In arteriovenous fistula surgery, the effect of infraclavicular brachial plexus block and local anesthesia on tissue oxygenation and the effect of primary patency of the AV fistula is intended to research.
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tissue oxygenation
Timeframe: beginning and every 5 minutes till the end of surgery
primary patency of the arteriovenous fistula
Timeframe: 1 month after the operation