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Mathematics taking guesswork out of plastic surgery tissue transfer
Date:7/14/2009

COLUMBUS, Ohio Plastic surgeons are turning to mathematics to take the guesswork out of efforts to ensure that live tissue segments that are selected to restore damaged body parts will have enough blood and oxygen to survive the surgical transfer.

In the world's first published mathematical model of tissue transfer, mathematicians have shown that they can use differential equations to determine which tissue segments selected for transfer from one part of the body to another location on the same body will receive the level of oxygen required to sustain the tissue.

The most common tissue transfers are used to restore body parts destroyed by cancer and trauma. The researchers say reliable mathematical modeling of the blood supply and oxygen in tissue segments will not only reduce failures in reconstructive surgery, but will also improve understanding of conditions in which an adequate blood supply is a basic problem, such as heart disease, cancer and stroke.

To obtain tissue for reconstructive surgery, plastic surgeons cut away a segment of tissue, called a flap, that is fed by a single set of perforator vessels an artery and vein that travel through underlying muscle to support skin and fat. Surgeons generally agree that vessels at least 1.5 millimeters in diameter are required to sustain oxygen flow within the flap intended for transfer.

"That guideline is based upon experience, trial and error. What we need is a more precise ability to determine what the necessary blood vessel size really is," said Michael Miller, professor of surgery and director of the division of plastic surgery at Ohio State University and a senior author of the research.

"I'm convinced that there is a relationship that's probably very predictive between the diameter and blood flow in the vessel and the ability of the piece of the tissue we're transferring to survive based on that."

Mathematicians working on the problem have set out
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Contact: Michael Miller
michael.miller@osumc.edu
614-293-8566
Ohio State University
Source:Eurekalert

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