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Urinary bladder and oesophageal temperatures correlate better in patients with high rather than low urinary flow rates during non-cardiac surgery

Published online by Cambridge University Press:  01 October 2008

H. Sato
Affiliation:
University of Yamanashi, Faculty of Medicine, Department of Anesthesiology, Chuo, Yamanashi
M. Yamakage*
Affiliation:
Sapporo Medical University School of Medicine, Department of Anesthesiology, Sapporo, Hokkaido, Japan
K. Okuyama
Affiliation:
University of Yamanashi, Faculty of Medicine, Department of Anesthesiology, Chuo, Yamanashi
Y. Imai
Affiliation:
University of Yamanashi, Faculty of Medicine, Department of Anesthesiology, Chuo, Yamanashi
H. Iwashita
Affiliation:
University of Yamanashi, Faculty of Medicine, Department of Anesthesiology, Chuo, Yamanashi
T. Ishiyama
Affiliation:
University of Yamanashi, Faculty of Medicine, Department of Anesthesiology, Chuo, Yamanashi
T. Matsukawa
Affiliation:
University of Yamanashi, Faculty of Medicine, Department of Anesthesiology, Chuo, Yamanashi
*
Correspondence to: Michiaki Yamakage, Department of Anesthesiology, Sapporo Medical University School of Medicine, South 1, West 16, Chuo-ku, Sapporo, Hokkaido 060-8543, Japan. E-mail: yamakage@sapmed.ac.jp; Tel: +81 11 611 2111 Ext. 3568; Fax: +81 11 631 9683
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Summary

Background and objective

To investigate the effect of urinary flow rate on the urinary bladder temperature, we compared the accuracy and precision of urinary bladder temperature with oesophageal temperature at both high and low urine flow rates.

Methods

Twenty-four patients ASA physical status I or II who were undergoing tympanoplasty were randomly assigned to two groups with different intravenous fluid volumes: high (10 mL kg−1 h−1, n = 12) and low (3 mL kg−1 h−1, n = 12). General anaesthesia was induced with propofol and maintained with sevoflurane (1.5–2.5%) in nitrous oxide and oxygen. Urinary bladder temperature was measured using a Foley urinary catheter; distal oesophageal temperature was measured using a stethoscope thermocouple. These temperatures were measured every 5 min during surgery and the accuracy and precision of urinary bladder temperature with oesophageal temperature were determined using regression and Bland and Altman analyses.

Results

The correlation coefficient for oesophageal and urinary bladder temperature was 0.90 in the high urinary volume group and 0.75 in the low urinary volume group. The offset (oesophageal–urinary bladder) was −0.13 ± 0.32°C and −0.46 ± 0.45°C, respectively.

Conclusion

Urinary bladder temperature appears to be more accurate at high urinary flow rates than at low urinary flow rates for clinical use.

Type
Original Article
Copyright
Copyright © European Society of Anaesthesiology 2008

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