• The Korean Journal of Pharmacology
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• v.4 no.1 s.5
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• pp.37-39
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• 1968

A method for presenting the heart rate of intact animals as a kymographic record is described. A transistorized impulse generator with a dry battery power supply is used to produce pulses. The pulses are integrated and make a pen motor drived. The ability of the instrument to follow a wide range of heart rate change is demonstrated. The instrument is especially usefull to observe an acute and transitory heart rate change. A method for changing the heart beat to sound and a method for counting the heart rate of intact animal and isolated preparations by employing post office counter were also described.

• Proceedings of the KOSOMBE Conference
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• v.1997 no.05
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• pp.402-405
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• 1997

The analysis of heart sounds is a noninvasive diagnostic method useful to diagnose heart valve function. In this paper we compared the ability of spectral analysis method for prosthetic heart valve sounds. Phonocardiograms of prosthetic heart valve were analyzed in order to derive frequency domain feature suitable for the classification of the valve state. The FFT-based methods did not provide sufficient frequency resolution to completely characterize the spectrum of prosthetic heart valve sounds. A high resolution parametric methods were shown to give superior frequency resolution. In parametric methods, all methods provide a 1st & 2nd & 3rd frequency component. But Shank method provided a most dominant frequency peak.

• Journal of Korean Academy of Nursing
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• v.37 no.1
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• pp.64-71
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• 2007

Purpose: The main purpose of this study was to develop a substantive theory on the life of patients with heart transplantation in the context of Korean society and culture. The question for the study was 'What is the life of patients like with a heart transplant?'. Method: A grounded theory method guided the data collection and analysis. Participants for this study were 12 adults who regularly visited a Cardiovascular ambulatorium in a medical center. The data was collected through an in-depth interview and analyses were performed simultaneously. Result: 'Developing a new life to live on borrowed time' was the core category in this study. It revealed two types of life, one is living in peace and another is thinking positive. Conclusion: This study provides a framework for the development of individualized nursing interventions to care for patients with Heart Transplantation. The findings may provide pointers for health professionals about ways to improve support for heart transplant recipients.

• International Journal of Internet, Broadcasting and Communication
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• v.9 no.4
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• pp.19-24
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• 2017

In this paper, we propose an automatic segmentation method of left and right heart in computed tomography angiography (CTA) using separating energy function. First, we smooth the images by applying anisotropic diffusion filter to remove noise. Then, the volume of interest (VOI) is detected by using k-means clustering. Finally, we extract the left and right heart with separating energy function which we proposed to split the heart. We tested our method in ten CT images and they were obtained from a different patient. For the evaluation of the computational performance of the proposed method, we measured the total processing time. The average of total processing time, from first step to third step, was $14.39{\pm}1.17s$. We expect for our method to be used in cardiac diagnosis for cardiologist.

• Proceedings of the KSME Conference
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• 2008.11a
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• pp.1679-1682
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• 2008

Pulsatile Extracorporeal Membrane Oxygenation(ECMO) can mitigate the heart load and raise the patient's blood perfusion. But If the ECMO pulsate the blood flow during the systolic period, It can burden to the patient's heart. To avoid the heart injury, we have to consider the relation between output of ECMO, hemodynamic states and heart movement. To raise the efficacy of the pulsatile ECMO, we investigated the coronary perfusion, cardiac muscle tension and hemodynamic states during the ECMO perfusion by using the mathematical model of human blood circulatory system and ECMO. The outflow data of the pulsatile ECMO(T-PLS, Bioheartkorea, Korea) was obtained in vitro experiments. According to the phase and pumping rate of the ECMO, the heart's load and coronary perfusion could be adjusted to the proper levels. The results of the human- ECMO lumped parameter model showed that the synchronizing operation of the pulsatile ECLS can be helpful at stabilizing the patient's hemodynamic states.

