Relación entre el pulso fotopletismográfico digital y la presión arterial incruenta latido a latido ante el reto ortostático

Abstract

We present a method to examine the changes in the photoplethysmographic pulse (PhP) and its association with blood pressure (BP) beat to beat, applying it to healthy subjects in clinostatic and ortostatic position. PhP change is more significant in response to postural change than the corresponding increase of the arterial pressure. The spectral power of the PhP showed comparable frequency bands those of the arterial pressure, but the changes in each one are more evident that those of BP when the individual goes of clinostatic to ortostatic position. The coherence function showed that the linear relation in frequency between both parameters is fine among half to eight Hertz but the spectral gain between both signals is greater in ortostaitc position. These results make think that this type of study can have clinical importance when allowing that by photoplethysmography (simple nonbloody method and of low cost) we pruned to evaluate the arterial rigidity and other associated parameters, with the person laid down or standing up. With this, we think that the PhP may be to a fine indicator of cardiovascular adjusts caused for the change of clinostatic to ortostatic position, which can complement the well-know in the arterial pressure.