[Contribution of methods of exploration of the distal vascular bed to the diagnosis and general comprehension of Raynaud's phenomenon].

Current vascular investigations permit a better understanding and placing of Raynaud's Phenomenon from the nosological point of view. This work contains a study of the contributions made by digital rheography, arteriography and pulp biopsy. These methods allow us on the one hand to define the concept of Raynaud's diathesis, an essential element necessary to the appearance of vasomotor crises, and on the other hand to identify the possible triggering causes on which depend certain cases of Raynaud's phenomenon of idiopathic appearance, sometimes clinically latent. The general conception of Raynaud's Phenomenon, defined from the semeiological point of view and corresponding to a pathology and a diathesis common to the various conditions in which it may appear, is confirmed by the data provided by these investigations. The diagnostic approach in Raynaud's phenomenon has thus a double perspective: --to identify and define the Raynaud's diathesis, --to seek the possible causes which may be clinically latent.