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Published on: August 9, 2013
Correlating Infrared Surface Thermometry With Core Temperature Assessments in Simulated Cooling and Rewarming of
Martin Igbokwe1, John Wang2, Cory Byrne3
1Multi-Organ Transplant Program, London Health Sciences Centre, London, Ontario, Canada; Schulich School of Medicine and Dentistry, London, Ontario, Canada.
Background:
In developing strategies to analyze the effects of controlled rewarming of donor kidneys, accurate and reproducible measurements of renal temperatures are required. While invasive probes provide accurate core temperature measurements, they risk tissue damage and may compromise the sterile field. Infrared thermometry (IRT) offers a non-contact alternative, but correlation with renal core temperature remains insufficiently validated in transplant-related scenarios.
Objective:
To correlate surface IRT temperatures compared with core temperature assessments in porcine models of donor kidney cooling and rewarming.
Methods:
This study was conducted in a controlled surgical setting. Porcine kidneys were procured for study. Core temperatures were measured with a calibrated thermocouple probe (Physitemp Thermalert TH-8) inserted into the renal pelvis via the ureter. Surface temperature was recorded using a non-contact infrared thermometer (CEM DT-8839) held 10 to 15 cm perpendicular to the renal capsule. Measurements were obtained by both techniques every minute from cold flush with perfusion solution and during rewarming. Agreement between modalities was assessed with Bland-Altman analysis, and correlation was determined using Pearson's coefficient.
Results:
Across all phases, IRT measurements demonstrated strong correlation with core temperatures (r > 0.9, p < .001). Bland-Altman plots indicated minimal systematic bias, with narrower limits of agreement during steady-state cooling and wider variability during rewarming. IRT effectively tracked temperature trends, though minor deviations (±0.5-1.0°C) from core readings were observed during dynamic thermal transitions.
Conclusions:
Surface IRT has strong correlation with core temperature during pig kidney cooling and rewarming. IRT is well suited for trend monitoring and intraoperative workflow guidance during evaluation of controlled rewarming of donor kidneys.
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