Journal of Obstetric, Gynecologic & Neonatal Nursing
CLINICAL STUDIESInfrared Tympanic Thermometry for Neonatal Temperature Assessment
Section snippets
Methods
A descriptive and comparative design was used to address the aims of the study. Accuracy, defined as equivalence to a standard, was assessed by comparing ear with axillary and rectal temperature readings. Precision was defined as repeatability of same ear measurements and reproducibility of opposite ear measurements. The effect of neonatal position was investigated by comparing temperature readings obtained in the ear lying against the crib mattress (protected ear) with readings in the ear
Assessing Precision With Infrared Tympanic Thermometers
Using repeated measures analysis of variance, there were no significant differences within repeated same ear temperature readings or between left and right ear readings taken with the professional and consumer models. Because the three readings in each ear were taken sequentially in a short period of time, it was assumed that these readings measured the same temperature. Mean absolute differences, maximum differences, and percent of differences exceeding 0.2°C were calculated (see Table 1), as
Discussion
Although tympanic and axillary mean temperatures were remarkably similar and not statistically different, correlations between readings were low and supported prior results with full-term and preterm infants (Weiss, 1991). Low correlations may have been the result of limited range of temperatures in this homogeneous sample of neonates and site or operator-related measurement error. Tympanic, axillary, and rectal sites reflect different physiologic processes that may result in varying degrees of
Limitations
Several limitations should be considered when interpreting the results of this study. Subjects were not randomly selected, the order of temperature recordings was not randomly assigned, and the data collector was not blinded to the temperature recordings. There was no attempt to control for environmental variables such as room temperature, amount of clothing and swaddling blankets, or the infant’s activity level. Ages of the neonates at the first temperature recordings varied.
This study
Nursing Implications
If tympanic measurement is to be used in the assessment of temperature with neonates, clinicians will need to learn normal values for tympanic measurement, to understand the relationship of tympanic temperature to temperature readings obtained at other sites, and to recognize the degree of variation possible with this and other methods of temperature measurement. The variation in tympanic readings, when compared to axillary and rectal recordings, may not be acceptable for assessment of
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