1. Calculation of central blood pressure by analyzing the contour of the photoplethysmographic pulse measured at the finger with the pOpmètre® device
- Author
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M. Hallab, Stéphane Laurent, Pierre Boutouyrie, Hasan Obeid, and Hakim Khettab
- Subjects
Pulse (signal processing) ,business.industry ,Healthy subjects ,Essential hypertension ,medicine.disease ,Blood pressure ,Central blood pressure ,Volume (thermodynamics) ,Contour analysis ,Cuff ,Medicine ,Cardiology and Cardiovascular Medicine ,business ,Biomedical engineering - Abstract
Analysis of the contour of the peripheral pulse to assess arterial properties was first described in the nineteenth century. The reference technique to estimate central blood pressure (CBP), non-invasively, is by analyzing the radial pressure pulse acquired using a tonometer and then to establish a transfer function relating the radial pressure to the CBP. An alternative technique utilizes a volume pulse. This may conveniently be acquired optically from a finger. This technique deserves further consideration because of its simplicity and ease of use. The objective is to establish a transfer function estimating the central blood pressure (CBP), calibrated with a brachial pressure cuff and using the parameters obtained with the contour analysis of the photoplethysmographic pulse measured at the finger with the pOpmetre® system. We positioned the photodiode sensor on the finger, insuring that the sensor's lens is in contact with the finger. Brachial blood pressure measurements was performed with a standard cuff. The central blood pressure values measured with Sphygmocor used as the reference values. Multiple regression analysis was done to establish the transfer functions. Sixty-nine subjects were included: 24 healthy subjects and 45 patients with essential hypertension aged 33 ± 8 years and 59 ± 17 years respectively. The correlation between the estimated central systolic pressure (CSP) and the reference one, was good and significant (r2 = 0.91; P
- Published
- 2018