BLOOD PRESSURE ESTIMATION

According to an aspect, there is provided a computer-implemented method of estimating blood pressure of a subject. The method comprises (i) processing (101) a first blood volume signal to identify a plurality of blood volume signal segments each corresponding to a respective cardiac cycle of the subject, wherein the first blood volume signal comprises measurements of blood volume or changes in blood volume in a body part of the subject in a first time period; (ii) processing (103) a first respiration signal to identify a plurality of respiration cycles of the subject in the first time period, wherein the first respiration signal represents respiratory activity of the subject during the first time period, and wherein each respiration cycle comprises a plurality of respiration cycle phases; (iii) selecting (105) a subset of the plurality of blood volume signal segments, wherein the blood volume signal segments selected for the subset are blood volume signal segments corresponding in time to a same respiration cycle phase in the plurality of respiration cycles; and (iv) estimating (107) blood pressure of the subject based on morphology features of the blood volume signal segments in the subset.