Stellate Ganglion Block for Prevention of Post Mastectomy Depression

This study is testing whether a nerve block procedure called a stellate ganglion block — an injection in the neck that briefly calms part of the nervous system — can help prevent depression after mastectomy (surgical removal of the breast for cancer). **You may be eligible if...** - You are a female patient aged 18 to 65 - You have breast cancer in one breast and are scheduled for a unilateral modified radical mastectomy - You are otherwise in good general health (ASA class I or II) **You may NOT be eligible if...** - You are pregnant - You have a neurological or neuromuscular disease - You have an allergy to local anesthetics - You have neck abnormalities, prior neck surgery, or certain heart/lung conditions - You have a pre-existing history of depression, bipolar disorder, or other psychiatric disorders - You are currently taking pain medications Talk to your doctor to see if this trial is right for you.