A new probe for ankle systolic pressure measurement using Photoplethysmography (PPG)
2005 (English)In: Annals of Biomedical Engineering, ISSN 0090-6964, E-ISSN 1573-9686, Vol. 33, no 2, 232-239 p.Article in journal (Refereed) Published
An automated method for ankle systolic pressure measurement, less operator dependent than the standard continuous wave (CW) Doppler technique, would imply an advantage both in patient measurements and in epidemiological studies. We present a new photoplethysmographic (PPG) probe that uses near-infrared light (880 nm) to detect pulsatory blood flow underneath the distal end of a standard pneumatic cuff. The probe is adapted to the anatomical conditions at the ankle, permitting recording of pressures in both ankle arteries separately. The validity of the equipment was tested with CW Doppler-derived systolic pressures and invasive blood pressure measurements for reference. In 20 healthy subjects, visual analysis of the PPG curves revealed a mean difference between CW Doppler and PPG measurements of –0.5 mmHg (SD 6.9). Corresponding results for the anterior and posterior tibial arteries separately were –1.8 mmHg (SD 6.2) and 0.9 mmHg (SD 7.3), respectively. A correct probe position was essential for the results. In direct recordings from the dorsalis pedis artery in 10 intensive care patients, PPG underestimated systolic pressure in the anterior tibial artery by 4.5 mmHg (SD 12.1). With further development, the PPG probe, integrated in the pneumatic cuff, may simplify measurements of ankle systolic pressures.
Place, publisher, year, edition, pages
2005. Vol. 33, no 2, 232-239 p.
near-infrared light, CW Doppler, leg, anterior tibial artery, posterior tibial artery, blood pressure determination
Medical and Health Sciences
IdentifiersURN: urn:nbn:se:liu:diva-28919DOI: 10.1007/s10439-005-8982-7Local ID: 14122OAI: oai:DiVA.org:liu-28919DiVA: diva2:249731