Quantitation of Left-to-right Cardiac Shunts with Radionuclide Angiography
نویسندگان
چکیده
منابع مشابه
Quantitation of left-to-right cardiac shunts with radionuclide angiography.
A quantitative radionuclide angiogram technique using an intravenous injection of technetium99m (Tc-99m) pertechnetate is described for quantitation of left-to-right shunts in the central circulation. Data analysis assumes exponential indicator clearance from normal cardiac chambers by dilution. A late prolongation of tracer disappearance compared to the initial clearance rate indicates an abno...
متن کاملRadionuclide quantitation of right-to-left intracardiac shunts in children.
A simple, noninvasive method for measurement of right-to-left intracardiac shunts would enhance the management of patients with congenital heart disease. This study describes application of data processing techniques used previously in dye-indicator curves to data recorded during the initial transit of radioactive bolus through the central circulation. Radionuclide angiocardiograms were perform...
متن کاملRe: deconvolutional analysis in radionuclide quantitation of left-to-right cardiac shunts.
A poor bolus injection results in an unsatisfactory quantitative radionuclide angiocardiogram in as many as 20% of children with possible, left-to-right (L-R) cardiac shunts. Deconvolution analysis was applied to similar studies in experimental animals to determine whether dependence on the input bolus could be minimized. Repeated good-bolus, prolonged (greater than 2.5 sec), or multiple-peak i...
متن کاملLeft-to-Right Shunts
Contrary to the opinion of French pediatrician HenriLouis that isolated ventricular septal defects (VSDs) are universally well tolerated, the subsequent discoveries of Eisenmenger, Abbott, Wood, and others have taught us that the prognosis of left-to-right shunt lesions is not always benign. After more than a century of research, as pediatric cardiologists and congenital heart surgeons, we clai...
متن کاملRadionuclide angiocardiography. Improved diagnosis and quantitation of left-to-right shunts using area ratio techniques in children.
A comparison of several reported methods for detection and quantitation of left-to-right shunts by radionuclides was performed in 50 children. Count ratio (C2/C1) techniques were compared with the exponential extrapolation and gamma function area ratio techniques. C2/C1 ratios accurately detected shunts and could reliably separate shunts from normals, but there was a high rate of false positive...
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ژورنال
عنوان ژورنال: Circulation
سال: 1974
ISSN: 0009-7322,1524-4539
DOI: 10.1161/01.cir.49.3.512