My 82 year old mother has been diagnosed with breast cancer in her remaining breast (she had a mastectomy on one side 10 years ago). Mom is on oxygen (emphazema), is about 50 pounds overweight, and leads an extremely sedate life. Her surgeon wants to perform a mastectomy under twilight instead of general anesthesia because of her health concerns. Does this sound appropriate? I live in another state and could not accompany her to her surgeon's appoinment to ask questions and mom just accepts whatever doctors tell her.