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Journal of Clinical Monitoring and Computing

, Volume 30, Issue 6, pp 977–984 | Cite as

Prediction of hemodynamic reactivity using dynamic variations of Analgesia/Nociception Index (∆ANI)

  • E. Boselli
  • R. Logier
  • L. Bouvet
  • B. Allaouchiche
Original Research

Abstract

The Analgesia/Nociception Index (ANI), a 0–100 non-invasive index calculated from heart rate variability, reflects the analgesia/nociception balance during general anesthesia. We hypothesized that dynamic variations of ANI (∆ANI) would provide better performance than static values to predict hemodynamic reactivity during desflurane/remifentanil general anesthesia. One hundred and twenty-eight patients undergoing ear–nose–throat or lower limb orthopedic surgery were analyzed in this prospective observational study. The ANI, heart rate and systolic blood pressure were recorded before induction, at skin incision, during procedure and at emergence from general anesthesia. Changes in these variables were recorded after 1 min for ANI (ANI1min) and 5 min for heart rate and systolic blood pressure. The dynamic variation of ANI at the different time points was defined as: ∆ANI = (ANI1min − ANI)/([ANI + ANI1min]/2). Receiver-operating characteristic (ROC) curves were built to evaluate the performance of ANI, ANI1 min and ∆ANI to predict hemodynamic reactivity (increase by more than 20 % in heart rate and/or systolic blood pressure within 5 min). For the prediction of hemodynamic reactivity, better performance was observed with ∆ANI (area under ROC curve (AUC ROC) = 0.90) in comparison to ANI (ROC AUC = 0.50) and ANI1min (ROC AUC = 0.77). A ∆ANI threshold of −19 % predicts hemodynamic reactivity with 85 % [95 % CI 77–91] sensitivity and 85 % [95 % CI 81–89] specificity. Dynamic variations of ANI provide better performance than static values to predict hemodynamic reactivity during desflurane/remifentanil general anesthesia. These findings may be of interest for the individual adaptation of remifentanil doses guided by ∆ANI during general anesthesia, although this remains to be demonstrated.

Keywords

Monitoring Intraoperative Analgesia Remifentanil 

Notes

Acknowledgments

The authors whish to thank Mrs Sandrine Fortuné and Mrs Emmanuelle Teyssier (anesthetic nurses from the Hospices Civils de Lyon performing their training course in research at the time of the study) for their participation in the study data collection and analysis.

Authors’ contributions

Emmanuel Boselli designed and conducted the study, performed data collection and prepared the manuscript. Régis Logier, Lionel Bouvet and Bernard Allaouchiche helped design the study and revised the manuscript. All authors approved the final version of the manuscript.

Funding

This study was funded by institutional sources only.

Compliance with ethical standards

Conflict of interest

Emmanuel Boselli has received travel grants for conference presentations and honoraria for speaking at symposia from MDoloris Medical Systems. Régis Logier is consultant for MDoloris Medical Systems. The other authors have no conflict of interest to disclose.

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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  1. 1.Department of Anesthesiology and Intensive Care, Édouard Herriot Hospital, Service d’anesthésie-réanimation, Hospices Civils de LyonClaude Bernard Lyon I University, University of LyonLyonFrance
  2. 2.CIC-IT INSERM 1403University Hospital of Lille, Lille 2 UniversityLilleFrance

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