Researchers have found that physiologic changes occur that indicate infants do perceive pain. In the study, infants were audiovideotaped while receiving the first diphtheria-pertussis-tetanus (DPT) injection to document their responses to an assumed painful stimulus. The vocalization of crying and some facial movements were identified as behaviors associated with receiving the DTP injection. These findings support the need for nurses to use a multidimensional assessment when caring for infants believed to be having pain.
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