Medical and Biological Engineering and Computing

, Volume 43, Issue 1, pp 131–135 | Cite as

Non-invasive measurement of systolic blood pressure on the arm utilising photoplethysmography: development of the methodology

  • C. Laurent
  • B. Jönsson
  • M. Vegfors
  • L. -G. Lindberg


Photoplethysmography (PPG) can be used to measure systolic blood pressure at the brachial artery. With a specially designed probe, positioned in the most distal position beneath a pressure cuff on the upper arm, this is possible. The distance between the light source (880 nm) and the photodetector was 20 mm. A test was performed on neuro-intensive care patients by determining blood pressure from the PPG curves, and, when it was compared with systolic blood pressure obtained from inserted indwelling arterial catheters, a correlation factor of r=0.95 was achieved. The difference between blood pressure obtained using PPG and invasive blood pressure measurement was 3.9±9.1 mmHg (mean±SD), n=19. The depth to the brachial artery was 13.9±4.1 mm (mean±SD), n=18. A digital PPG system utilising pulsating light was also developed.


Photoplethysmography Blood pressure Occlusion cuff Non-invasive Arm PPG 


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Copyright information

© FMBE 2005

Authors and Affiliations

  • C. Laurent
    • 1
  • B. Jönsson
    • 2
  • M. Vegfors
    • 3
  • L. -G. Lindberg
    • 1
  1. 1.Department of Biomedical EngineeringLinköpings universitetSweden
  2. 2.Department of Cardiovascular Surgery & AnaesthesiaLinköping University HospitalSweden
  3. 3.Department of AnaesthesiologyLinköping University HospitalSweden

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