title: Quantitative radionuclide angiocardiography: detection and quantitation of left to right shunts.
abstract: In 105 patients defection and quantitation of left to right shunts was performed using quantitative radionuclide angiocardiography. The radionuclide angiocardiograms were acquired and analyzed by a gamma camera interfaced to a digital computer system. Pulmonary to systemic flow (Qp/As) ratios were calculated by analysis of pulmonary time-activity histograms using a gamma variate model. All patients were studied with cardiac catheterization, left ventricular angiocardiography and radionuclide angiocardiography. The radionuclide method allowed precise detection and quantitation of left to right shunts with a Qp/Qs ratio of 1.2 to 3.0. There was good agreement between the Ap/As ratio calculated by oximetry at cardiac catheterization and radionuclide angiocardiography (r = 0.94). The information gathered with this nontraumatic method appears sufficiently reliable to be used in the management of patients.
mesh_terms: D000328:Adult; D000790:Angiocardiography / Q000379:methods*; D001018:Aortic Diseases / Q000000981:diagnostic imaging; D006328:Cardiac Catheterization; D002675:Child, Preschool; D003201:Computers; D003936:Diagnosis, Computer-Assisted; D006330:Heart Defects, Congenital / Q000000981:diagnostic imaging / Q000601:surgery; D006349:Heart Valve Diseases / Q000000981:diagnostic imaging; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D011182:Postoperative Care; D013667:Technetium
chemical_list: D013667:Technetium