<prompt> Sympathectomy is indicated in all following conditions exceptIschemic ulsersCausalgiaAnhidrosisAcrocyanosis  <response>: . Anhidrosisabsence of sweatingis the contraindication ,because hyperhidrosis is the indication of the sympathectomy.other ibdications include cervical rib with vascular manifestations,raynauds phenomenon,causalgia,sudecks osteodystrophy,upper limb vasospasam due to other causes etc... Refer page no 187 of SRBs manual of surgery 5th edition. 