Selective spinal analgesia.
D000368:Aged; D000775:Anesthesia, Spinal / Q000009:adverse effects*; D006801:Humans; D007022:Hypotension / Q000139:chemically induced; D007040:Hypoventilation / Q000139:chemically induced; D007278:Injections, Spinal; D008297:Male; D009020:Morphine / Q000008:administration & dosage
D009020:Morphine