Fluorescence Video Angiography for Evaluation of Dynamic Perfusion Status in an Aneurysm Preclinical Experimental...

Experimental studies to assess aneurysm occlusion or perfusion typically rely on macroscopic examination or histological analysis but cannot assess dynamic perfusion.

To describe an easy-to-implement and inexpensive fluorescence angiographic technique for the in vivo assessment and imaging of the dynamic perfusion status of aneurysms and their underlying blood vessels in a rat model.

In a rat sidewall aneurysm model, the angiographic setup included 2 bandpass filters, a video camera, and a bicycle spotlight. After 48 rats underwent fluorescein angiography, dissections were performed to confirm the perfusion status by macroscopic and histologic examination of the aneurysm.

Direct injection of 0.2 mL fluorescein 10% Faure achieved strong, clear visibility in all 48 aneurysms. Macro-/microscopic examination identified residual perfusion in 25 and complete healing in 23 aneurysms. Fluorescein imaging identified 21 of these 25 aneurysms (84%) with residual perfusion and 22 of 23 aneurysms (96%) with no residual perfusion.

Our fluorescein imaging technique proved efficient for the evaluation of aneurysm patency and parent artery integrity in this experimental setting. Fluorescein is nontoxic, can be re-administered if needed, and, in this technique, can expand the armamentarium for the preclinical evaluation of dynamic perfusion status.