Evaluation of remifentanil anesthesia for off-pump coronary artery bypass grafting surgery using heart rate variability

Shu,Aihua; Zhan,Leyun; Fang,Haibin; Lv,En; Chen,Xiaobo; Zhang,Mingyu; Wang,Qiang

doi:10.3892/etm.2013.1108

Evaluation of remifentanil anesthesia for off-pump coronary artery bypass grafting surgery using heart rate variability

Authors:
- Aihua Shu
- Leyun Zhan
- Haibin Fang
- En Lv
- Xiaobo Chen
- Mingyu Zhang
- Qiang Wang
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Affiliations: Department of Anesthesiology, Three Gorges University People's Hospital, Yichang, Hubei 443000, P.R. China
Published online on: May 10, 2013 https://doi.org/10.3892/etm.2013.1108
Pages: 253-259

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Abstract

Heart rate variability (HRV) was used in the present study to evaluate a target‑controlled approach compared with a constant‑rate infusion for remifentanil anesthesia during off‑pump coronary artery bypass grafting (OP‑CABG) surgery. A total of 65 patients with American Society of Anesthesiologists (ASA) physical status II or III, who were aged 60‑85 years and scheduled for OP‑CABG, were selected for the study. All patients were administered an intramuscular premedication of 10 mg morphine and 0.3 mg scopolamine. In group I, remifentanil was infused using a target‑controlled approach at 1.5‑5.0 ng/ml, and in group II, remifentanil was infused at a constant‑rate of 0.05‑1.0 µg/kg/min and at additional single increments of 1 µg/kg when appropriate. The heart rate and other hemodynamic monitoring indices of the patients, including the mean arterial pressure, central venous pressure, pulmonary artery pressure and pulmonary capillary wedge pressure, were monitored at various time points, including prior to induction (T0), at extubation (performed intraoperatively; T7) and at 24 h post‑surgery. The HRV indices, including total power (TP), low frequency (LF) and the LF/high frequency (HF) ratio of power (LF/HF), were reduced following induction at T0 and remained low at 24 h post‑surgery. At T5 (right coronary or left circumflex artery anastomosis) and T7 (tracheal extubation), all the HRV indices, with the exception of the HF power, were significantly increased (P<0.05). Additionally, the TP, LF and LF/HF values in group II were higher at T5 compared with those in group I (P<0.05). Remifentanil target‑controlled infusion is superior to constant‑rate infusion in suppressing the stress response during OP‑CABG, maintaining the balance of the cardiac autonomic nervous system and promoting the recovery of the autonomic function following surgery.

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