Effect of Head Rotation on Cerebral Blood Velocity in the Prone Position

Autor: Jakob Højlund, Marie Sandmand, Morten Sonne, Teit Mantoni, Henrik L. Jørgensen, Bo Belhage, Johannes J. van Lieshout, Frank C. Pott
Jazyk: angličtina
Rok vydání: 2012
Předmět:
Zdroj: Anesthesiology Research and Practice, Vol 2012 (2012)
Druh dokumentu: article
ISSN: 1687-6962
1687-6970
DOI: 10.1155/2012/647258
Popis: Background. The prone position is applied to facilitate surgery of the back and to improve oxygenation in the respirator-treated patient. In particular, with positive pressure ventilation the prone position reduces venous return to the heart and in turn cardiac output (CO) with consequences for cerebral blood flow. We tested in healthy subjects the hypothesis that rotating the head in the prone position reduces cerebral blood flow. Methods. Mean arterial blood pressure (MAP), stroke volume (SV), and CO were determined, together with the middle cerebral artery mean blood velocity (MCA Vmean) and jugular vein diameters bilaterally in 22 healthy subjects in the prone position with the head centered, respectively, rotated sideways, with and without positive pressure breathing (10 cmH2O). Results. The prone position reduced SV (by 5.4±1.5%; P
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