Six cases of congenital heart disease were operated on by means of cardiopulmonary bypass between December, 1975 and April, 1976. Two cases of ventricular septal defects (VSD), two cases of VSD, associated with ruptured aneurysm of sinus Valsalva, two cases of atrial septal defects (ASD) and one case of pulmonic stenosis with patent ductus arteriosus were operated. Sarns roller pumps and Bentley Temptrol oxygenators were used for extracorporeal circulation. Pump oxygenator was primed with Ringer's lactate solution, 5% dextrose in water, mannitol, and ACD blood. Flow rate ranged from 2.0 to $2.4L/M^2/min$. Bicarbonate was added to the oxygenator with estimated amount as 15 mEq/L/hr. Venous catheters were introduced into superior and inferior vena cava, and oxygenated blood was returned to the body through aortic cannula inserted into ascending aorta. Moderate hypothermia ($30^{\circ}C$) was induced by core cooling. Aorta was cross clamped for 15 minutes and released for 3 minutes, and repeated clamping when necessary. Atrial and ventricular septal efects were closed by direct sutures. Aneurysms of sinus Valsalva ruptured into the right ventricle were repaired through right ventriculotomy by d:rect closure with Dacron patch reinforcement. Cardiopulmonary bypass time varied from 66 to 209 minutes, and aorta cross clamping time ranged from 13 to 56 minutes. Postoperative bleeding was minimal except one case who needed for evacuation of substernal hematoma. Intra- and postoperative urinary output was satisfactory. Acid-base balance, partial pressure of $O_2$, electrolytes, and hematological changes during intra- and post-perfusion period remained at the acceptable ranges. No mortality was experienced.
Alterations in the serum magnesium level were studied in twenty patients who had open-heart surgery during the period from August 1974 to May 1975. The patients were chosen at random. The operative procedures included repair for congenital heart diseases in fifteen patients and cardiac valve replacement for acquired valvular heart diseases in five patients. The age ranged from 8 to 46 years, with an average of 19 years. None of the patients had a history of gross neuromuscular abnormalities. Cardiopulmonary bypass was carried out using a roller pump and a disposable oxygenator. The prime solution consisted of 2 units of ACD banked blood and approximately an equal volume of non-blood additives in adults, while a relatively smaller volume was added in children. The average flow rate was 2,733 ml per minute. Blood samples for magnesium and arterial blood pH were obtained the day after admission 25 minutes after initiation of the bypass and on the morning the day after operation. Preoperative data were then compared with those obtained during the bypass and postoperatively by a paired test. During the bypass, the serum magnesium level decreased significantly from $1.425{\pm}0.029$ to $1.210{\pm}0.063mEq.$ liter (p<0.001). Also, there was a significant decrease in serum magnesium from $1.425{\pm}0.029$ preoperatively to $1.255{\pm}0.083mEq$. per liter (p<0.001). Also, there was a significant decrease in serum magnesium from $1.425{\pm}0.029$ preoperatively to $1.255{\pm}0.083mEq$. per liter postoperatively (p<0.01). The duration of bypass was less than 90 minutes in 10 patients (group A) and exceeded 90 minutes in the remaining 10 (group B). There was no statistical correlation between the groups A and B ($p{\gg}0.20$). Statistical analyses of the serum magnesium level and arterial blood pH showed no significant correlation with correlation coefficient; being -0.3485(pre-op), -0.2971(during bypass), and -0.1008(post-op), respectively. In all the patients, no gross neuromuscular abnormalities were found postoperatively. At present, the clinical significance of the serum magnesium level during and after bypass is controversial. In the near future, however, it is expected that improvements in prime solution and heart-lung machine will solve this problem.
