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Title: PaCO2 measurement in cerebral haemodynamics: face mask or nasal cannulae?
Authors: Minhas, J. S.
Robinson, Thompson Gordon
Panerai, R.
First Published: 22-Jun-2017
Publisher: IOP Publishing
Citation: Physiological Measurement, 2017, 38 (7), pp. N101-N106
Abstract: OBJECTIVE: PaCO2 affects cerebral blood flow (CBF) and its regulatory mechanisms, but the effects of CO2 measurement technique on cerebrovascular parameters are unknown. In order to determine if the two most commonly used approaches, face mask (FM) or nasal cannulae (NC), are interchangeable or not, we tested the hypothesis that the use of FM versus NC does not lead to significant differences in CO2-related systemic and cerebrovascular parameters. APPROACH: Recordings of CBF velocity (CBFV), blood pressure (BP), heart rate, and end-tidal CO2 (EtCO2) were performed in 42 subjects during normocapnia (FM or NC) and 5% CO2 inhalation (FM) or hyperventilation (NC). Dynamic cerebral autoregulation was assessed with the autoregulation index (ARI), derived by transfer function analysis from the CBFV response to a hypothetical step change in BP. MAIN RESULTS: Significant differences in physiological parameters were seen between FM and NC: EtCO2 (37.40 versus 35.26 mmHg, p  =  0.001) and heart rate (69.6 versus 66.7 bpm, p  =  0.001) respectively. No differences were observed for mean BP, CBFV or the ARI index. SIGNIFICANCE: Use of FM or NC for measurement of EtCO2 leads to physiological changes and differences in parameter values that need to be taken into consideration when interpreting and/or comparing results in studies of cerebral haemodynamics.
DOI Link: 10.1088/1361-6579/aa6f9f
ISSN: 0967-3334
eISSN: 1361-6579
Version: Post-print
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2017 Institute of Physics and Engineering in Medicine. Deposited with reference to the publisher’s open access archiving policy.
Description: The file associated with this record is under embargo until 12 months after publication, in accordance with the publisher's self-archiving policy. The full text may be available through the publisher links provided above.
Appears in Collections:Published Articles, Dept. of Cardiovascular Sciences

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