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Canadian Journal of Anesthesia, Vol 15, 593-602, Copyright © 1968 by Canadian Anesthesiologists' Society

Right Atrial Oxygen Levels During Anaesthesia and Surgery

EDUARDO GARCIA M.D.1, JOHN D. MICHENFELDER M.D.2, and RICHARD A. THEYE M.D.2

1 Resident in Anesthesiology in the Mayo Graduate School of Medicine, University of Minnesota, Rochester
2 Section of Anesthesiology, Mayo Clinic and Mayo Foundation

Right atrial oxygen saturation was measured in 32 patients undergoing a variety of neurosurgical procedures. Initial efforts to sample mixed venous blood from the pulmonary artery resulted in a high incidence of ventricular tachycardia. For this reason, catheters were inserted only as far as the right atrium and were positioned by electrocardiographic means. Catheterization was easily accomplished and required a minimum of time and technical experience.

In the presence of normal haemodynamics and pulmonary function, right atrial oxygen saturations were steady and within normal limits. Changes in cardiac output secondary to haemorrhage, transfusion, urea infusion, and air embolus were reflected by early changes in right atrial oxygen saturations with or without concomitant changes in arterial pressure, venous pressure, and heart rate. Changes in arterial oxygen content secondary to shunting or decreased haemoglobin concentration were reflected in the right atrial oxygen saturations with or without concomitant changes in the other monitored variables. The monitoring of right atrial oxygen saturations provides useful additional information which contributes to proper evaluation and management of the anaesthetized patient.

Note:

Presented at the Annual Meeting, Canadian Anaesthetists' Society, May 13-16, 1968. This investigation was supported in part by research grants NB-7507 and HE-4881 from the National Institutes of Health, Public Health Service.






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Copyright © 1968 by the Canadian Anesthesiologists' Society.