<prompt> Changes occuring in vessels in Raynauds disease are all except -AsphyxiaRecoveryHyperfusionSyncope  <response>: Ans. is c i.e., Hyperperfusion Three stages are observed with exposure to cold or emotional disturbances. These are -Stages of local syncope - On cold exposure - digital arterioles go in spasm and blood flow decreases, pallor or blanching is observed Stage of blanching.Stage of local asphyxia - With gradual warming there is slow relaxation of arterioleso Slowly flowing blood becomes easily deoxygenated - the part becomes dusky or cyanosed Stages of dusky anoxia.C Stage of recovery -o Attack passes off - arterioles are fully relaxed - oxygenated blood returns into dilated capillaries - fingers becomes red and swollen Stage of red engorgement. 