Effect of confounding factors on blood pressure estimation using pulse arrival time
- Kim, Jung Soo; Kim, Ko Keun; Baek, Hyun Jae; Park, Kwang Suk
- Issue Date
- Institute of Physics
- physiological measurement, Vol. 29, Issue. 5, pp.615-624
- blodd pressure; pulse arrival time; PPG; arterial stiffness; confounding factor; multiple regression
- This paper describes advanced method for blood pressure estimation using pulse arrival time and two confounding factors that include information about heart cycle and arterial stiffness.
- Two confounding factors were selected and analyzed in blood pressure
estimation using pulse arrival time (PAT) for each individual. The heart
rate was used as the confounding factor for the cardiac cycle, and the
duration from the maximum derivative point to the dicrotic peak (TDB) in
the photoplethysmogram was used as another confounding factor representing
arterial stiffness. By considering these factors with PAT in multiple regression
analysis, the performance of blood pressure estimation is enhanced significantly
in the diastolic phase as well as in the systolic phase. The reproducibility of
this method was also validated with formerly obtained regression equations
from the training set. The correlation between estimated and measured blood
pressure decreased a little, but the validity was still maintained (r ∼=
shows the value of the method in non-intrusive blood pressure estimation for
individual patients and may be useful for various applications.
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