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Abdomen Can Help In Gas Exchange In Lung Failure

Researchers at the University of Pennsylvania School of Medicine have collaborated in an effort to create a technique in animal models that allows// the abdominal cavity to perform the function of exchanging gases, a function primarily performed by the lungs. This may help lungs recover better in lung failure and also give supplementation to the ventilator, the researchers say in the August issue of Chest, the journal of the American College of Chest Physicians.

"This is an alternate, novel way to deliver oxygen to the body that does not attempt to wring more function out of an already injured lung, by using ventilator settings that can actually exacerbate the underlying lung injury. The only other alternates that can 'rest' the lung involve variations of bypass machine technology, all of which require anticoagulation," explains Joseph Friedberg, MD, Associate Professor of Surgery and principal investigator of this study. "The ability to rest the lungs and provide supplemental oxygen with a technique that appears nontoxic and does not require anticoagulants could have huge implications some day for patients suffering from potentially reversible pulmonary failure from such diseases as: anthrax, bird flu, SARS, trauma, ARDS, pulmonary embolism, pneumonia and others. Sometimes patients have a condition in which they might have a chance to recover if they could survive the most severe phase of their disease."

The system these researchers developed involves recirculating a gas-carrying liquid through the abdomen to deliver oxygen. They tested the system in adult pigs that were put to sleep and ventilated with low concentrations of oxygen to simulate lung failure. Using this technique, they observed an increase in arterial oxygen saturation (the actual percentage of blood that's carrying oxygen) from 73% to 89%. Doctors generally aim to keep the oxygen saturation of patients in the 90% range. Friedberg adds, "If this experimental finding can be tra
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