• Edyta Kotlinska-Hasiec, Marek Czajkowski, Ziemowit Rzecki, Adam Stadnik, Krysztof Olszewski, Beata Rybojad, and Wojciech Dabrowski.
• Department of Anaesthesiology Intensive Therapy, Medical University of Lublin, Lublin, Poland.
• J. Cardiothorac. Vasc. Anesth.. 2014 Apr 1;28(2):328-35.

ObjectiveDisturbances in venous outflow from the cerebral circulation may result in brain injury. Severe increases in brain venous pressure lead to brain ischemia and, subsequently, brain edema and intracranial hemorrhages. The purpose of this study was to determine the effect of changes in jugular venous bulb pressure (JVBP) on plasma blood brain-barrier biomarkers concentration and disturbances in arteriovenous total and ionized magnesium (a-vtMg and a-viMg) in brain circulation in patients undergoing coronary artery bypass grafting surgery (CABG) with cardiopulmonary bypass (CPB).DesignProspective observational study.SettingDepartment of Cardiac Surgery at a Medical University Hospital.ParticipantsNinety-two adult patients undergoing elective CABG with CPB under general anaesthesia were studied.MethodsCentral venous pressure (CVP) was measured using a pulmonary artery catheter. The right jugular vein was cannulized retrogradely for jugular venous bulb pressure (JVBP) measurement. Concentrations of plasma S100β protein, matrix metalloproteinase 9 (MMP-9), creatine kinase isoenzyme BB (CK-BB) a-vtMg and a-viMg were measured as the markers of blood-brain barrier dysfunction. All of them were analyzed in comparison with JVBP during surgery and the early postoperative period.ResultsElevated JVBP was noted after CPB and after surgery. Its increase above 12 mmHg intensified release of S100β, MMP-9 and CK-BB as well as disorders in a-vtMg and a-viMg. CVP correlated with JVBP, S100β, and MMP-9. Moreover, JVBP correlated with S100β and MMP-9.ConclusionsCardiac surgery increased JVBP, and JVBP elevated above 12 mmHg intensified an increase in biomarkers of plasma blood-brain barrier disruption.Copyright © 2014 Elsevier Inc. All rights reserved.

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