Propofol/Remifentanil Anesthesia Might Not Alter the Middle Cerebral Artery Diameter by Digital Subtraction Angiography
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Transcranial Doppler (TCD) of the middle cerebral artery (MCA) enables the measurement of the mean blood velocity (MCAVm) and the estimation of the cerebral blood flow (CBF), provided that no significant changes occur in the MCA diameter (MCADiam). Previous studies described a decrease in the MCAVm associated with the induction of total intravenous anesthesia (TIVA) by propofol and remifentanil. This decrease in blood velocity might be interpreted as a decrease in the CBF only where the MCADiam is not modified across TCD examinations.
In this observational study, we measured the MCADiam of 24 subjects (almost exclusively females) on digital subtraction angiography under awake and TIVA conditions.
Across the two phases, we observed a decrease in the mean arterial blood pressure (from 84 ± 9 to 71 ± 6 mmHg; p < 0.001) and heart rate (76 ± 10 vs. 65 ± 8 beats/min; p < 0.001), and a concomitant decrease in the MCAVm (61 vs. 42 cm/s; p < 0.001). In contrast, the MCADiam did not vary in association with TIVA (2.3 ± 0.2 vs. 2.3 ± 0.2 mm; p = 0.52).
Those results suggested that in this population, no significant changes in the MCADiam are associated with TIVA.
KeywordsCerebral blood flow Digital subtraction angiography Middle cerebral artery General anesthesia Transcranial Doppler
SAM contributed to original idea, patients’ recruitment, data collection, arterial diameter measurements, statistic analysis, and manuscript writing. NE contributed to original idea, study design, and manuscript writing. VC performed neuroradiological procedures, venous pressure and arterial diameters measurements, and critical revision. JM contributed to critical revision. MAL performed neuroradiological procedures and venous pressure measurements and critical revision. JPSM performed neuroradiological procedures and pressure measurements and critical revision. AM contributed to critical revision and project supervision. EG contributed to critical revision and project supervision. EH performed neuroradiological procedures and pressure measurements and critical revision. FV contributed to original idea, study design and direction, and manuscript writing.
Source of support
This research received no specific grant from any funding agency in the public, commercial, or non-profit sectors.
Conflict of interest
The author declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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