Comparison of Pain Responses in Infants of Different Gestational Ages

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Abstract
Background: There is a plethora of infant pain measures; however, none of them have been validated for extremely low for gestational age (ELGA) infants (Objectives: To compare physiological (heart rate, oxygen saturation) and behavioral (9 facial activities, cry) pain indicators of ELGA infants with infants of varying more mature gestational ages (GAs). Methods: The aim was to determine the effects of GA on pain response. GA was categorized into four mutually exclusive strata: 36 weeks. Physiological data during four phases of a routine heel lance were collected by placing disposable ECG electrodes and pulse oximetry probes on the infant’s chest. Behavioral data were collected by videotaping facial activities, and cry data were collected by audio recording. Results: Four facial activities (brow bulge, eye squeeze, nasolabial furrow, vertical mouth stretch) in response to acute pain were present in ELGA infants. Facial activities increased following painful procedures and the magnitude of responses was proportional to GA with the youngest infants (Discussion: ELGA infants have similar pain responses to older infants, but the responses are dampened. Other factors such as severity of illness, frequency of painful procedures or medication use should be examined, as they may influence the pain responses in ELGA infants.

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