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Physiologic circadian rhythmicity in preterm infants.

P A Updike, F J Accurso, R H Jones

    Nursing Research
    |May 1, 1985
    PubMed
    Summary

    Preterm infants show circadian rhythms in skin temperature and other vital signs. Transcutaneous oxygen levels and respiratory pauses followed a day/night pattern, peaking overnight.

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    Area of Science:

    • Neonatal Physiology
    • Chronobiology
    • Pediatric Research

    Background:

    • Circadian rhythms are fundamental to physiological regulation in full-term infants.
    • Understanding these rhythms in preterm infants is crucial for optimizing their care and development.
    • Limited data exists on the presence and synchrony of circadian rhythms in very preterm neonates.

    Purpose of the Study:

    • To investigate the evidence of circadian rhythmicity in key physiological variables of preterm infants.
    • To determine if transcutaneous oxygen (tcPO2) levels, pulse rate, respiratory rate, respiratory pause frequency, and skin temperature exhibit daily patterns.
    • To assess the synchrony of these rhythms across multiple preterm infants.

    Main Methods:

    • Continuous monitoring of physiological variables (tcPO2, pulse rate, respiratory rate, respiratory pause frequency, skin temperature) for 24 hours in six preterm infants (34-37 weeks gestation).
    • Data collection every 30 minutes, resulting in 245 observations per infant.
    • Application of an adapted cosinor analysis to identify 24-hour sinusoidal patterns in the collected data.

    Main Results:

    • Statistically significant circadian rhythmicity was observed in skin temperature for five out of six infants.
    • Significant circadian rhythms were also found in two or three infants for tcPO2, pulse rate, respiratory rate, and respiratory pause frequency.
    • While individual rhythms varied, a consistent pattern emerged with peak respiratory pause frequency and trough tcPO2 occurring between midnight and 4:30 A.M. for all infants.

    Conclusions:

    • Preterm infants demonstrate evidence of circadian rhythmicity in skin temperature.
    • Transcutaneous oxygen levels and respiratory pause frequency exhibit day/night pattern characteristics in preterm infants.
    • While individual synchrony is limited, specific physiological variables show predictable daily patterns crucial for neonatal care.

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