Hemorrhage increases the effect of propofol and could contribute to false-positive transcranial motor-evoked potential (TcMEP) responses under total intravenous anesthesia (TIVA). We investigated the influence of hemorrhage and subsequent fluid resuscitation on TcMEPs under desflurane anesthesia.
Sixteen swine (25.4 ± 0.4 kg) were anesthetized with a 4% end-tidal desflurane concentration (EtDes), which was incrementally increased to 6%, 8%, and 10% and then returned to 4% every 15 min. This procedure was repeated twice (baseline). After baseline measurements, animals were allocated to either the hemorrhage (n = 12) or control (n = 4) group. In the hemorrhage group, 600 ml of blood was removed and the EtDes protocol described above was applied. Hypovolemia was resuscitated using 600 ml of hydroxyethyl starch and the EtDes protocol was applied again. TcMEPs were measured at each EtDes. In the control group, measurements were performed without hemorrhage or fluid infusion.
TcMEP responses were observed in all conditions in all limbs with 4% EtDes (0.4 MAC). TcMEP amplitudes decreased according to the EtDes to a greater degree in the lower limbs compared with the upper limbs. Hemorrhage enhanced the effect of desflurane on TcMEP amplitudes, and decreased TcMEP by 41 ± 12% in upper limbs and 63 ± 17% in lower limbs compared with baseline. Subsequent fluid resuscitation did not reverse TcMEP amplitudes.
TcMEP amplitudes decrease during hemorrhage under desflurane anesthesia. This phenomenon might result from an enhanced effect of desflurane on the spinal motor pathway without increasing the desflurane concentration.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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We thank Emily Woodhouse, PhD, from Edanz Group (https://en-author-services.edanzgroup.com/ac) for editing a draft of this manuscript.
Support was received solely from institutional and/or departmental sources.
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The authors have no conflicts of interest to declare.
Human and Animal rights
This study was approved by the Committee of the Animal Research Division at Hamamatsu University School of Medicine (approval number 2019052).
All procedures performed in studies involving animals were in accordance with the ethical standards of the institution at which the studies were conducted (The Committee of the Animal Research Division at Hamamatsu University School of Medicine, approval number 2019052). This article does not contain any studies with human participants performed by any of the authors.
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Kurita, T., Kawashima, S., Ibrahim Khaleelullah, M.M.S. et al. Influence of hemorrhage and subsequent fluid resuscitation on transcranial motor-evoked potentials under desflurane anesthesia in a swine model. J Clin Monit Comput (2021). https://doi.org/10.1007/s10877-020-00644-2
- Motor evoked potentials
- Spinal cord