Reappraisal measurements of apparent half survival time of red cell by $^{51}Cr$ method was made and effects of blood-letting over red cell survival were observed. The study was performed on 53 normal male subjects under three different experimental conditions. 1. Group 1 Mean $^{51}Cr$ red cell half survival by ACD wash method was 29.7 days. $T\frac{1}{2}$ of Ascorbic acid method was 29.0 days in group with 100 mg dose and 29.1 days in group with 50 mg dose respectively. There was no difference between these two methods in regards to red cell half survival. No difference were noted in amount of ascorbic acid administered. 2. Group 2 As daily amount of blood loss is increased the shortening of red cell half survival was noted. Rapid phase was seen when blood loss ranged 10 to 25 ml per day, while slow phase noted when more loss amounted 25 ml or more daily. Thus, it was clear that there was more than an exponential relation between $T\frac{1}{2}$ and the amount of blood loss. 3. Group 3 $T\frac{1}{2}$ measured by cpm per whole blood was within normal range and $T\frac{1}{2}$ measured by cpm per red cell mass showed shortening tendency when compared with the former in the group measured after blood loss (from 25 ml daily up to 100 ml daily in 10 days). In the group with rather constant blood loss of 100 ml daily for 10 consecutive days revealed the significant difference in two measurements (P<0.01). 4. $T\frac{1}{2}$ in non-steady state When red cell production is increased compared with red cell destruction, $T\frac{1}{2}$ measured by cpm per red cell mass being shorter than that by cpm per whole blood. Shortening of $T\frac{1}{2}$ measured by cpm per whole blood is more prominent. if red cell destrction is enhanced and exceeds production. 5. It is clear that when expressing red cell destruction rate, $T\frac{1}{2}$ measured by cpm per whole blood is more adequate and production more consistent with cpm red cell mass. 6. $T\frac{1}{2}$ measured during blood-letting, when corrected by amount of blood loss, it remains normal. It is erroneous to use conventional equational when measuring $T\frac{1}{2}$ in non-steady. $T\frac{1}{2}$ measured by cpm per whole blood is considred more applicable in clinical evaluation.
Recently, the overseas construction market has been actively promoted for about 10 years, and overseas dam construction has been continuously performed. For the economic and safe construction of the dam, it is important to prepare the main dam construction plan considering the design frequency of the diversion tunnel and the cofferdam. In this respect, the prediction of river level during the rainy season is significant. Since most of the overseas dam construction sites are located in areas with poor infrastructure, the most efficient and economic method to predict the water level in dam construction is to use the upstream water level. In this study, a linear regression model, which is one of the simplest statistical methods, was proposed and examined to predict the downstream level from the upstream level. The Pyeongchang River basin, which has the characteristics of the upper stream (mountain stream), was selected as the target site and the observed water level in Pyeongchang and Panwoon gaging station were used. A regression equation was developed using the water level data set from August 22th to 27th, 2017, and its applicability was tested using the water level data set from August 28th to September 1st, 2018. The dependent variable was selected as the "level difference between two stations," and the independent variable was selected as "the level of water level in Pyeongchang station two hours ago" and the "water level change rate in Pyeongchang station (m/hr)". In addition, the accuracy of the developed equation was checked by using the regression statistics of Root Mean Square Error (RMSE), Adjusted Coefficient of Determination (ACD), and Nach Sutcliffe efficiency Coefficient (NSEC). As a result, the statistical value of the linear regression model was very high, so the downstream water level prediction using the upstream water level was examined in a highly reliable way. In addition, the results of the application of the water level change rate (m/hr) to the regression equation show that although the increase of the statistical value is not large, it is effective to reduce the water level error in the rapid level rise section. Accordingly, this is a significant advantage in estimating the evacuation water level during main dam construction to secure safety in construction site.
Journal of the Korean Association of Oral and Maxillofacial Surgeons
/
제38권4호
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pp.231-239
/
2012
Objectives: This study sought to provide guidelines in order to decrease the incidence of nerve injury during mandibular ramus bone harvesting, and to improve understanding of the anatomical structure of the inferior alveolar canal (IAC) to include its distance from the exterior buccal cortex. Materials and Methods: In January and February 2009, 20 patients who visited the Wonkwang University Department of Oral and Maxillofacial Surgery reporting various conditions underwent cone beam computed tomography and were included in this study. Patients with missing left or right mandibular first molars or incisors, or who had jaw fracture or bone pathologies, were excluded. The reference point (R point) was defined as the point where the occlusal plane reached the anterior ramus of the mandible. The position of the IAC in relation to the R point, the buccal bone width (BW), the alveolar crest distance (ACD), the distance from the alveolar crest to the occlusal plane (COD), and the distance from the IAC to the sagittal plane (CS) were determined using proprietary image analysis software which produced cross-sectional coronal and axial images. Results: The distance medially from the R point to the IAC along the axial plane was $6.19{\pm}1.21mm$. The HD from the R point, posteriorly to IAC, in the lateral view was $13.07{\pm}2.45mm$, the VD from the R point was $14.24{\pm}2.41mm$, and the ND from the R point was $10.12{\pm}1.76mm$. The pathway of the IAC was positioned almost in a straight line along a sagittal plane within $0.56{\pm}0.70mm$. The distance from the buccal bone surface to the IAC increased anteriorly from the R point. Conclusion: Marking osteotomy lines in the retromolar area in procedures involving bone harvesting should be discouraged due to the risk of damage to IAC structures. Our measurements indicated that the area from the R point in the ramus of the mandible to 10 mm anterior can be safely harvested for bone grafting purposes.
