Evaluation of a 7.5 French pulmonary catheter for continuous monitoring of cerebral venous oxygen saturation.
We studied a 7.5 French Opticat fiberoptic catheter/Oximetrix computer system as a tool for continuous monitoring of oxygen saturation of jugular venous blood. Eight healthy volunteers had a catheter placed with the tip in the bulb of the right internal jugular vein. During baseline condition, hyperventilation, and rebreathing, jugular venous oxygen saturations ranging from 35 to 85% were obtained. Simultaneous with drawing a blood sample, the value obtained with the fiberoptic catheter was recorded. The oxygen saturation of the blood sample was analyzed in vitro using a bench oximeter. A total of 150 paired values was obtained. In 15 of these cases, the computer indicated that the intensity of the reflected light was insufficient. A difference of > 12% oxygen saturation between the paired values was obtained for all of these pairs. The regression coefficient for the remaining 135 data pairs was 0.95, the mean difference was -0.54%, and the limits of agreement were -9.5 to 8.4%. We conclude that the 7.5 French Opticat catheter is useful if values obtained during improper light intensity are excluded.
Olsen
K S
KS
Department of Anesthesia and Clinical Physiology, Rigshospitalet, Copenhagen, Denmark.
Madsen
P L
PL
Børme
T
T
Schmidt
J F
JF
D000328:Adult; D001794:Blood Pressure / Q000502:physiology; D001921:Brain / Q000378:metabolism; D002245:Carbon Dioxide / Q000032:analysis / Q000097:blood; D002404:Catheterization / Q000295:instrumentation; D002405:Catheterization, Central Venous / Q000295:instrumentation* / Q000379:methods; D002560:Cerebrovascular Circulation / Q000502:physiology; D003199:Computer Systems; D004867:Equipment Design; D005069:Evaluation Studies as Topic; D005260:Female; D005336:Fiber Optic Technology / Q000295:instrumentation; D006801:Humans; D007601:Jugular Veins / Q000502:physiology; D008297:Male; D008991:Monitoring, Physiologic / Q000295:instrumentation*; D010092:Oximetry / Q000295:instrumentation; D010100:Oxygen / Q000097:blood*; D010101:Oxygen Consumption / Q000502:physiology; D011651:Pulmonary Artery; D012044:Regression Analysis
D002245:Carbon Dioxide; D010100:Oxygen