Quantitative evaluation of anastomotic perfusion during colorectal surgery via indocyanine green fluorescence angiography: a narrative review.

In our preliminary study which aimed to apply the ICG quantitative curve in evaluating anastomotic perfusion, we found that the ICG quantitative curve in patients with satisfactory anastomotic perfusion exhibited an apparent increasing trend in the initial stage (also called the filling period), then the fluorescence intensity gradually increased to the peak value; after that, the fluorescence intensity exhibited a decreasing trend (also called the reducing period), during this period, the decreasing trend was relatively slow; finally, the fluorescence intensity decreased to a certain level and remained unchanged (this period also called platform period) ( Figure 2A-2E ).

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