The 111In-granulocyte scan in prosthetic vascular graft XXXX : imaging technique and results.

@entity1 @entity281 @entity292 @entity439 @entity1410 @entity221
Fourteen @entity1 were examined between 3 weeks and 11 years after implantation of an aortobifemoral vascular graft with 111In labelled leukocytes isolated with discontinuous gradient centrifugation. The camera acquisition was performed with a three phase technique (acquisitions at 30 min, 4 h and 24 h p.i.). The presence and extent of a graft or perigraft @entity281 including complicating @entity292 could be correctly diagnosed in six of eight @entity1 with surgically proven @entity281 . Leukocyte uptake index was calculated as 1.77 +/- 0.4 (30 min p.i.) and 2.4 +/- 0.7 (24 h p.i.). All @entity281 could be diagnosed by 30 min p.i., @entity292 only could be seen 24 h p.i. In two of eight @entity1 , false positive results were observed. These @entity1 suffered from suspected perigraft @entity1410 and noninfected aortic graft @entity439 . Both had a negative 30 min scan and a slight uptake in the late scans comparable to bone marrow activity. Six @entity1 with @entity221 of unknown origin showed true negative scans. There were no false negative scans. We conclude that only the leukocyte scan can diagnose the presence and the extent, including @entity292 , of vascular graft @entity281 . The three phase technique is recommended to localize the blood pool in the 30 min scan and to diagnose complications 24 h p.i. In cases of a negative 30 min scan and positive 4 h and 24 h scans, false positive results should be suspected. All @entity281 have a leukocyte uptake index higher than 1.2.
