Figure 2  .

Measurement of finger systolic pressure after digital cooling in a patient with Raynaud's phenomenon. The upper trace shows flux in fingertip skin. The middle trace shows temperature around the middle phalanx of the finger. The bottom trace shows pressure in the cuff surrounding the proximal phalanx. A = proximal cuff inflation to 200 mm Hg with simultaneous middle phalangeal cooling to 15°C abolishes flux; B = after five minutes' cooling, gradual cuff deflation; C = no return of flux when cuff pressure is 0 mm Hg, rewarming started; D = return of flux after digital rewarming. Part of the recording during cooling and occlusion between A and B has been omitted.