Increasing evidence has demonstrated that pain from venipuncture and intravenous cannulation is an important source of pediatric pain and has a lasting impact. Ascending sensory neural pain pathways are functioning in preterm and term infants, yet descending inhibitory pathways seem to mature postnatally. Consequently, infants may experience pain from the same stimulus more intensely than older children. In addition, painful perinatal procedures such as heel lancing or circumcision have been found to correlate with stronger negative responses to venipuncture and intramuscular vaccinations weeks to months later. Similarly, older children have reported greater pain during follow-up cancer-related procedures if the pain of the initial procedure was poorly controlled, despite improved analgesia during the subsequent procedures. Fortunately, both pharmacologic and nonpharmacologic techniques have been found to reduce children's acute pain and distress and subsequent negative behaviors during venipuncture and intravenous catheter insertion. This review summarizes the evidence for the importance of managing pediatric procedural pain and methods for reducing venous access pain. Pediatrics 2008;122:S130-S133 E LIMINATION OR RELIEF of pain and suffering, whenever possible, is an important responsibility of physicians caring for children, 1 because unmanaged pain can result in a variety of negative long-term consequences. 2 This general precept encompasses the management of pain associated with venipuncture and intravenous (IV) cannulation, routine procedures that may be viewed by many health care professionals, erroneously, as having little significance and impact. Increasing evidence has demonstrated that venous access procedures are an important source of pediatric pain that should be managed proactively. The purpose of this review is to briefly summarize the data demonstrating the importance of managing pediatric procedural pain in general, and venous access pain in particular.
GENERAL CONSIDERATIONSUnderstanding of the ontogeny of the pediatric pain experience has increased significantly over the past 2 decades. Accumulating evidence has indicated that pain is perceived earlier in life than had been previously believed. By the middle of the third trimester of human gestation, ascending pain fibers fully connect to the primary somatosensory cortex of the brain. 3,4 Anand's landmark article 5 demonstrated that preterm infants given fentanyl in addition to nitrous oxide had significantly lower hormonal responses to surgery for ligation of the patent ductus arteriosus than did infants who did not receive fentanyl. Neonates who received high-dose sufentanil compared with halothanemorphine had improved survival rates after cardiac surgery, 6 whereas infants in the NICU have been shown to be able to distinguish real from sham heel sticks. 7 These results are consistent with the existence of functioning neural pathways for pain sensation at early times. Descending inhibitory pain pathways, on the other hand, seem to r...