Cerebral blood flow is not affected during perfluorocarbon dosing with volume-controlled ventilation

Authors

  • Mark W Davies,

    Corresponding author
    1. Grantley Stable Neonatal Unit, Royal Brisbane and Women's Hospital, Brisbane, Queensland, Australia
    2. Department of Paediatrics and Child Health, The University of Queensland, Brisbane, Queensland, Australia
    3. Perinatal Research Centre, The University of Queensland, Royal Brisbane and Women's Hospital, Brisbane, Queensland, Australia
    • Correspondence: Dr Mark Davies, Department of Neonatology, Royal Brisbane and Women's Hospital, Herston, Qld. 4029, Australia. Fax: +61 73636 5259; email: mark_davies@health.qld.gov.au

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  • Kimble R Dunster,

    1. Grantley Stable Neonatal Unit, Royal Brisbane and Women's Hospital, Brisbane, Queensland, Australia
    2. Medical Engineering Research Facility, Queensland University of Technology, Brisbane, Queensland, Australia
    3. Critical Care Research Group, Department of Intensive Care Medicine, The Prince Charles Hospital, Brisbane, Queensland, Australia
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  • John F Fraser,

    1. Critical Care Research Group, Department of Intensive Care Medicine, The Prince Charles Hospital, Brisbane, Queensland, Australia
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  • Paul B Colditz

    1. Perinatal Research Centre, The University of Queensland, Royal Brisbane and Women's Hospital, Brisbane, Queensland, Australia
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  • Conflict of interest: None declared.
  • Authors contributions: MWD conceived and designed the study; PBC and KRD contributed to the design; MWD, KRD and JFF contributed to the non-routine technical work in the animal laboratory; MWD did all data analyses; PBC, KRD and JFF contributed to analysis and interpretation the data; MWD wrote the manuscript; PBC, KRD and JFF critically revised the manuscript so as to contribute to the interpretation. All authors read and approved the final manuscript.

Abstract

Aims

Perfluorocarbon administration increases cerebral blood flow. This can be mitigated by preventing a rise in carbon dioxide by adjusting pressure-controlled ventilation. Volume-controlled ventilation should prevent increases in arterial carbon dioxide and cerebral blood flow. This study aims to determine if cerebral blood flow is increased during administration of 10 mL/kg of perfluorocarbon while using volume-controlled ventilation.

Methods

Two New Zealand white rabbits, ventilated with volume-control, were each allocated to six dosing events where each dosing event was randomly allocated to one of two dosing strategies: a control group – given a sham dose of air (10 mL/kg) over 20 min; or a partial liquid ventilation group – given 10 mL/kg FC-77 slowly over 20 min. Data were recorded for 1 min before and 30 min after the start of each dosing event. No adjustment of ventilation (except fraction of inspired oxygen) was allowed during each dosing event.

Results

There were no significant changes over time and no differences between groups for carotid blood flow (P = 0.48 at the end of the dose). There were slight increases in cortical cerebral blood flow in both groups; there was no statistically significant difference between groups (P = 0.56 at end dose and P = 0.49 at time of maximum difference). There was no difference between groups for the variability in carotid blood flow or cortical cerebral blood flow.

Conclusions

Cerebral blood flow was not significantly increased during administration of a dose of 10 mL/kg of perfluorocarbon during commencement of partial liquid ventilation when using volume-controlled ventilation.

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