The contribution of extracranial blood oxygenation on near‐infrared spectroscopy during carotid thrombendarterectomy

To determine the contribution of extracranial oxygenation on regional cerebral oxygenation measured by an Invos 3100 near‐infrared spectrometer, we measured oxygenation in blood drawn from both the facial vein (draining substantially blood from forehead areas) and the jugular venous bulb. There was...

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Bibliographic Details
Published in:	Anaesthesia Vol. 52; no. 2; pp. 116 - 120
Main Authors:	Grubhofer, G., Lassnigg, A., Manlik, F., Marx, E., Trubel, W., Hiesmayr, M.
Format:	Journal Article
Language:	English
Published:	Oxford Blackwell Science Ltd 01-02-1997 Blackwell
Subjects:	Adult Aged Aged, 80 and over Biological and medical sciences Brain - metabolism carotid Endarterectomy, Carotid Face - blood supply Female Humans Jugular Veins Male Measurement techniques Medical sciences Middle Aged Monitoring, Intraoperative near‐infrared. Surgery Oxygen - blood Regional Blood Flow spectroscopy Spectroscopy, Near-Infrared Surgery (general aspects). Transplantations, organ and tissue grafts. Graft diseases vascular Vascular surgery: aorta, extremities, vena cava. Surgery of the lymphatic vessels Human Oxygen Cardiovascular disease Extracranial Arterial disease Near infrared spectrometry Surgery Carotid Gas saturation Hemodynamics Measurement method Oxygenation Endarteriectomy Monitoring Brain (vertebrata)
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Summary:	To determine the contribution of extracranial oxygenation on regional cerebral oxygenation measured by an Invos 3100 near‐infrared spectrometer, we measured oxygenation in blood drawn from both the facial vein (draining substantially blood from forehead areas) and the jugular venous bulb. There was no correlation between regional cerebral oxygenation and facial vein oxygenation (p = 0.35) but there was a significant correlation between regional cerebral oxygenation and jugular venous bulb oxygenation (p = 0.027). Linear regression analysis predicted a 3.6% change in regional oxygenation for every 10% change in jugular venous bulb oxygenation. We showed that extracranial tissue oxygenation had a negligible influence on the values recorded using near‐infrared spectroscopy. Individual changes in jugular venous bulb oxygenation were poorly reflected. Data obtained by this near‐infrared spectroscopy device are an unreliable guide to the adequacy of cerebral oxygenation.
ISSN:	0003-2409 1365-2044
DOI:	10.1111/j.1365-2044.1997.20-az020.x