Evaluation of a new, wearable, precision phase-change thermometer in neonates

The primary purpose of this research was to examine the quantitative relationship between a new, wearable, continuous-read, precision phase-change thermometer (WCPPT) and a glass-mercury thermometer used in the axilla (GMA) in neonates. The study design was prospective and quasi-experimental with each subject acting as his/her own control. Data were collected in a tertiary teaching facility in the Southwestern United States from a convenience sample of 29 neonates. Simultaneous test and reference temperature measurements were taken from each neonate. Measurements were compared to determine clinical bias (mean difference +/- 1 standard deviation [SD]) and clinical agreement portrayed graphically (mean difference and limits of agreement plotted against the mean of both test and reference measurements) (Bland & Altman, 1986). Key findings included a clinical bias between the GMA and the TraxIt WCPPT of 0.04 degrees C (+/- 0.22) (mean difference +/- 1 SD) during the first measurement session with the GMA slightly higher, and -0.11 degrees C (+/- 0.17) (mean difference +/- 1 SD) during the second measurement with the WCPPT slightly higher. Bland and Altman representations supported these findings. These outcomes support a conclusion that the TraxIt WCPPT is neither clinically nor statistically different from the GMA on initial placement and exceeds GMA readings during prolonged, continuous axillary contact. Continuous thermometer placement eliminates drawdown, the transitory, local cooling effect of intermittent thermometer placement.