Per Rectal Portal Scintigraphy Using ^99mTechnetium Pertechnetate to Diagnose Portosystemic Shunts in Dogs and Cats

Abstract

Per rectal portal scintigraphy using 99"Technetium pertechnetate (99"T~04-) was used to diagnose portosystemic shunts (PSS) before surgical confirmation in seven dogs and two cats. Shunt fractions, representing the percent of portal blood that bypasses the liver, were determined by computer analysis of the scintigraphic images. Animals with portosystemic shunts had a mean preoperative shunt fraction of 84.02% (n = 9). The mean postoperative shunt fraction in four animals was 58.22%. The mean shunt fraction in ten control dogs was 5.00%. Per rectal portal scintigraphy is an innovative, easily performed, inexpensive method to diagnose congenital portosystemic shunts in dogs and cats. (Journal of Veterinary Internal Medicine 1991; 523-27)

Outcome of ameroid constrictor occlusion of single congenital extrahepatic portosystemic shunts in cats: 12 cases (1993–2000)

“…22 The shunt fraction was high in all cats (mean shunt fraction, 81.9%; range, 67 to 93%; reference range, < 15%). Sodium pertechnetate Tc 99m was administered per rectum, and the shunt fraction was calculated, as described.…”

Pulmonary Hypertension in Patients With Congenital Portosystemic Venous Shunt: A Previously Unrecognized Association

“…The portal/systemic shunt ratio was given as the counts obtained in the heart divided by the total counts obtained in the liver and heart (normal: Ͻ5%). 22 We serially evaluated the cardiovascular condition of the CPSVS patients by chest radiograph, electrocardiography, and echocardiography. The presence of PAH was speculated based on the following findings: the marked dilatation of the right ventricle and/or main pulmonary artery (PA) on chest radiograph; the characteristic findings suggesting right ventricular hypertrophy on electrocardiography; or the decompression of left ventricle or the increased estimated right ventricular systolic pressure on echocardiogram.…”

A New Dissection Technique for Approach to Right‐sided Intrahepatic Portosystemic Shunts: Anatomic Study and Use in Three Dogs

“…3,8,9,11,19 Diagnosis of portosystemic shunting can be confirmed by scintigraphy, ultrasonography, portography, magnetic resonance angiography, CT scan, or exploratory celiotomy. 3,16,[20][21][22][23][24][25] The presence of a shunt was confirmed with ultrasonography in all dogs; however, shunt location could not be accurately determined with ultrasound in 4 dogs. The reported sensitivity of ultrasound for the diagnosis of portosystemic shunts varies from 56 to 100%, and is probably related to operator experience, thoroughness of the examination, and size and sedation of the patient.…”