Cardiothoracic & vascular anesthesia
Accuracy of non-invasive sensors measuring core body temperature in cardiac surgery intensive care unit (ICU) patients – results from a monocentric prospective observational study
Authors' conclusion
Core temperature was generally underestimated by the non-invasive approaches. In our study, ZHF outperformed DS. In terms of agreement, results for both sensors were outside the range that is considered clinically acceptable.
Study context
- Population
- Patients admitted to the ICU after cardiac surgery1,600 measurement sets
- Participants
- 40 patients
- Exposure
- Double-Sensor (DS) and Zero-Heat-Flux (ZHF) forehead sensors vs pulmonary artery catheter (PAC) core temperature
- Outcome
- Agreement with PAC core temperature (Bland-Altman for repeated measurements)
Methodological detailsmethod comparison, monocentric, Measurements every 5 min, up to 40 data sets per patient
- Method comparison
- Monocentric
- Measurements every 5 min, up to 40 data sets per patient
Main finding
As reported in the abstract
Agreement with PAC (Bland-Altman mean bias ± 95% LoA)
| Group | Value | Lin's concordance correlation coefficient (LCCC) |
|---|---|---|
| DS | mean bias −0.82 (95% Limits-of-Agreement (LoA) ± 1.27) °C | 0.5 |
| ZHF | mean bias - 0.54 (95% LoA ± 1.14) °C | 0.63 |
Value
DSmean bias −0.82 (95% LoA ± 1.27) °C
ZHFmean bias - 0.54 (95% LoA ± 1.14) °C
Lin's concordance correlation coefficient (LCCC)
DS0.5
ZHF0.63
Observational data: associations, not effects.
Further findings
| Outcome | DS | ZHF |
|---|---|---|
| Detection of hyperthermia (≥ 38 °C) | ||
| Sensitivity | 0.12 | 0.35 |
| Specificity | 0.99 | 1.0 |
| Detection of hypothermia (< 36 °C) | ||
| Sensitivity | 0.95 | 1.0 |
| Specificity | 0.72 | 0.85 |
Mean bias in hyperthermic and hypothermic patients (subgroup)
- Mean bias significantly higher in hyperthermic and hypothermic patients
Original publication
Accuracy of non-invasive sensors measuring core body temperature in cardiac surgery ICU patients – results from a monocentric prospective observational study. J Clin Monit Comput. Published 12 July 2023. doi:10.
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