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Remote monitoring of free flaps with telephonic transmission of photoplethysmograph waveforms.

Analog waveforms from bedside photoplethysmograph flap-monitoring devices have been transmitted via telephone lines to remote monitoring stations. Two methods for data transfer have been successfully used in clinical practice. One employs equipment similar to that used for transmission of EKG signals; the second uses paired microcomputers linked with telephone modems. These readily available technologies enable remote evaluation of the adequacy of perfusion of free tissue transfers.