Transposition of the Great Vessels Manifested on Radionuclide Ventriculography

Cardiac catheterization 402 Cardiac markers of myocardial necrosis 406 Cardiac volumetric imaging: magnetic resonance & computed tomography 408 Echocardiography 416 Electrocardiogram 438 Electrocardiographic monitoring 446 Exercise testing 450 Myocardial perfusion imaging 454 Radionuclide ventriculography 458 Swan–Ganz catheterization 460 Tilt table testing 461 Cardiac catheterization is an invasive procedure during which catheters are placed within the cardiac chambers, coronary arteries and great vessels to provide information on cardiac anatomy, pressures, disease states, function, and oxygen saturations....

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Effects of Rest and Exercise on Cardiac Blood Volume Determinations

Nuklearmedizin ◽

10.1055/s-0038-1629844 ◽

1997 ◽

Vol 36 (08) ◽

pp. 259-264

Author(s):

N. Topuzović

Keyword(s):

Radionuclide Ventriculography ◽

Left Ventricular ◽

Peak Exercise ◽

Volume Determination ◽

Group I ◽

Lv Volumes ◽

Group Ii ◽

Lv Volume

Summary Aim: The purpose of this study was to investigate the changes in blood activity during rest, exercise and recovery, and to assess its influence on left ventricular (LV) volume determination using the count-based method requiring blood sampling. Methods: Forty-four patients underwent rest-stress radionuclide ventriculography; Tc-99m-human serum albumin was used in 13 patients (Group I), red blood cells was labeled using Tc-99m in 17 patients (Group II) in vivo, and in 14 patients (Group III) by modified in vivo/in vitro method. LV volumes were determined by a count-based method using corrected count rate in blood samples obtained during rest, peak exercise and after recovery. Results: In group I at stress, the blood activity decreased by 12.6 ± 5.4%, p <0.05, as compared to the rest level, and increased by 25.1 ± 6.4%, p <0.001, and 12.8 ± 4.5%, p <0.05, above the resting level in group II and III, respectively. This had profound effects on LV volume determinations if only one rest blood aliquot was used: during exercise, the LV volumes significantly decreased by 22.1 ± 9.6%, p <0.05, in group I, whereas in groups II and III it was significantly overestimated by 32.1 ± 10.3%, p <0.001, and 10.7 ± 6.4%, p <0.05, respectively. The changes in blood activity between stress and recovery were not significantly different for any of the groups. Conclusion: The use of only a single blood sample as volume aliquot at rest in rest-stress studies leads to erroneous estimation of cardiac volumes due to significant changes in blood radioactivity during exercise and recovery.

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An Epicardial Mesothelial Cyst Attached to the Ascending Aorta

The Heart Surgery Forum ◽

10.1532/hsf.1293 ◽

2015 ◽

Vol 18 (5) ◽

pp. 194

Author(s):

Yoshihito Suenaga ◽

Tomonobu Abe ◽

Masato Mutsuga ◽

Yoshimori Araki ◽

Akihiko Usu

Keyword(s):

Coronary Artery ◽

Coronary Artery Bypass Surgery ◽

Bypass Surgery ◽

Artery Bypass ◽

Mesothelial Cell ◽

Rare Condition ◽

Ascending Aorta ◽

Mesothelial Cyst ◽

Great Vessels ◽

Insight Into

An epicardial mesothelial cyst, which can be defined as a mesothelial cyst attached to the epicardium surrounding the heart and the great vessels inside the pericardial sac, is a rare condition. We herein report a case of epicardial cyst, which was attached to the ascending aorta. The patient was a 76-year-old male who underwent coronary artery bypass surgery, and the cyst was found incidentally. It was approximately 5 cm in diameter, and histological examination confirmed mesothelial cell origin. The ascending aorta has not previously been reported as the origin of an epicardial mesothelial cyst. This case gives new insight into the embryology of these cysts

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New Hybrid Method for Left Ventricular Ejection Fraction Assessment from Radionuclide Ventriculography Images

Current Medical Imaging Formerly Current Medical Imaging Reviews ◽

10.2174/1573405616666201118122509 ◽

2020 ◽

Vol 16 ◽

Author(s):

Halima Dziri ◽

Mohamed Ali Cherni ◽

Dorra Ben Sellem

Keyword(s):

Left Ventricular Ejection Fraction ◽

Left Ventricle ◽

Ejection Fraction ◽

Positive Predictive Value ◽

Roc Curve ◽

Radionuclide Ventriculography ◽

Left Ventricular ◽

The Other ◽

Left Ventricular Ejection ◽

Ventricular Ejection Fraction

Background: In this paper, we propose a new efficient method of radionuclide ventriculography image segmentation to estimate the left ventricular ejection fraction. This parameter is an important prognostic factor for diagnosing abnormal cardiac function. Methods: The proposed method combines the Chan-Vese and the mathematical morphology algorithms. It was applied to diastolic and systolic images obtained from the Nuclear Medicine Department of Salah AZAIEZ Institute.In order to validate our proposed method, we compare the obtained results to those of two methods of the literature. The first one is based on mathematical morphology, while the second one uses the basic Chan-Vese algorithm. To evaluate the quality of segmentation, we compute accuracy, positive predictive value and area under the ROC curve. We also compare the left ventricle ejection fraction estimated by our method to that of the reference given by the software of the gamma-camera and validated by the expert, using Pearson’s correlation coefficient, ANOVA test and linear regression. Results and conclusion: Static results show that the proposed method is very efficient in the detection of the left ventricle. The accuracy was 98.60%, higher than that of the other two methods (95.52% and 98.50%). Likewise, the positive predictive value was the highest (86.40% vs. 83.63% 71.82%). The area under the ROC curve was also the most important (0.998% vs. 0.926% 0.919%). On the other hand, Pearson's correlation coefficient was the highest (99% vs. 98% 37%). The correlation was significantly positive (p<0.001).

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