Digital blood pressure and flow measurements in patients with primary Raynaud's phenomenon.

The value of digital systolic blood pressure (DBP) and flow (DBF) measurements for a quantitative diagnosis of Primary Raynaud's Phenomenon (PRP) was evaluated by comparing the results obtained in 10 patients and 20 normals. Digital skin temperature (DST), DBP and brachial systolic blood pressure (BBP) and DBF were measured at room temperature, at maximal vasodilatation and during cold provocation. At room temperature DST discriminates between normals and patients with an accuracy of 77%. On maximum vasodilatation no significant differences can be found in DBP and DBF between normals and patients. However, DBF was significantly different between male and females both in normals and in patients. During gradual cooling a decrease in DBF (a closing phenomenon) was observed both in normals and patients. In contrast DBP did not show a substantial pressure drop. Calculating digit to brachial systolic pressure indexes (DBI) a slight significant increase can be found during cold provocation both in normals and in patients. Only the DBI of digit IV during cold provocation showed a significant difference between normals and patients which resulted in an accuracy of 83%.