Shock reduction using absolute calibrated tissue oxygen saturation and total hemoglobin volume fraction
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United States of America Patent
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Sep 8, 2015
Grant Date -
Dec 16, 2010
app pub date -
Jun 10, 2010
filing date -
Jun 10, 2009
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Abstract
An implantable medical device for detecting and treating an arrhythmia includes an optical sensor adapted for positioning adjacent to a blood-perfused tissue volume. In one embodiment for controlling arrhythmia therapies delivered by the device, the optical sensor is controlled to emit light in response to detecting an arrhythmia, detect light scattered by the volume of blood perfused tissue including measuring an optical sensor output signal corresponding to the intensity of scattered light for at least four spaced-apart wavelengths, and compute a volume-independent measure of tissue oxygen saturation from the detected light. The hemodynamic status of the arrhythmia is detected in response to the measure of tissue oxygen saturation.
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