Cephalad spread of epidural blockade in a 15-degree head-down position.
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D000368:Aged; D000369:Aged, 80 and over; D000767:Anesthesia, Epidural / Q000009:adverse effects*; D005260:Female; D018475:Head-Down Tilt / Q000009:adverse effects*; D006801:Humans; D012131:Respiratory Insufficiency / Q000139:chemically induced*