PubMed:2626472 JSONTXT 3 Projects

[Photoplethysmography (PPG) or photoreflexometry (PRM): principle and reproducibility (study of the validity of the method in healthy subjects)]. Photoplethysmography, a non-invasive vascular exploratory test, has recently made great in the evaluation of venous haemodynamics. The principle of Photoplethysmography uses the cutaneous reflection of infrared light in the intradermal venous plexi. Then methods are presented for a reliable implementation of the tests. Validity of the method is verified by applying statistical tests to measurements carried out in two healthy subjects. In conclusion, Photoplethysmography may be produced, providing that the method used is strict, that three successive measurements are carried out, so that only the mean value is considered; because of the low value of the variability index of the total filling time, this parameter is used in the interpretation of the method.