Analgesia Nociception Index（ANI）which is derived by heart rate variability, can be used to detect noxious stimulation during general anesthesia. Combined spinal epidural anesthesia can affect heart rate variability by blocking anterior and posterior roots of spinal nerve and spinal cord. The aim of this study is to observe ANI under combined spinal epidural anesthesia.
Analgesia Nociception Index can be used to detect noxious stimulation during general anesthesia.The aim of this study is to observe ANI under combined spinal epidural anesthesia.