Determination of oscillometric blood pressure by linear approxim

Details Determination of oscillometric blood pressure by linear approxim Determination of oscillometric blood pressure by linear approxim

1995-01-13

1996-11-26

Sykes, Angela D.

Surgery

Truss

Pad

128682, A61B 0500

Patent

active

055775080

ABSTRACT:
An automated sphygmomanometer which models the oscillometric envelope as two lines through the points defined by pressure and amplitude which are determined during the oscillometric blood pressure determination. One of the lines is the best fit through the points on the low pressure (diastolic) side of the oscillometric envelope, while the other line is the best fit through the points on the high pressure (systolic) side of the oscillometric envelope. The dividing point for the low and high pressure sides is chosen as the point where the best fit line through the points on one side and the best fit line through the points on the other side have the greatest amplitude at the point of intersection. The result is a linear approximation of the oscillometric envelope by two lines forming a triangle with the baseline. A second pass is preferably performed to improve the linear approximation by eliminating points with oscillation amplitudes that are outside of the area of interest. The best fit lines are then recalculated from the remaining points, and the points where the best fit lines intersect (or some function thereof) is then used as MAP and for determining the systolic and diastolic pressures. The resulting method for calculating systolic, MAP, and diastolic pressures is less sensitive to erroneous oscillation amplitudes since all points in the area of interest along the oscillometric envelope are weighted equally.

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