Click the blue text above to follow us Click the above “Voice of Miller” → Click the upper right corner“…” → Select “Set as Starred “★ “ to star Voice of Miller, making it easier for you to find us in the future! 【Definition】 The Surgical Pleth Index (surgical pleth index, SPI) is a monitoring … Read more
（长按 识别二维码 搜索更多麻醉学知识点） 【Definition】 The Surgical Pleth Index (SPI) is a monitoring tool that measures the photoplethysmographic signal from the fingertip to monitor the nociception-anti-nociception balance during general anesthesia. 【Principle】 Stress stimuli activate the peripheral sympathetic nervous system, inducing distal vascular contraction. By measuring the absorption of red light from the fingertip, the photoplethysmographic pulse … Read more