title: Letter: A double catheter epidural technique for major surgery.
mesh_terms: D000328:Adult; D000368:Aged; D000767:Anesthesia, Epidural / Q000379:methods*; D002404:Catheterization / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D013514:Surgical Procedures, Operative