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Abstract

Apparatus is disclosed for deriving weighted values SHD i, DHD i and MHD i to respectively represent the systolic, diastolic and mean blood pressures for each heartbeat of a patient from the values S.sub.i, D.sub.i and M.sub.i that are the maximum, minimum and means blood pressures of the current heartbead; S.sub.i-1, D.sub.i-1 and M.sub.i-1 that were the maximum, minimum and mean blood pressures for the previous heartbeat; SHD i-1, DHD i-1 and MHD i-1 that respectively represented the systolic, diastolic and means blood pressures of the previous heartbeat; and a constant K.sub.i that is a function, F, of the difference between M.sub.i and the mean pressure M.sub.i-1 of the previous heartbeat. The expressions for S.sub.i, D.sub.i, M.sub.i and K.sub.i are as follows: ##EQU1##

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First Claim