Aim: The aim of the study was to describe Doppler ultrasonography and computed tomography findings that should be considered in diagnosis treatment congenital portosystemic shunts.Methods: Archive retrospectively scanned. In consideration shunts: communication type aneurysm were defined. Additional imaging modalities utilized.Results: 11 patients included study. ages ranged from 0 158 months. T...

Congenital portosystemic shunts are present in one in 30,000 children. Among the associated risks of severe complications are neonatal cholestasis, benign and malignant liver tumors, hepatopulmonary syndrome, portopulmonary hypertension, and encephalopathy. They can be detected on prenatal ultrasonograms, during the investigation of a positive galactosemia screening test in neonates or of a com...

A 2-D numerical circuit model is used to analyze the impact of shunts on basic performance parameters of a CdTe thin-film module. A numerical estimate of module-efficiency loss in the worst-case scenario due to shunts of different severity and fractional module area is presented. It is shown that absolute module-efficiency loss ∆η (%) varies in systematic fashion with these shunt parameters. Es...

M OTZ. AND HIS COLLEAGUES ADDRESS AN OLD, but still important problem, namely spontaneous occlusion of systemic-topulmonary arterial shunts. With the current emphasis on neonatal repair, as opposed to staging operations, the focus of this discussion has shifted from tetralogy of Fallot and its related lesions to hypoplastic left heart syndrome. Patients undergoing the Norwood operation now comp...

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...

Piezoelectric tube scanners are the actuators of choice in scanning probe microscopy. These nanopositioners exhibit a dominant first resonant mode that is excited due to harmonics of the input scan signal. This introduces errors in the scan obtained. The presence of this resonant mode limits the upper bound of a triangular scan rate to around 1/100th of the first mechanical resonance frequency....

OBJECTIVES The results of percutaneous balloon angioplasty for obstructed modified Blalock-Taussig (BT) or central shunts and pulmonary artery (PA) stenoses were studied to assess its role as an alternative to second shunt and surgical PA angioplasty. BACKGROUND Obstruction of a modified shunt and PA stenosis related to the shunt or ductus are not infrequent. A second shunt with or without PA...