Abstract
The ability to noninvasively estimate arterial blood oxygen saturation in real time by spectrophotometric techniques (eg, Nelcor pulse oximeter, Hewlett-Packard ear oximeter) has dramatically aided patient management in surgical and intensive-care settings where continuous monitoring of tissue oxygenation is essential (as with cyanotic heart disease, thoracic surgery). Unfortunately, these oxygen saturation monitors measure only arterial blood oxygen saturation and not arterial blood oxygen tension, another measure of tissue oxygenation preferred by many clinicians. (Although noninvasive transcutaneous oxygen tension monitoring is commonplace in monitoring the neonate, the technique is not yet reliable enough to use in the general clinical population. This is especially true in shock states, where skin perfusion is severely impaired.)
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