• Annemarie Akkermans, van WaesJudith A RJARDepartment of Anaesthesiology, University Medical Centre Utrecht, Utrecht University, Utrecht, the Netherlands., van DoormaalTristan P CTPCDepartment of Neurology and Neurosurgery, Brain Centre, University Medical Centre Utrecht, Utrecht University, Utrecht, the Netherlands; Department of Neurosurgery, University Hospital Zürich, Zurich, Switzerland., de WaalEric E CEECDepartment of Anaesthesiology, University Medical Centre Utrecht, Utrecht University, Utrecht, the Netherlands., RinkelGabriël J EGJEDepartment of Neurology and Neurosurgery, Brain Centre, University Medical Centre Utrecht, Utrecht University, Utrecht, the Netherlands., Albert van der Zwan, Cor J Kalkman, and Wilton A van Klei.
• Department of Anaesthesiology, University Medical Centre Utrecht, Utrecht University, Utrecht, the Netherlands. Electronic address: a.akkermans@umcutrecht.nl.
• Br J Anaesth. 2020 Oct 1; 125 (4): 539-547.

BackgroundPatients undergoing cerebral bypass surgery are prone to cerebral hypoperfusion. Currently, arterial blood pressure is often increased with vasopressors to prevent cerebral ischaemia. However, this might cause vasoconstriction of the graft and cerebral vasculature and decrease perfusion. We hypothesised that cardiac output, rather than arterial blood pressure, is essential for adequate perfusion and aimed to determine whether dobutamine administration resulted in greater graft perfusion than phenylephrine administration.MethodsThis randomised crossover study included 10 adult patients undergoing cerebral bypass surgery. Intraoperatively, patients randomly and sequentially received dobutamine to increase cardiac index or phenylephrine to increase mean arterial pressure (MAP). An increase of >10% in cardiac index or >10% in MAP was targeted, respectively. Before both interventions, a reference phase was implemented. The primary outcome was the absolute difference in graft flow between the reference and intervention phase. We compared the absolute flow difference between each intervention and constructed a random-effect linear regression model to explore treatment and carry-over effects.ResultsGraft flow increased with a median of 4.1 (inter-quartile range [IQR], 1.7-12.0] ml min-1) after dobutamine administration and 3.6 [IQR, 1.3-7.8] ml min-1 after phenylephrine administration (difference -0.6 ml min-1; 95% confidence interval [CI], -14.5 to 5.3; P=0.441). There was no treatment effect (0.9 ml min-1; 95% CI, 0.0-20.1; P=0.944) and no carry-over effect.ConclusionsBoth dobutamine and phenylephrine increased graft flow during cerebral bypass surgery, without a preference for one method over the other.Clinical Trial RegistrationNetherlands Trial Register, NL7077 (https://www.trialregister.nl/trial/7077).Copyright © 2020 The Author(s). Published by Elsevier Ltd.. All rights reserved.

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