Effects of dexmedetomidine, fentanyl and magnesium sulfate added to ropivacaine on sensory and motor blocks in lower abdominal surgery: a randomized clinical trial.

The three groups were comparable in terms of SPO2 and there was no significant difference among groups ( P = 0.377) and the changes of this variable over time did not have a significant trend ( P = 0.127).

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