Abstract
In recent years, a variety of surgically-induced nociceptive monitoring systems have been proposed to maintain optimal analgesic balance. Surgical pleth index(SPI) is a monitoring tool obtained from finger photo plethysmography signals used to detect the balance between nociceptive and analgesic administration during general anesthesia. In this review, we summarized the application of SPI monitoring in clinical anesthesia in recent years. SPI monitoring improved the judgment of nociceptive sensation in anesthesia and provided reference for the analgesic level of anesthesia. Key words: Anesthesia; Monitoring; Surgical pleth index; Analgesia
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