[Current methods of vascular exploration: Doppler, thermography, capillaroscopy].

According to a national study, the currently available vascular investigations give fragmentary information. Ultrasound velocimetry is usually normal, but sometimes, it reveals, early in the course of the disease, an original finding, diastolic flow. Thermography demonstrates thermic gradients in phase I, hyper- or iso-thermia in phase II and hypothermia in phase III. Capillaroscopy can demonstrate pericapillary edema, venulo-capillary stasis and tortuosities which are non-specific criteria, only significant by their associations. This study needs to be pursued in order to define the course of these vasomotor changes.