Blood Pressure Estimation According to Photoplethysmographic Signal

This paper proposes a method for indirect systolic blood pressure estimation based on photoplethysmographic signal steepness. The proposed method was evaluated on 10 healthy subjects, aged 25±3 yrs., including 8 males and 2 females. The photoplethysmographic signal was obtained using a photoplethysmography device that is put on a finger, while reference blood pressure was measured using a semi-automatic OMRON blood pressure monitor. A significant 0.8550.025 (p < 0.001) correlation between the photoplethysmographic signal steepness and systolic blood pressure was discovered. The estimated systolic blood pressure obtained using the proposed method differed from the reference blood pressure by 3.8±4.2mmHg. The obtained results meet the AAMI (Association for the Advancement of Medical Instrumentation) requirements (5 ± 8mmHg). The results demonstrate that the photoplethysmographic signal wavefront can be applied successfully in wearable devices that can be used for 24 hour registration of blood pressure for both home use and clinical practice.

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