Preoperative ultra short-term entropy predicts arterial blood pressure fluctuation during the induction of anesthesia

Yoshihiro Fujiwara, Hiroshi Ito, Yusuke Asakura, Yuko Sato, Kimitoshi Nishiwaki, Toru Komatsu

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

BACKGROUND: In this study, we sought to determine whether the preoperative nonlinear index of heart rate variability, ultra short-term entropy (UsEn), could predict cardiovascular responses to the induction of general anesthesia. METHODS: UsEn was estimated by a linearized version of the nonlinear least squares method combined with the maximum entropy spectral analysis method (MemCalc method). Preoperative UsEn of 46 patients (ASA PS 1 or 2, aged 40-60 yr) without a history of hypertension was evaluated using the MemCalc method. Patients were assigned to two groups according to preoperative UsEn (Group LOW; UsEn <45, Group HIGH; UsEn ≥45). Anesthesia was induced with propofol, fentanyl and vecuronium bromide and endotracheal intubation was performed. Hemodynamic fluctuations during the induction of anesthesia were recorded and compared between the two groups. RESULTS: It was found that arterial blood pressure fluctuations during the induction of anesthesia were significantly greater in patients with a low UsEn. CONCLUSION: UsEn could predict arterial blood pressure fluctuations during the induction of anesthesia.

Original languageEnglish
Pages (from-to)853-856
Number of pages4
JournalAnesthesia and Analgesia
Volume104
Issue number4
DOIs
Publication statusPublished - 04-2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Anesthesiology and Pain Medicine

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