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Ann Thorac Surg 2002;73:S373
© 2002 The Society of Thoracic Surgeons

SUPPLEMENT: OUTCOMES 2001: SCIENTIFIC ABSTRACTS

Arterial temperature measurement inaccuracies in the extracorporeal circuit

R.G. Sutton, MS, CCPa, S. Jackson, BSa, D.E. Baker, BS, CCPa, M. Djuric, MA, CCPa

a Extracorporeal Services, Rush-Presbyterian-St. Luke’s Medical Center, Chicago, Illinois, USA

Introduction. Arterial blood temperature greater than 37°C during the rewarming phase of cardiopulmonary is associated with postoperative cerebral vascular injury and cognitive dysfunction. The purpose of this study was to determine the accuracy of temperature measurements at various points in the arterial line of the extracorporeal circuit.

Methods. An in vitro circuit consisting of a heater-cooler, roller pump, membrane oxygenator, arterial line filter, and A-V loop was primed with crystalloid solution. Backpressure on the arterial line was maintained at 150 mm Hg. Temperatures were monitored at the following sites: arterial outlet of the membrane oxygenator (coupling site), CDI 500 arterial blood gas shunt sensor, 4 feet distal to the arterial line filter utilizing a myocardial temperature probe, heater-cooler water, and room air. Water temperatures (25 to 41°C), pump flows (2.5 to 5.5 L/min), and room air (55 to 85°F) were varied. Because the temperature probe of the distal site was in direct contact with the prime, that site was considered the actual temperature.

Results. Data analysis demonstrated a positive correlation between the oxygenator, CDI, and distal temperatures. However, the distal temperatures read higher than the oxygenator and CDI temperatures (p < 0.001), with an average difference of 0.99°C and 0.98°C, respectively. In addition, the oxygenator temperature error was correlated with room temperature (p < 0.05).

Conclusions. The distal temperature is higher than the arterial membrane oxygenator reading. Therefore, the oxygenator arterial temperature reading should not exceed 36°C.





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