• Eur J Anaesthesiol · Oct 2012

    Transcranial Doppler sonography as a potential screening tool for preanaesthetic evaluation: a prospective observational study.

    • Axel Fudickar, Joern Leiendecker, Anna Köhling, Juergen Hedderich, Markus Steinfath, and Berthold Bein.
    • Department of Anaesthesiology and Intensive Care Medicine, University Hospital Schleswig-Holstein, Campus Kiel, Schwanenweg, Germany. axel.fudickar@uksh.de
    • Eur J Anaesthesiol. 2012 Oct 1;29(10):471-6.

    ContextIntraoperative cervical spine rotation may compromise cerebral blood flow in susceptible individuals by distortion of cervical arteries.ObjectiveTo investigate the effect of five cervical spine positions on cerebral blood flow in the middle cerebral artery.DesignProspective observational study.SettingUniversity hospital.PatientsFifty-six male and 24 female patients scheduled for general anaesthesia for routine surgery. Exclusion criteria were cranial spine pathology and cerebral vascular disease.InterventionsMaximum rotation of the head to the left and right side with and without hyperextension, and hyperextension in the neutral position.Main Outcome MeasuresChange of mean blood flow velocity in the middle cerebral artery measured by transcranial Doppler sonography.ResultsAge had a significant effect on mean blood flow velocity in the left middle cerebral artery in the neutral position (P = 0.047). There was a significant difference in mean blood flow velocity in the left middle cerebral artery between patients younger than 40 years and patients older than 59 years [61.2 (16.6) ml min(-1) vs. 47.7 (16.2) ml min(-1); P = 0.015]. There was a significant effect of head position on mean blood flow velocity in both the left and in the right middle cerebral arteries (P = 0.039 left, P = 0.025 right). Twenty patients had a decrease of more than 20% from their baseline mean blood flow velocity.ConclusionNeck rotation and/or extension resulted in a significant change of blood flow in the middle cerebral artery.

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