Calibrating for Blood Pressure Using Height Difference
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United States of America Patent
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Oct 20, 2016
app pub date -
Apr 12, 2016
filing date -
Apr 14, 2015
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Abstract
The technology described in this document can be embodied in a method that includes obtaining a first pulse transit time (PTT) measurement and a second PTT measurement for a subject. The PTT represents a time taken by a pulse pressure wave traveling to the wrist of the subject. The first PTT is measured when the wrist of the subject is at a first height, and the second PTT is measured when the wrist of the subject is at a second height. The method also includes computing a hydrostatic difference in blood pressure as a function of the difference between the first height and the second height, and computing a calibration metric as a function of (i) the hydrostatic difference in blood pressure, and (ii) the difference between the first PTT and the second PTT.
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