The Clinical journal of pain
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Variations of the Analgesia Nociception Index During Propofol Anesthesia for Total Knee Replacement.
The Analgesia Nociception Index (ANI) monitor measures the relative parasympathetic tone as a surrogate for the antinociception/nociception balance during general anesthesia. The aims of this observational study were to test whether ANI could early detect hemodynamic reactivity (HemodR) during propofol anesthesia, measure pain in conscious patients after surgery, and determine ANI predictive thresholds. ⋯ ANI measures during propofol anesthesia are coherent with the evolution of the analgesia/nociception balance, although its performance decreases in awake patients. Further clinical validation should focus on demonstrating the benefit of maintaining ANI over 63 during surgery.
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Pain is a complex common health problem, with important implications for quality of life and with huge economic consequences. Pain can be elicited due to tissue damage, as well as other multiple factors such as inflammation and oxidative stress. Can there be 1 therapeutic pathway that may target multiple etiologic factors in pain? ⋯ In this article, we show evidence for the relationships between vagal nerve activity and pain, and between vagal nerve activity and 5 factors that are etiologic to pain. Given the evidence and effects of the vagus nerve activation in pain, people involved in pain therapy may need to seriously consider activation of this nerve.