Cardiac cycle phase uncertainty: another source of error in indirect blood pressure measurement.
Cardiac cycle phase uncertainty causes a small error in indirect estimation of arterial blood pressure by sphygmomanometry. A simple analysis yields a statistical description of the error and a rule for its reduction: correct bias by adding to the systolic estimate and subtracting from the diastolic estimate one-half of the per-cardiac-cycle cuff deflation decrement. If several measurements are taken, the least-square estimate is approximately the arithmetic mean of the greatest and least of the bias corrected estimates.
Hatsell
C P
CP
Armstrong Laboratory, Brooks AFB, TX 78235.
D001795:Blood Pressure Determination; D006326:Heart Auscultation; D006347:Heart Sounds; D016018:Least-Squares Analysis; D015203:Reproducibility of Results