title: Hypobaric versus hyperbaric spinal anesthesia in geriatric surgery.
mesh_terms: D000328:Adult; D000368:Aged; D000775:Anesthesia, Spinal / Q000009:adverse effects / Q000379:methods*; D005853:Geriatrics; D006801:Humans; D006982:Hypertonic Solutions; D007022:Hypotension / Q000139:chemically induced; D007038:Hypotonic Solutions; D008875:Middle Aged; D013514:Surgical Procedures, Operative; D013748:Tetracaine / Q000008:administration & dosage / Q000009:adverse effects
chemical_list: D006982:Hypertonic Solutions; D007038:Hypotonic Solutions; D013748:Tetracaine