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Results There were no partial or complete losses of transplants. Two flaps with an early arterial failure were successfully salvaged by revision surgery. The ICG-angiographies were tolerated well. The gain of fluorescence was delayed in the transplanted tissue when compared to the surrounding tissue, whereas the final maximum fluorescence intensities were comparable. The two flaps with the initial compromise in perfusion showed relative fluorescence maxima (transplant vs. surrounding) of 33% or 37%, respectively, whereas these values lay above 64% for all other examinations. Conclusion It was possible to prove the feasibility of endoscopic ICG angiographies in patients with free tissue transfer to the upper aerodigestive tract. The method is easy to perform and there were no adverse events. Especially in difficult situations (e.g. questionable Doppler signals, flaps situated far down in the pharynx...) the method seems to be a welcome adjunct to conventional screening. from 1st Scientific Meeting of the Head and Neck Optical Diagnostics Society London, UK. 14 March 2009

Endoscopic examinations of free flap perfusion in the head and neck region using red-excited Indocyanine Green