Sequence of changes seen in Raynaud's disease is: March 2012: (A) Red, blue, white, (B) White, blue, red, (C) Red, blue, white, (D) White, red, blue
Answer is B. Ans: B i.e. White, blue, red Raynaud's disease is recognized by the characteristic sequence of blanching (constriction of vessels), dusky cyanosis (dilation of capillaries & filling with slowly flowing deoxygenated blood) & red engorgement (relaxation of aerioles & return of oxygenated blood into the dilated capillaries)