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![Detecting flap compromise: an updated review of techniques to monitor microsurgical flaps post-operatively in breast reconstruction](https://image.oaes.cc/4cafd53f-d148-439b-8c83-b2db777672bd/5863.fig.1.jpg)
Figure 1. Types of non-invasive and invasive techniques used for flap monitoring. (A): Example of a non-invasive tissue oximetry device; (B): Example of an invasive venous coupler and implantable Doppler monitoring device; (C): Example of an invasive transcutaneous oxygen tension monitoring device.