent-shaped Dacron patch was used to occlude the ventricular septal defect. One patient of partial form was sudden death 5 days postoperatively. There were no another complications after surgery. One patient underwent reoperation for opened mitral cleft 2.5 years postoperatively. New York Heart Association functional class of patients was improved postoperatively.

• Journal of Chest Surgery
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• v.22 no.6
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• pp.990-995
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• 1989

Since 1984, 24 patients underwent repair of atrioventricular septal defect. Nineteen had a partial defect and 5 had a complete atrioventricular septal defect. There were 9 men and 15 women, ranging in age from 1 to 50 years [mean age, 13.3 years]. Four patients had a Downs syndrome. Additional congenital heart defects were present in 11 patients. One patient had palliative operation prior to total correction. In partial defects, the primum atrial septal defect was closed with Xenomedica patch and the mitral valve was repaired with simple closure of the septal commissure. Central incompetence from annular dilatation was repaired by a local annuloplasty. In complete defect, the septal defects were closed with two patches except one. Operative mortality was 5% in partial defects and 60% in complete defects and low cardiac output was the commonest etiology. In a mean follow-up period of 27.9 months [range, 4 to 63 months] there were no late death and no instances of late-onset complete heart block. One patient required reoperation [MVR] for residual mitral regurgitation. The majority of patients were asymptomatic and mean postop. NYHA functional class was 1.2.

• Journal of Veterinary Clinics
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• v.35 no.6
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• pp.286-289
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• 2018

A 4-year-old castrated male Maltese was referred to our hospital with heart murmur. The client did not recognize any symptoms. Auscultation revealed systolic murmur located at the left heart base. Radiographs showed right-sided cardiomegaly with the main pulmonary artery bulging and enlargement of pulmonary vessels. Echocardiogram revealed a small ventricular septal defect and a large atrial septal defect. There was also a common atrioventricular valve. Based on diagnostic imaging studies, the dog was diagnosed with transitional atrioventricular septal defect.

• Proceedings of the KSME Conference
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• 2007.05b
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• pp.3512-3517
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• 2007

Nuclear power plant has many external fire hydrants that have to operate in the state of emergency such as facility fire, forest fire. The valve stem of one among them was broken 3 times for 4 years. It had long valve stem and operated under high water pressure. The elongation and the tensile strength for the broken valve stem was measured to examine the defect of material property. And the vibration level and the natural frequencies was detected to check the resonance. As the result of a diagnosis, the cause of this fault is proven buckling of long valve stem.

• Journal of Advanced Marine Engineering and Technology
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• v.29 no.5
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• pp.571-578
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• 2005

Stresses of main stop valve and control valve casings for the steam turbines of power plants are analyzed by the finite element method. The stress intensity is obtained to check the results on the basis of the design criteria of ASME boiler and pressure vessel code. To verify accuracy of the finite element analysis. analyzed stresses are compared with those measured during the hydrostatic pressure test. Stress category drawings. which play an important role in evaluating casting defects, are produced from the analysis results, and important points in casting of the valve casings are discussed in terms of the stress category.

• Journal of Chest Surgery
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• v.42 no.4
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• pp.509-512
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• 2009

Ebstein's anomaly is a complex congenital defect of the tricuspid valve and right ventricle. Various surgical methods to repair the regurgitant tricuspid valve have been reported, and most of them depend on monocuspidalization with using the anterior leaflet. We report here on our first experience with Ebstein's anomaly in a 31-year-old female patient who underwent cone reconstruction of the tricuspid valve with using three leaflets.

• Journal of the Korean Ceramic Society
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• v.35 no.2
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• pp.172-179
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• 1998

Valve lifter namely tappet is supported by lifter hole which is located upper side of camshaft in cylinder block transforms rotatic mvement of camshaft into linear movement and helps to open and shut the en-gine valve as an engine parts. The face of valve lifter which is continuously contacting with camshaft brings about abnormal wears such as unfair wear and early wear because it is severely loaded in the valve train system. These wears act as a defect like over-clearance and cause imperfect combustion of fuel during the valve lifting in the combustion chamber. Consequently this imperfect combustion makes the engine out-put decrease and has cause on air pollution. To prevent these wears therefore The valve lifter cast in me-tal developed into SiC ceramics valve lifter which has an excellence in wear and impact resistance As a results the optimum process conditions like injection condition mixture ratio and debonding process could be established. After sintering fine-sinered dual microstructure in which prior ${\alpha}$-SiC matches well with new SiC(${\beta}$-SiC) produced by reaction among the ${\alpha}$-SiC carbon and silicon was obtained. Based on the study it is verified that mechanical properties of SiC valve lifter are excellent in Vickers hardness 1100-1200 bending strength (300-350 Pa) fracture toughness(1.5-1.7 Mpa$.$m1/2) Through engine dynamo test-ing SiC valve lifter and metal valve lifter are examined and compared into abnormal phenomena such as early fracture unfair and early wear. It is hoped that this research will serve as an important springboard for the future study of heavy duty diesel engine parts developed by ceramics which has a good wear resis-tance relaibility and lightability.

• Journal of Chest Surgery
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• v.26 no.11
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• pp.821-826
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• 1993

Between January 1983 and December 1992, we had experienced 79 patients of ventricular septal defect [ VSD ] associated with aortic insufficiency [AI] which constitute 4.6 % of total numbers of VSD. The mean age of the patients was 10.2 years with a range of 1 to 35 years and the average degree of aortic insufficiency classified by Sellers was 2.1. The type of VSD was subpulmonic in 57 patients and perimembranous in 22. Most common pathologic finding causing AI was prolapse of right coronary cusp [ 54 cases ; 71.4% ] ,followed by prolapse of both right and non-coronary cusp[ 12 cases ; 7.9% ]. VSD closure alone was performed in 51 patients and their mean age was 7.7 years [ ranged 1 to 13 years ]. VSD closure and aortic valve reconstruction was performed in 22 patients, VSD closure and aortic valve replacement in 6 patients, and the mean age of the patients was 14.5 years [ ranged 2 to 28 years ], 20.4 years [ ranged 18 to 35 years ] respectively. There was no hospital mortality. All patients were followed up from 1 month to 9 year 4 months [average; 21.4 months ] and there was one late death. Our data suggests that, early closure of VSD without any manipulation on the valve may be sufficient procedure to improve or at least withhold progression of AI in children and furthermore patients with VSD associated AI should be corrected promptly after diagnosis.