Apparatus and method for estimating blood pressure

A method of estimating blood pressure by an apparatus, the method comprising:

• receiving, from a user via an input interface of the apparatus, an input;
• measuring a bio-signal from an object;
• obtaining a cardiac output (CO) feature based on the bio-signal;
• determining a variation of the CO feature at a blood pressure measurement time relative to a calibration time;
• determining whether the variation of the CO feature is within a predetermined range;
• obtaining a total peripheral resistance (TPR) feature by combining an amplitude of a propagation wave component and amplitudes of at least two reflection wave components of the bio-signal, in response to the variation of the CO feature being within the predetermined range;
• obtaining the TPR feature by combining the amplitude of the propagation wave component and an amplitude of one reflection wave component of the at least two reflection wave components, in response to the variation of the CO feature not being within the predetermined range;
• estimating blood pressure based on the CO feature and the TPR feature;
• and
• providing the estimated blood pressure to the user via an output interface of the apparatus.

An electronic device comprising:

• a main body;
• a photoplethysmogram (PPG) sensor disposed on one surface of the main body and configured to measure a PPG signal from an object;
• and
• a processor configured to:
• receive, from a user via an input interface of the electronic device, an input;
• obtain a cardiac output (CO) feature based on the PPG signal;
• obtain a total peripheral resistance (TPR) feature by combining an amplitude of a propagation wave component and amplitudes of at least two reflection wave components of the PPG signal, in response to a variation of the CO feature at a blood pressure measurement time relative to a calibration time, being within a predetermined range;
• obtain the TPR feature by combining the amplitude of the propagation wave component and an amplitude of one reflection wave component of the at least two reflection wave components, in response to the variation of the CO feature not being within the predetermined range;
• estimate blood pressure based on the CO feature and the TPR feature, and
• provide the estimated blood pressure to the user via an output interface of the electronic device.