摘要：

The purpose of this randomized, double-blind, placebo-controlled trial is to study the effect of adding various doses of fentanyl to 2.2 mL of bupivacaine (0.5% hyperbaric), for spinal anesthetic in non-obstetric population undergoing superficial lower abdominal surgery (hernia repair). A population of 60 patients belonging to ASA classes I and II, scheduled for elective inguinal hernia...

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