[Correlation between 2 methods of measuring cutaneous blood flow: photoplethysmography and xenon 133].

Photoplethysmography, cutaneous blood flow measurement by Xenon 133 were carried out before and after resolution by Puva therapy on a lesion and on the symmetrical healthy skin area of 29 psoriatic subjects. The increase of the blood pulsatility and cutaneous blood flows found before treatment, disappears after resolution. The correlation between the two methods is studied.