본 연구는 호프 주산지인 강원도 횡성에서 호프 발육기 동안의 기상요소 변화에 따른 $\alpha$-acid 함량 예측모형을 작성하고, $\alpha$-acid 생성에 관여하는 기상요소를 구명하고자 1978년부터 1986년까지 9개년 간의 연평균 $\alpha$-acid 함량과 발육단계별 기상요소를 분석 검토한 결과는 다음과 같다. 1. $\alpha$-acid 함량 예측을 위하여 선택된 기상요소는 화아분화기(5월 21일~6월 20일)의 최고기온, 개화기(6월 11일~7월 10일)의 최고기온, 일조시수 그리고 강수량, 구화형성기(7월 21일~8월 20일) 최고기온이었다. 2. 개화기의 일조시수(X$_1$), 개화기의 최고기온(X$_3$), 개화분화기의 최고기온(X$_4$), 개화기의 강수량(X$_{5}$), 그리고 구화성숙기의 최고기온(X$_{6}$)의 $\alpha$-acid 함량 증가에 영향을 주었다. 3. $\alpha$-acid 함량 예측의 중선형 회귀모형은 Y=28.369-0.003 X$_1$+1.508 X$_2$-1.953X$_3$-0.335X$_4$-0.003X$_{5}$-0.119X$_{6}$로 MSEp=0.004, Rp$^2$=0.9987, Rap$^2$=0.9949, Cp=7.00이었다.
Purpose : The Purpose of this research was to investigate the effects of antithromb otic activities of Honghwadangguisan(HDS) Methods : Measured the effect which was given to blood flow rate through the regular volume of glass tube after the blood was diluted five times with ACD soulution. Antithrombotic effect was calculated as a percentage of the experimental animal figure protected from the paralysis of hind legs or death of the mouse that is caused from the administration of platelet aggregation regent. Each of the groups consisted in 8 mice, was divided into Normal, Control, and HBS. All of these 3 group were supplied a saline solution and after an hour the control group brought the dextran extravasated blood. Also the HDS group was dosed to the experimental mice with Oral Zonde one day before the experiment. After that, the mice were abstained from food. And then we gave a measured amount of it before an hour. Finally, it gave rise to dextran extravasated blood as well as the Control group. Results : The results were obtained as follows. In vitro, HDS inhibited platelet aggregation induced by ADP and epinephrine significantly as compared with the control group. HDS showed fibrinolytic activity insignificantly as compared with the control group. HDS reduced blood flow rate in significantly as compared with the control group. In vivo HDS inhibited pulmonary embolism induced by collagen and epinephrine (inhibitive rate 50%). HDS increased number of platelet, fibrinogen amount and shortened prothrombin time, activated partial thromboplastin time significantly but reduced blood flow rate insignificantly as compared with the control group in thrombus model induced by dextran. Conclusion : HDS is effective antithrombotic activity from experimental result.
