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Abstract

An apparatus for estimating an intraarterial blood pressure of a living subject, based on information non-invasively obtained from a circulatory organ of the subject, including: a first device for obtaining first information which relates to velocity of propagation of a pulse wave; a second device for obtaining at least one of second information which relates to heart rate and third information which relates to an area defined by a volume pulse wave; a third device for estimating, according to a predetermined relationship to between (A) blood pressure, and (B1) first information and (B2) at least one of (B21) second information and (B22) third information, the blood pressure, based on the first information and the at least one of the second information and the third information, the predetermined relationship being defined by a numerical expression including a plurality of predetermined coefficients; and a fourth device for selecting, from a plurality of groups of predetermined coefficients which correspond to a plurality of blood-pressure ranges, respectively, one group of predetermined coefficients which corresponds to a blood pressure, so that the third device estimates the blood pressure according to the numerical expression including the selected group of predetermined coefficients.

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