RecruitingClinical trialContinuous Monitoring of Microvascular Anastomoses: An Observational TrialThis study is being done to see whether signals from a device that monitors blood flow through the free flap can be recorded and converted from an audible signal, like a heartbeat, into a visual signal. Researchers plan to use this information to ultimately help surgeons and care teams monitor free flaps to try to prevent flap failure.