The Chinese Solar Machine Layer by Layer Fire in the Library The Mystery Behind Anesthesia
A simple finger-clip device is able to monitor blood loss accurately -- without the need for more invasive or expensive procedures.
Patients who lose too much blood during surgery can suffer heart attacks.
But measuring blood volume requires either inserting a catheter into the pulmonary artery, ordering an expensive echocardiogram, or resorting to guesswork.
Kirk Shelley, an anesthesiologist at Yale University, has devised a way to noninvasively measure blood loss using a pulse oximeter, a finger-clip device commonly used to measure pulse rate and blood oxygen levels in hospital patients. The pulse oximeter measures how much light of different wavelengths the blood absorbs.
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