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Purpose: Psychosocial disorders have been linked to chronic postoperative opioid use and the development of postoperative pain. The potential interaction between sex and psychosocial factors with respect to opioid use after elective spine surgery in the elderly has not yet been evaluated. Our aim was to assess whether any observed association of anxiety or depression indicators with opioid consumption in the first 72 hours after elective spine surgery varies by sex in adults ≥ 65 years.Patients and Methods: Secondary analysis of a retrospective cohort of 647 elective spine surgeries performed at Brigham and Women's Hospital, July 1, 2015–March 15, 2017, in patients ≥ 65. Linear mixed-effects models were used to test whether history of anxiety, anxiolytic use, history of depression, and antidepressant use were associated with opioid consumption 0– 24, 24– 48, and 48– 72 post surgery, and whether these potential associations differed by sex.Results: History of anxiety, anxiolytic use, history of depression, and antidepressant use were more common among women (51.3% of the sample). During the first 24 hours after surgery, men with a preoperative history of anxiety consumed an adjusted mean of 19.5 morphine milligram equivalents (MME) (99.6% CI: 8.1, 31.0) more than men without a history of anxiety; women with a history of anxiety only consumed an adjusted mean 2.9 MME (99.6% CI: − 3.1, 8.9) more than women without a history of anxiety (P value for interaction between sex and history of anxiety < 0.001). No other interactions were detected between sex and psychosocial factors with respect to opioid use after surgery.Conclusion: Secondary analysis of this retrospective cohort study found minimal evidence that the association between psychosocial factors and opioid consumption after elective spine surgery differs by sex in adults ≥ 65. [ABSTRACT FROM AUTHOR]

Analgesia Nociception Index monitor provides a measurement of the nociception and anti-nociception balance based on heart-rate variability. The aim was to assess the ability of Analgesia Nociception Index (ANI) to detect standard noxious stimulation during anesthesia at different opioid concentrations in comparison to hemodynamic and Bispectral Index parameters. Sixteen patients undergoing general anesthesia with propofol and remifentanil. Standardized tetanic electrical stimulation was applied without any other concurrent stimuli, while different effect site concentrations of remifentanil were increased step-by-step (0.5, 1.5, 3.0, 5 and 7 ng/ml). For each tetanic stimulus, values of the different variables 60 s before and 120 s following the stimulus were analyzed. ANI values decreased significantly 120 s after the stimulus when compared to the mean ANI 60 s before the stimulus (P < 0.01). At lower remifentanil concentrations (0.5 ng/ml), all variables except electromyogram from the Bispectral Index significantly changed after the stimulus but in the higher concentrations (5.0 and 7.0 ng/ml) there was not a significant change. The other variables did not change significantly after the noxious stimulation. ANI was the only variable that positively correlated with the different remifentanil concentrations (R = 0.959, P = 0.01). Our study showed that there was a significant decrease in Analgesia Nociception Index after a tetanic stimulation while hemodynamic and BIS parameters did not change, suggesting that the Analgesia Nociception Index may perform better than traditional hemodynamic parameters at reflecting noxious stimulation. Analgesia Nociception Index significantly changed at lower, but not at higher, remifentanil concentrations. [ABSTRACT FROM AUTHOR]