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Nevada company, ORNL develop potential lifesaver
Date:12/20/2007

p>Our key contributions were to reduce the system to an integrated circuit, or chip, to reduce the amount of power needed to operate the unit and to lower the cost, Ericson said.

Before we could do that, however, as a team we had to better understand the product as a circuit that has to operate in a wide range of temperatures yet maintain a high degree of accuracy, Britton said.

The ZOE Fluid Status Monitor measures thoracic base impedance, which is a measurement of the electric current traveling from the top to the bottom of the thorax. This is accomplished by placing one electrode at the top and another at the bottom of the breastbone. The less resistance measured in ohms the more fluid in the chest. The normal range for people is between 19 ohms and 30 ohms. Values lower than 19 indicate that a person may be overhydrated while values exceeding 30 indicate dehydration.

The measurement is a quick and easy method to determine whether a person is experiencing fluid congestion or dehydration, DeMarr said. Studies have shown that Zo, or the base resistance, is an early predictor of congestion in heart failure, showing decreases as early as two weeks prior to weight gain and other symptoms.

A wearable wireless version of the ZOE instrument, ZOEwi, will allow monitoring during activity and is planned for market introduction in 2008, according to Jeremy Copeland, vice president of marketing for Noninvasive Medical Technologies.


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Contact: Ron Walli
wallira@ornl.gov
865-576-0226
DOE/Oak Ridge National Laboratory
Source:Eurekalert

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