[Significance of subjective symptoms in the diagnosis of hyperviscosity syndrome].

A questionnaire including 9 main signs: headache, vertigo, vision and hearing derangement, fatigue, hemorrhage, somnolescence, loss of appetite has been elaborated and introduced into the clinical practice. It was revealed that patients with Sjögren's syndrome had an elevated viscosity of the serum in 30% of the cases. These patients complained of headache and vision derangement more often than those with normal indices, though in the first group it did not reach critical values corresponding to an extended clinical picture of the hyperviscous syndrome.