CPC A61B 5/7278 (2013.01) [A61B 5/02007 (2013.01); A61B 5/029 (2013.01); A61B 5/02116 (2013.01); A61B 2560/0223 (2013.01)] | 16 Claims |
1. An apparatus for estimating blood pressure, the apparatus comprising:
a photoplethysmogram (PPG) sensor configured to measure a bio-signal from a user at a measurement time; and
a processor configured to:
extract, from the bio-signal, a cardiac output (CO) feature value and a total peripheral resistance (TPR) feature value,
in response to determining that the user is in a non-stable state based on a heart rate change of the user that is monitored at a same time as the blood pressure is estimated, obtain a CO variation in the CO feature value between the measurement time and a reference time, a TPR variation in the TPR feature value between the measurement time and the reference time, and a product of the CO variation and the TPR variation,
adaptively determine a combination coefficient for combining the CO variation, the TPR variation, and the product of the CO variation and the TPR variation, based on a reference value associated with vascular compliance, and
estimate a blood pressure by combining the CO variation, the TPR variation, and the product of the CO variation and the TPR variation, using the combination coefficient.
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