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Related Experiment Videos

Newborn infants' cry after heel-prick: analysis with sound spectrogram.

P Runefors1, E Arnbjörnsson, G Elander

  • 1Department of Paediatrics, Växjö Hospital, Sweden. per.runefors@ltkronoberg.se

Acta Paediatrica (Oslo, Norway : 1992)
|February 17, 2000
PubMed
Summary

Newborn infant cries can indicate pain, with initial cries showing higher frequencies and longer durations. However, pain measurement requires knowing the cry

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Area of Science:

  • Neonatal care
  • Pain assessment
  • Infant cry analysis

Background:

  • Newborn infants experience pain, necessitating reliable assessment methods.
  • Infant crying is a primary communication signal, often indicating distress or pain.
  • Objective measures for pain in neonates are crucial for appropriate clinical management.

Purpose of the Study:

  • To investigate the potential of using newborn infant cry characteristics to measure pain.
  • To analyze acoustic properties of cries following a painful stimulus.
  • To determine if specific cry features correlate with pain intensity or duration.

Main Methods:

  • Prospective, descriptive study involving 50 healthy newborn infants.
  • Heel-prick stimulus administered for phenylketonuria screening.

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  • Recording and spectrographic analysis of cry sounds, including duration, fundamental frequency, and melody.

    • Main Results:

    • Cries following the heel-prick stimulus exhibited significantly higher fundamental frequencies and longer durations in the initial cries compared to later ones.
    • The acoustic properties of the first cry differed significantly from the fifth cry, suggesting a change in the nature of crying.
    • Substantial inter-infant variability was observed in cry duration, total crying time, and fundamental frequencies.

    Conclusions:

    • Newborn infants demonstrate recognizable physiological responses to pain through their cries.
    • Cry analysis shows potential for pain assessment, but acoustic features can be influenced by various stimuli.
    • Accurate pain measurement using infant cries is feasible only when the specific cause of crying is identified.