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Isoflurane anesthetic hypersensitivity and progressive respiratory depression in a mouse model with isolated mitochondrial complex I deficiency

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Abstract

Background

Children with mitochondrial disorders are frequently anesthetized for a wide range of operations. These disorders may interfere with the response to surgery and anesthesia. We examined anesthetic sensitivity to and respiratory effects of isoflurane in the Ndufs4 knockout (KO) mouse model. These mice exhibit an isolated mitochondrial complex I (CI) deficiency of the respiratory chain, and they also display clinical signs and symptoms resembling those of patients with mitochondrial CI disease.

Methods

We investigated seven Ndufs4−/− knockout (KO), five Ndufs4+/− heterozygous (HZ) and five Ndufs4+/+ wild type (WT) mice between 22 and 25 days and again between 31 and 34 days post-natal. Animals were placed inside an airtight box, breathing spontaneously while isoflurane was administered in increasing concentrations. Minimum alveolar concentration (MAC) was determined with the bracketing study design, using the response to electrical stimulation to the hind paw.

Results

MAC for isoflurane was significantly lower in KO mice than in HZ and WT mice: 0.81 % ± 0.01 vs 1.55 ± 0.05 % and 1.55 ± 0.13 %, respectively, at 22–25 days, and 0.65 ± 0.05 %, 1.65 ± 0.08 % and 1.68 ± 0.08 % at 31–34 days. The KO mice showed severe respiratory depression at lower isoflurane concentrations than the WT and HZ mice.

Conclusion

We observed an increased isoflurane anesthetic sensitivity and severe respiratory depression in the KO mice. The respiratory depression during anesthesia was strongly progressive with age. Since the pathophysiological consequences from complex I deficiency are mainly reflected in the central nervous system and our mouse model involves progressive encephalopathy, further investigation of isoflurane effects on brain mitochondrial function is warranted.

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Acknowledgements

We are grateful for the help of Francien van de Pol, Ing., and Ilona van den Brink, Ing. (laboratory technicians, Department of Anesthesiology, Radboud University Medical Centre, Nijmegen, the Netherlands) for their technical assistance in performing the animal experiments. Funding was provided solely from institutional and/or departmental sources.

Conflict of interests

J Smeitink is CEO of Khondrion, a spin-off company of the Radboud University Medical Centre, Nijmegen, The Netherlands.

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Correspondence to Jacques J. Driessen.

Additional information

S. Roelofs and G. R. Manjeri contributed equally.

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Roelofs, S., Manjeri, G.R., Willems, P.H. et al. Isoflurane anesthetic hypersensitivity and progressive respiratory depression in a mouse model with isolated mitochondrial complex I deficiency. J Anesth 28, 807–814 (2014). https://doi.org/10.1007/s00540-014-1791-0

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  • DOI: https://doi.org/10.1007/s00540-014-1791-0

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