The purpose of this study is to compare the clinical efficacy of real-time ultrasound guidance on spinal anesthesia vs the traditional anatomical landmark technique, by comparing success rate of spinal needle insertion, success rate rate of single needle pass, duration and immediate complications.
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success rate of spinal needle insertion
Timeframe: during the procedure of spinal anesthesia
success rate of single needle pass
Timeframe: during the procedure of spinal anesthesia