Objectives: This study was performed to evaluate course of the inferior alveolar canal in the mandibular ramus and to find safety zone when ramal bone is harvested. Patients and Methods: From January, 2009 to February, 2009, the 20 patients who visited in the Department of Oral and Maxillofacial Surgery, Sanbon Dental Hospital. Wonkwang University and the Conebeam CT was taken of various chief complaints, were selected. The patients who had left and right mandibular first molar and incisor missing, jaw fracture and bone pathology were excluded. The R point was defined as the point which occlusal plane was crossed to the mandibular anterior ramus(external oblique ridge). In the cross-sectional coronal and axial views, the inferior alveolar canal position to the R point, buccal bone width(BW), alveolar crest distance(ACD), distance from alveolar crest to occlusal plane(COD) and inferior alveolar canal to sagittal plane(CS) were measured and horizontal distance(HD), vertical distance(VD) and nearest distance(ND) were measured. Results: The inferior alveolar canal is located $6.19{\pm}1.21\;mm$ from the R point. Horizontal distance from the R point were $13.07{\pm}2.45\;mm$, vertical distance from the R point were $14.24{\pm}2.41\;mm$ and nearest distance from the R point were $10.12{\pm}1.76\;mm$. The course of the inferior alveolar canal was positioned within $0.61{\pm}0.68\;mm$. The distance from external buccal bone to the inferior alveolar canal was increased from the R point anteriorly. Conclusions: It is considered that the mandibular ramus from the R point to 10 mm anteriorly can be harvested safely at ramal bone grafting.
Purpose : The Purpose of this research was to investigate the effects of antithrombotic activities of Wuslsan (WSS). Methods : Measure the effect which was given to blood flow rate through the regular volume of glass tube after the blood was diluted five times with ACD soulution. Antithrombotic effect was calculated as a percentage of the experimental animal figure protected from the paralysis of hind legs or death of the mouse that is caused from the administration of platelet aggregation regent. Being classified one group of eight mice, each of them was divided into Normal, Control, and WSS. The normal group supplied a saline solution and the control group brought the dextran extravasated blood after an hour of administering the saline solution. Also WSS was dissolved in 2ml saline solution and then we dosed it to the experimental mice with Oral Zonde one day before the experiment. After that, the mice were abstained from food. And then we gave a measured amount of it before an hour. Finally, it gave rise to dextran extravasated blood in the same way as the Control group. Results : The results were obtained as follows. WSS inhibited platelet aggregation induced by ADP and epinephrine significantly as compared with the control group. WSS showed fibrinolytic activity insignificantly as compared with the control group. WSS increased blood flow rate significantly as compared with the control group in vitro. WSS inhibited pulmonary embolism induced by collagen and Epinephrine(inhibitive rate is 37.5%). WSS increased number of platelet and fibrinogen amount significantly, and shortened PT and APTT as compared with the control group in thrombus model induced by dextran. Conclusion : WSS is effective antithrombotic activity from experimental result.
This study was performed to evaluate antithrombotic activities of Saegeumsan (瑞金散, SGS) which has effects of activating blood, removing thrombus. This study is designed to measure the effect which was given to blood flow rate through the regular volume of glass tube after the blood was diluted five times with ACD solution. Antithrombotic effect was calculated as a percentage of the experimental animal figure protected from the paralysis of hind legs or death of the mouse that is caused from the administration of platelet aggregation regent. We standardized the time when the experimental animals were incapable of functioning the hind legs more than 20 minutes or maintained trembling. Being classified one group of eight mice, each of them was divided into Normal, Control, and SGS. The normal group supplied a saline solution and the control group brought the dextran extravasated blood after an hour of administering the saline solution. Also, SGS was dissolved in $2m{\ell}$ saline solution and then we dosed it to the experimental mice with Oral Zonde one day before the experiment. After that, the mice were abstained from food. And then we gave a measured amount of it before an hour. Finally, it gave rise to dextran extravasated blood in the same way as the Control group. The results were obtained as follows, SGS significantly inhibited platelet aggregation induced by ADP and epinephrine when analyzed by the Sigmoid $E_{max}$ model in WinNonlin. $EC_{50}$ values of SGS were 4.61 mg/ml and 12.41 mg/ml for ADP and epinephrine respectively. SGS showed fibrinolytic activity insignificantly as compared with the control group. SGS increased blood flow rate significantly as compared with the control group in vitro. SGS inhibited pulmonary embolism induced by collagen and epinephrine(inhibitive rate is 37.5 %). SGS increased number of platelet and fibrinogen amount significantly, and shortened PT and APTT as compared with the control group in thrombus model induced by dextran. According to, SGS is effective antithrombotic activity from experimental result.
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