Impedance monitoring for subcutaneous free flap transfers.
The assessment of thoracic blood flow by electrical impedance is a well-established technique. In an application of this a small electrode array has been developed in which an alternating electric current is passed through a subcutaneous free flap and the induced voltage across a small volume measured. A graphical display of this changing voltage illustrates the pulsatile flow through the flap, allowing continuous assessment of perfusion on a beat by beat basis. The electrode array is such that it can be placed in close contact with muscle without interface problems and can assess its viability. It is non-invasive and easily removed. We have found this accurate, easily interpreted by inexperienced staff, and a considerable reassurance in the postoperative period.
Department of Plastic Surgery, Mount Vernon Hospital, Northwood, Middlesex.
D H
DH
Harrison
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G
Mott
D006801:Humans; D008991:Monitoring, Physiologic / Q000379:methods*; D010992:Plethysmography, Impedance; D011182:Postoperative Care / Q000379:methods; D011673:Pulsatile Flow; D013524:Surgical Flaps; D014654:Vascular Patency