Abstract

Blood pressure is an important physiological parameter to be monitored. For several medical conditions, it is important to quickly know the rise or fall in blood pressure. While researchers are working to evolve a reliable continuous noninvasive arterial pressure (CNAP) monitoring devices based on sophisticated signal processing with various technologies including Peñáz principle & pulse wave velocity (PWV); we present a very simple system to continuously indicate the variations in blood pressure. Using the typical shapes of the pulse wave obtained by infra-red photoplethysmography (PPG) from brachial and radial artery, we estimate the changes in pulse transit time (PTT). This change is effected onto a change in tone of an audio beep. The simple circuit was assembled and tested. The details are presented in the paper.

Keywords: Pulse wave velocity · Pulse transit time · Blood pressure · Differential amplifier · Photoplethysmography

References

  1. 1.T.G. Pickering, et al. , “Recommendations for blood pressure measurement in humans,” in AHA Circulation, vol. 111, pp. 697-716, 2005.
  2. 2.Fortin, J., Marte, W., Grüllenberger, R., Hacker, A., Habenbacher, W., Heller, A., Wagner, C., et al. (2006)., “Continuous non-invasive blood pressure monitoring using concentrically interlocking control loops”. Computers in biology and medicine, vol 36(9), pp 941–57.
  3. 3.Brickman AM, et al., “Long-term Blood Pressure Fluctuation and Cerebrovascular Disease in an Elderly Cohort”, in Archives of Neurology 67 (5): pp- 564– 569, 2010.
  4. 4.http://en.wikipedia.org/wiki/continous_noninvasive_arterial_pressureaccessed 6th June, 2014.
  5. 5.Wesseling, K. H. “A century of noninvasive arterial pressure measurementfrom MAREY TO PENAZ & FINAPRES,” in Homeostasis om health and disease, vol 36, no.2-3 (1995): pp 50-65.
  6. 6.J. Blacher, R. Asmar, S. Djane, and Safar ME, “Aortic pulse wavevelocityasamarkerofcardiovascularriskinhypertensive patients”. In Hypertension 33 (5), (May 1999, pp -1111–7
  7. 7.JM Padilla, et al. , “Assessment of Relationships between Blood Pressure, Pulse Wave Velocity and Digital Volume Pulse,” in Computers in Cardiology 2006, 33, pp- 893−896.
  8. 8.Josep Sola, S F Rimoldi and Y. Allemann, “ ambulatory monitoirng of cardiovascular system : role of Pulse wave velocity,” in New developments in biomedial engineering, Intech Open, 2012.
  9. 9.J. Bhattacharya, P. P. Kanjila, and V. Muralidhar, “Analysis and characterisation of photo-plethysmographic signal,” IEEE Trans. Biomed. Eng., vol. 48, no. 1, pp. 5–11, Jan. 2001
Majmaah Journal of Health Sciences · eISSN 1658-8223 · Majmaah University · open access