The aim of the study is to compare the efficacy of T2, T3 sympathetic block using thermal radiofrequency versus chemical neurolysis in postmastectomy pain syndrome using perfusion index derived from pulse oximetry.
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Inclusion Criteria: * Female patients with postmastectomy pain syndrome * ≥ Age 18 years * ASA II-III Exclusion Criteria: * patient refusal * coagulation defects * abnormal kidney or liver functions * local infection at site of injection * bone metastases * severe cardiorespiratory disease