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. 2011 Jan 31;11(2):1784–1793. doi: 10.3390/s110201784

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© 2011 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 4. — (a) Typical real features of a pulse wave and a first pulse wave combined to provide the main pulse and the reflective pulse. (b) Regression analysis equation for the estimated algorithm of blood pressure needs the following 6 major correlative factors; (1) the period of the pulse wave, (2) the time of the systolic period, (3) the reflective time, (4) the notch time, (5) the ratio of area (systolic period area/diastolic period area), and (6) the increasing pressure index (reflective wave peak/systolic wave peak).