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Harry B. Kram, MD; William C. Shoemaker, MD; Nancy Bratanow, MD; Paul L. Appel, MPA; Rosalyn P. Sterling, MD; Arthur W. Fleming, MD

Arch Surg. 1986;121(8):914-917.

Abstract
• Conjunctival oxygen tension (Pcjo₂) was measured continuously during carotid endarterectomy in 15 patients to evaluate its sensitivity in patients receiving shunts. These studies suggest that Pcjo₂ tracks brain perfusion during periods of carotid artery occlusion. Reduced Pcjo₂ was clearly demonstrated with systemic hypotension, carotid artery clamping, and carotid shunt obstruction and clamping. Monitoring of Pcjo₂ is noninvasive, easy to perform, offers no danger to the patient, and allows real-time assessment of the local tissue perfusion. It provides valuable information on the effectiveness of carotid oxygen transport and, in conjunction with arterial blood gas values, expresses carotid artery perfusion relative to systemic oxygen transport. Further investigations using the Pcjo₂ sensor may define criteria for intraoperative carotid arterial shunting in patients with tenuous cerebral perfusion, and for prompt intervention in patients with deteriorating perfusion prior to the onset of life-threatening cerebral ischemia.

(Arch Surg 1986;121:914-917)

Author Affiliations
From the Martin Luther King Jr—Charles R. Drew Postgraduate Medical School of UCLA (Drs Kram, Sterling, and Fleming) and the Department of Surgery, Los Angeles County—Harbor-UCLA Medical Center, Torrance, Calif (Drs Shoemaker and Bratanow and Mr Appel).

Footnotes
Accepted for publication Oct 4, 1985.

Read before the Annual Meeting of the Southern California Chapter of the American College of Surgeons, Coronado, Calif, Jan 19, 1985.

Reprint requests to 1000 W Carson St, Torrance, CA 90509 (Dr Shoemaker).

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ABSTRACT