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Canadian Journal of Anesthesia, Vol 32, 607-612, Copyright © 1985 by Canadian Anesthesiologists' Society

Site of Temperature Monitoring and Prediction of Afterdrop after Open Heart Surgery

JAMES G. RAMSAY MD1, FIONA E. RALLEY MB CHB1, DAVID G. WHALLEY MB CHB1, PETER DELLICOLLI RRAT1, and J. EARL WYNANDS MD1

1 Department of Anaesthesia, Royal Victoria Hospital and McGill University, Montreal, Quebec

Address correspondence to: Dr. J. Earl Wynands, Department of Anaesthesia, Royal Victoria Hospital, 587 Pine Avenue West, Montreal, Quebec H3A 1A1.

To determine which of the commonly used "core" temperature sites, remote from the brain, best indicates total body rewarming, the temperatures in the rectum (RT), urinary bladder (UBT) and the pulmonary artery (PAT) at the termination of cardiopulmonary bypass (CPB) were correlated with the decrease in nasopharyngeal temperature (NPT) after CPB (afterdrop) in 29 patients. The amount of afterdrop is inversely related to the adequacy of total body rewarming, smaller values indicating better rewarming. All patients had uncomplicated cardiac surgery and received high pump flows during rewarming on CPB. The UBT showed the best correlation with afterdrop (p < 0.001) compared with the other temperature sites, the durations of CPB and rewarming during CPB, and the time that the NPT was greater than 37° C during rewarming.

The urinary bladder is a simple, non-invasive monitoring site when a urinary catheter is required and our results indicated that the UBT is a better monitor of the adequacy of total body rewarming on CPB than NPT alone. The study also suggested that rewarming to a UBT in excess of 36.2° C prior to the termination of CPB is unlikely to further reduce afterdrop.

Key Words: TEMPERATURE: body rewarming • MONITORING: site of temperature probes • SURGERY: cardiovascular




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Reliability of temperatures measured at standard monitoring sites as an index of brain temperature during deep hypothermic cardiopulmonary bypass conducted for thoracic aortic reconstruction
J. Thorac. Cardiovasc. Surg., June 1, 2007; 133(6): 1559 - 1565.
[Abstract] [Full Text] [PDF]


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Copyright © 1985 by the Canadian Anesthesiologists' Society.