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Simplified assessment of arterial graft patency using indium-labelled-platelet scintigraphy
S T Zwas1, R Walden, R Elkanovitz
1Department of Nuclear Medicine, Chaim Sheba Medical Centre, Tel-Hashomer, Israel.
Insights
Indium-111 labelled platelets can predict arterial graft occlusion. High platelet thrombogenic activity on scintigraphy indicates a high risk of graft failure, enabling early intervention.
Area of Science:
- Vascular Surgery
- Nuclear Medicine
- Biomedical Engineering
Background:
- Arterial graft occlusion remains a significant complication in vascular surgery.
- Early detection of graft failure is crucial for successful patient outcomes.
- Non-invasive imaging techniques are needed to monitor graft patency.
Purpose of the Study:
- To evaluate the utility of indium-111 labelled platelets in predicting arterial graft occlusion.
- To define scintigraphic criteria for impending graft thrombosis.
- To assess the thrombogenic activity of different arterial graft materials.
Main Methods:
- 13 patients with 18 arterial grafts underwent scintigraphy using indium-111 labelled platelets.
- Platelet thrombogenic activity was graded visually from scintigraphic images.
- Graft occlusion was monitored post-operatively with a mean follow-up of 24 months.
Main Results:
- Dacron and polytetrafluoroethylene grafts exhibited high thrombogenic activity compared to autologous veins.
- Nine grafts showed radioactivity patterns indicative of impending thrombosis; eight subsequently occluded.
- Nine grafts with absent to moderate platelet activity did not occlude.
Conclusions:
- Scintigraphy with indium-111 labelled platelets is a valuable non-invasive method for predicting arterial graft occlusion.
- Early identification of high thrombogenic activity allows for timely corrective measures.
- This technique can improve the success rate of interventions in the post-operative period.
Abstract:
Arterial grafts were studied with indium-III-labelled platelets in 13 patients (18 graft limbs) in the early post-implication period. Platelet thrombogenic activity was graded into four grades by visual inspection of the images, and scintigraphic criteria of impending graft occlusion were defined. Dacron and polytetrafluoroethylene grafts had similar high thrombogenic activity in comparison with autologous veins. Nine graft studies showed patterns of radioactivity concentration that suggested threatening thrombosis and eight of these eventually occluded. In nine other studies absent to moderate radiolabelled platelet activity was observed and none occluded within a mean follow-up period of 24 months. Prediction of graft occlusion of scintigraphic evaluation using the present simple non-invasive technique is valuable since corrective measures may be instituted earlier and with greater success in the post-operative follow-up period.