A new method for quantification of aortic regurgitation during cardiac catheterization

1980 ◽  
Vol 239 (1) ◽  
pp. H121-H124 ◽  
Author(s):  
S. Mendelsohn ◽  
C. J. Carlson ◽  
E. Rapaport
Keyword(s):  
Aortic Regurgitation ◽  
Cardiac Catheterization ◽  
Mechanical Model ◽  
Aortic Insufficiency ◽  
New Method ◽  
Potential Utility ◽  
Regurgitant Volume ◽  
Radioisotope Method ◽  
Clinical Methods ◽  
Mathematical Derivation

Clinical methods of estimating aortic insufficiency are unsatisfactory. We developed a radioisotope method of quantitating aortic regurgitant volume. The method is easily performed, convenient, and can be carried out repetitively. The mathematical derivation of the method is presented and a mechanical model is used to verify assumptions. The potential utility and possible difficulties of applying the method clinically are discussed.

Effective Stripper-Holding on High Speed Precision Blanking of Electronic Machine Parts

2005 ◽  
Vol 6-8 ◽  
pp. 805-808
Author(s):  
F. Sekine
Keyword(s):  
Mechanical Model ◽  
High Speed ◽  
Thin Sheet ◽  
Dimensional Accuracy ◽  
New Method ◽  
Important Process ◽  
Sheet Metals ◽  
Progressive Dies ◽  
Machine Parts

The blanking of thin sheet metals using progressive dies is an important process on production of precision electronic machine parts. As a model of IC leadframe, an I-shaped and an Lshaped models were blanked and influences of blanking conditions on dimensional accuracy of blanked lead were examined. Furthermore, a mechanical model is proposed to explain the affect of the blanking conditions on product accuracy. In these days, more fine leads are required as electronic machines become more precise and accurate. It must be treated that leads are firmly held for blanking leadframes accurately. In this paper, an effective method of stripper holding leads strongly are discussed and a new method using newly designed stripper is proposed. Consequently the effect of it on lead accuracy is proved.

Extracardiac Unruptured Sinus of Valsalva Aneurysm Presenting with Aortic Incompetence

1998 ◽  
Vol 6 (2) ◽  
pp. 138-140
Author(s):  
Berent Discigil ◽  
Mehmet Boga ◽  
Ugur Gürcün ◽  
Cahide Soydas ◽  
Münevver Yüksel
Keyword(s):  
Aortic Regurgitation ◽  
Surgical Management ◽  
Cardiac Catheterization ◽  
Preoperative Evaluation ◽  
Rare Condition ◽  
Unruptured Aneurysm ◽  
High Fever ◽  
Sinus Of Valsalva ◽  
Sinus Of Valsalva Aneurysm ◽  
Aortic Incompetence

We report a case of extracardiac unruptured aneurysm of the noncoronary sinus of Valsalva presenting with massive aortic regurgitation and high fever. The preoperative evaluation, echocardiographic and cardiac catheterization findings, and surgical management of this rare condition are discussed.

scholarly journals Estimation of Regurgitant Volume and Orifice in Aortic Regurgitation Combining CW Doppler and Parameter Estimation in a Windkessel Like Model

1991 ◽  
Vol 12 (1) ◽  
pp. 3-12
Author(s):  
Bjørn A.J. Angelsen ◽  
S.A. Slørdahl ◽  
J.E. Solbakken ◽  
S.O. Samstad ◽  
D.T. Linker ◽  
...  
Keyword(s):  
Parameter Estimation ◽  
Aortic Regurgitation ◽  
Regurgitant Volume

scholarly journals SUBAORTIC MEMBRANE;

2017 ◽  
Vol 24 (12) ◽  
pp. 1801-1805
Author(s):  
Tariq Waqar ◽  
Yasir Khan ◽  
Muhammad Usman Riaz
Keyword(s):  
Aortic Valve ◽  
Aortic Regurgitation ◽  
Aortic Insufficiency ◽  
P Value ◽  
Pressure Gradients ◽  
Severe Aortic Regurgitation ◽  
Associated Lesions ◽  
Dacron Patch ◽  
Pace Maker ◽  
The Right

Objectives: In this study, we presented our results regarding outcomes ofsurgical correction of sub-aortic membrane. Study Design: Retrospective observational study.Period: June 2012 to June 2017. Setting: CPEIC Multan, Pakistan. Methods: 51 patientsoperated for resection of sub aortic membrane. The resection of sub aortic membrane wasdone through the aorta. Evaluation of the aortic valve done in all patients. The aortic valve waseither replaced or repaired in cases of severe aortic regurgitation. Associated lesions such asventricular septal defects (VSD’s) were repaired with a dacron patch through the right atriumwhile ASD’s were repaired with a pericardial patch. Post-operative echocardiography was donebefore discharge and post-op LVOT gradients and aortic insufficiency were recorded for allthe patients. Results: There were 36 males and 15 females whose mean ages were 16.29years. On post-op echocardiography there was no residual significant LVOT gradient in anypatient. Three (3) patients developed mild to moderate aortic regurgitation post operativelybut none of them warrant any surgical intervention. There was only 1 death in the series whichwas due to VSD patch dehiscence. None of the patients developed conduction problems postoperatively needing any permanent pace maker. Mean pre-op LVOT gradient was 94.7 mmHgwhile it reduced to 20.7 post operatively (p-value <0.001). Conclusion: We concluded thatearly resection of sub aortic membrane can be safely accomplished with good results andsignificant drop in the mean LVOT pressure gradients post operatively.

scholarly journals Splitting Physical Exergy by Its Feasible Working Ways

Processes ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 2091
Author(s):  
Dongbo Gao ◽  
Xiaoqi Peng ◽  
Yanpo Song ◽  
Ping Zhou
Keyword(s):  
Exergy Analysis ◽  
Thermal Power ◽  
Splitting Method ◽  
Computational Method ◽  
New Method ◽  
Inlet Temperature ◽  
Working Ability ◽  
The Real ◽  
Power Cycle ◽  
Mathematical Derivation

This paper analyzed the problems associated with physical exergy splitting, and based on this, presented a new splitting method. This new method splits the physical exergy into three parts according to the feasible working ways, i.e.,: the direct, indirect, and adaptive exergy. The computational method and the physical meaning of the three exergy parts were presented in detail in terms of graphic representation and mathematical derivation. Then, it was applied to the exergy analysis of a thermal power cycle. The results show that compared with the conventional method which splits the physical exergy into thermal and mechanical parts, the current exergy splitting method can better represent the change rule of the working ability of the real working stream in the cycle and the influence of some operation parameters, such as the turbine inlet temperature, on the real working ability. The study suggests that the new method can make the exergy analysis more helpful and guidable in its applications.

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