• Journal of Chest Surgery
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• v.26 no.11
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• pp.874-880
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• 1993

A personal computer, IBM compatible 386, was utilized to analyse total series of 1867 cases of cardiovascular operations including 1060 cases of open cardiac surgeries performed at the Cardiac Center of Paik Hospital from 1986 to 1992.All data were first assembled from the operation files and the operation records from the patient charts. Code numbers were placed to the diagnosis, the operations and the diseases.The analysis revealed the distributions of 1867 cases of operations;819 cases[77%] of the congenital heart diseases and 207 cases[20%] of the acquired heart diseases among 1060 open heart operations. The operative mortalities were 3.7% for the congenital heart diseases and 6.3% for the acquired heart diseases.The vascular operations showed the operative mortalities of 11.8% for the aortic surgery under extracorporeal circulation and 0.7% for the other vascular surgery.

• Journal of Chest Surgery
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• v.22 no.6
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• pp.996-1000
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• 1989

Open heart surgery begun at 1959 in Korea. From that time to 1979, the surgery was performed below 100 cases in a year. However,that was performed above, 1,000 cases in a year from 1981. During the recent three years, i.e., 1985, 1986, and 1987, the annual operative cases were 3614,4503, and 4906, and then the mortality rates were progressively decreased to 6.2%, 5.3 %, and 5.0 %. In these time, overall mortality rate above 1 year old was 5.0 % versus that below 1 year old 17.9 9o in congenital heart diseases. These results are statistically different between two groups. Of the valvular heart disease cases, which occupied 97 % of total acquired heart disease, individual incidence was in mitral 68 %, and aortic 28%. The operative method was mainly valve replacement. Operative mortality for valve surgery in total was 4.4 %. Until 1985, bioprosthetic valve was frequently implanted but mechanical valve has been done more frequently in these days. Coronary artery bypass graft was large portion [67 * 75 %] of open heart surgery in western, but was below 1 % in Korea. However our diet patterns have been changed. Therefore we think the incidence of coronary artery disease will be increased. So we will be familiar to this field.

• Journal of Chest Surgery
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• v.16 no.2
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• pp.147-156
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• 1983

Over a period from May, 1977 to SEptember, 1982, 101 cases ofopen heart surgerywere done under cardiopulmonary bypass. There were 50 male and 51 female patients, and the ages of the patients ranged from 19 months to 48 years. Sixty-nine cases were congenital heart disease and 32 cases were acquired heart disease, which consisted of 30 valvular disease, 1 IVC obstruction, and 1 myxoma. Among the 30 cases of valvular disease, 12 MVR, 4 MVR+TAP, 2 MVT+AVR, 1 MAP, and 11 OMC were done. There were 3 operative deaths (17.5%) in 16 MVR, 1 in 2 MVR+AVR, and 1 in 11 OMC. Operative mortality in 69 congenital heart disease was 13.0% ; 3 deaths (6.7%) in 45 acyanotic and 6(25.0%) in 24 cyanotic cases. The overall mortality for 101 cases was 14.8%; 13.0% for congenital and 18.8% for acquired heart disease.

• Journal of Chest Surgery
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• v.24 no.10
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• pp.967-972
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• 1991

Between Feb. 1982 and July 1990, 173 patients [male: 89, female: 84] Who underwent heart valve replacement for acquired valvular heart disease on the Department of Thoracic and Cardiovascular Surgery, School of Medicine, Pusan National University, were reviewed for return to work after heart valve replacement. The replaced valve were mitral [128, 74.0%], aortic[10, 5.8%], mitral & aortic[35, 20.2%]. Two tricuspid valve replacement were excluded. Several important factors influencing the return to work were age, the employment status before surgery, the number of replaced valve, the pre - op NYHA functional class and cardiac function [ejection fraction]. These factors were closely related to the optimal time of heart valve replacement. It can be concluded that the rate of return to work and the quality of life would be improved if valve replacement were performed at an earlier stage of valvular heart disease.

• Journal of Chest Surgery
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• v.21 no.1
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• pp.48-54
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• 1988

168 cases of open heart surgery had been performed in Korea Veterans Hospital from Aug. 1984 to Nov. 1987. There were 150 cases of congenital heart disease and 18 cases of acquired heart disease. In congenital heart cases, 123 cases [82%] were acyanotic and 27 cases [18%] were cyanotic. Common congenital defects were VSD, TOF, ASD, PS in order of frequency. There were 11 cases of operative mortality; 5 cases [4%] in acyanotic group, 6 cases [22\ulcorner6] in cyanotic group. There was no mortality in valvular heart disease group. Overall mortality rate was 6.5%.