Association between capillaroscopy, haemorheological variables and plasma proteins in patients bearing Raynaud's phenomenon.

Raynaud's phenomenon is a paroxysmal and reversible vasospasm affecting generally the acral circulatory regions. The relevance of the haemorheological alterations in these patients, as a source of ischemic events has been neglected. The objective of the present work was to evaluate and correlate the rheological blood properties, some biochemical parameters, e.g., plasma fibrinogen and immunoglobulin levels, and periungual capillaroscopy. The explicative variables considered were: blood viscosity, plasma viscosity, erythrocyte rigidity index, plasma fibrinogen, erythrocyte sedimentation rate, erythrocyte aggregate size, erythrocyte aggregation rate and serum immunoglobulin (IgG and IgM). The response variable was the nailfold capillary pattern categorised as either normal or pathological. Fibrinogen, erythrocyte aggregation rate and IgM are significantly higher in patients with a pathological pattern in comparison with patients bearing a normal one. The statistical analysis enabled us the modelling of the pathological pattern occurrence probability in function of plasma fibrinogen. Consequently, 100 mg/dl plasma fibrinogen increase, increases twice the probability of presenting a pathological pattern. Therefore, we can conclude that high levels of fibrinogen in Raynaud's phenomenon patients are associated with impaired skin microcirculation assessed by periungual capillaroscopy.