Abstract

In the resection of tumors infiltrating near the superior vena cava (SVC), the SVC can be occluded unintentionally by surgical manipulations. Because an SVC obstruction results in cerebral ischemia and >45 minutes of an SVC occlusion cannot be tolerated in humans,1 the lack of awareness of an SVC obstruction can lead to serious neurologic complications. The monitoring of pressure in the external or internal jugular vein is a sensitive indicator of an SVC obstruction. However, it is difficult to know the critical level that indicates impaired cerebral perfusion in patients.

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