Response of Digital Blood Pressure to Cold Provocation in Cases with Raynaud Phenomena

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Abstract
A new diagnostic test of the qualitative and quantitative evaluation of vasospastic disorders is described. It entails measurement of systolic digital artery pressure during successive cooling from 35-5.degree. C. In [human] cases with vasospastic disorders with Raynaud phenomena a significant reduction of systolic blood pressure < 78% of control level is observed and in the most pronounced cases total cessation of flow occurs (critical closing). The test is a quantitative measure of the degree of vasospasm since the pressure reduction correlates to the clinical degree of vasoconstriction.

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