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 Noninvasive Trauma Monitors

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Date posted: 17/11/2008

Patients with severe injuries or serious infections run the risk of circulatory shock--a life-threatening condition in which the blood can't supply tissues with enough oxygen and nutrients. If shock is recognized in time, the patient can be resuscitated with oxygen, intravenous fluids, and medications. But catching shock early is no simple matter. A small infrared sensor currently under development at the University of Massachusetts Medical School promises to detect impending shock earlier than any other noninvasive test.

Traditionally, patients in critical condition are continuously monitored for changes in blood pressure, heart rate, and pulse oxygen saturation. But the body has mechanisms to compensate for massive blood loss and systemic infection, keeping those parameters steady even while the patient's status deteriorates. "When the blood pressure starts to drop, it's too late," says spectroscopist Babs Soller, who developed the new device along with colleagues at the UMass Medical School. "The patient is already going into shock." The new device instead measures the levels of oxygen, pH, and hematocrit--the proportion of red blood cells in the blood--in a patient's muscle tissue.

"Until now, we've either had noninvasive methods which are very insensitive, like blood pressure, or we've had sensitive methods that are invasive and cumbersome," says George Velmahos, chief of trauma, emergency surgery, and surgical critical care at Massachusetts General Hospital, who was not involved in developing the device. "So the noninvasive and continuous nature of this method is key."

See the full Story via external site: www.technologyreview.com



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