A Wireless PPG Sensor Applied Over the Radial Artery – A Pilot Study
2006 (English)In: E-Health - Proceedings of Med-e-Tel 2006: The International Trade Event and Conference for eHealth, Telemedicine and Health ICT / [ed] Malina Jordanova, Frank Lievens, Luxexpo , 2006, 199-202 p.Conference paper (Refereed)
Photoplethysmography (PPG) is a well known non-invasive technique in the medical field. It is mainly used for monitoring skin perfusion and oxygen saturation. PPG measures changes in intensity of light that has been emitted into the skin and reflected or transmitted towards a photo detector. There is no exact knowledge of the mechanisms behind the PPG signal but it has been suggested that the pulsatile component is related both to pulsatile volume changes due to varying lumen of the vessel and to red cell orientation during each cardiac cycle.
A specially designed wireless PPG sensor has been developed for application over the radial artery to gain centrally related blood flow variables. A study was performed to assess the relationship between the PPG signal and several physiological parameters. Recordings were made using an arrangement of a Doppler ultrasound probe, a non-invasive blood pressure measuring device (Portapres), an impedance measuring device that records respiratory work and a wireless PPG measuring device attached over the radial artery. All signals were recorded simultaneously and analyzed afterwards.
The measurements showed a close relationship between the recorded variables. The strongest correlation was found between pulsatile PPG and blood velocity (measured by Doppler ultrasound). This correlation was most obvious during hyperventilation. In this case there was also a strong correlation between PPG and blood pressure measured by Portapres. The recordings also showed that forced deep respiration could be observed both by PPG and Portapres.
•the PPG signal may reflect blood pressure variations as well as a velocity related component in the radial artery
•respiratory events may be observed in the radial artery using PPG
•the wireless PPG sensor system is a new tool for monitoring centrally related physiological parameters but with limited batterylifetime as a drawback
Place, publisher, year, edition, pages
Luxexpo , 2006. 199-202 p.
Blood pressure, Blood velocity, Non-invasive, Photoplethysmography, Wireless
IdentifiersURN: urn:nbn:se:liu:diva-131475OAI: oai:DiVA.org:liu-131475DiVA: diva2:972747
Med-e-Tel 2006 Conference, Luxembourg, Luxembourg, April 5-7, 2006