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Related Experiment Videos

Relationship between urinary bladder and pulmonary artery temperatures: a preliminary study.

J K Earp1, D C Finlayson

  • 1Division of Adult Health Nursing, Nell Hodgson Woodruff School of Nursing, Emory University, Atlanta, GA 30322.

Heart & Lung : the Journal of Critical Care
|May 1, 1991
PubMed
Summary

Urinary bladder temperature closely correlates with pulmonary artery temperature during cardiac surgery rewarming. Bladder readings are slightly higher, offering a reliable core temperature assessment in hypothermic patients.

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Area of Science:

  • Cardiovascular Surgery
  • Critical Care Medicine
  • Thermoregulation

Background:

  • Accurate core temperature monitoring is crucial for managing hypothermia in cardiac surgical patients.
  • Pulmonary artery temperature is a standard core temperature measure, but its assessment can be invasive.
  • Urinary bladder temperature presents a potential alternative for core temperature monitoring.

Purpose of the Study:

  • To investigate the relationship between pulmonary artery and urinary bladder temperatures during rewarming.
  • To assess the reliability of urinary bladder temperature as a surrogate for core temperature in post-cardiac surgery patients.

Main Methods:

  • Prospective study involving 14 adult patients undergoing cardiac surgery.
  • Continuous monitoring of pulmonary artery and urinary bladder temperatures for 6 hours post-cardiopulmonary bypass.

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  • Correlation analysis to determine the relationship between the two temperature sites.

    • Main Results:

    • Urinary bladder temperatures were consistently 0.1°C to 0.2°C higher than pulmonary artery temperatures.
    • High correlation coefficients (0.94–0.99) were observed between the two temperature measurements.
    • Temperature differences showed variations, particularly in the early and late rewarming phases.

    Conclusions:

    • Urinary bladder temperature is a reliable and closely correlated indicator of pulmonary artery temperature during rewarming in cardiac surgical patients.
    • The slight temperature gradient and occasional reversals warrant further investigation in relation to metabolic activity and external influences.
    • Bladder temperature may offer a less invasive method for core temperature monitoring in this patient population.