Clinical importance of pain and stress in preterm neonates

The calming effect of maternal breast milk odor on premature infants

BACKGROUND

To compare the effectiveness of maternal breast milk odor and formula milk odor in soothing premature infants undergoing heel lancing.

MATERIALS AND METHODS

Fifty preterm infants born between 32 weeks and 37 weeks gestation were randomly assigned into two groups. During heel lancing, we used formula milk odor for the first group and breast milk odor for the second group. A filter paper (containing either formula or breast milk) was placed near the infant's nose from 3 minutes prior to and up to 9 minutes after the heel blood sampling. The pain score was measured using premature infant pain profile (PIPP) score. We also evaluated crying duration and salivary cortisol prior to and after heel lancing.

RESULTS

After the heel lancing, the PIPP score was found to be significantly lower in the breast milk group than the formula milk group (5.4 compared to 9 with p < 0.001). Also, the level of salivary cortisol had significantly increased in the formula milk group, but not in the breast milk group (25.3 nmol/L compared to 17.7 nmol/L (p < 0.001).

CONCLUSION

Breast milk odor has an analgesic effect in preterm newborns and can be used as a safe method for pain relief.

Medical decision support using machine learning for early detection of late-onset neonatal sepsis

OBJECTIVE

The objective was to develop non-invasive predictive models for late-onset neonatal sepsis from off-the-shelf medical data and electronic medical records (EMR).

DESIGN

The data used in this study are from 299 infants admitted to the neonatal intensive care unit in the Monroe Carell Jr. Children's Hospital at Vanderbilt and evaluated for late-onset sepsis. Gold standard diagnostic labels (sepsis negative, culture positive sepsis, culture negative/clinical sepsis) were assigned based on all the laboratory, clinical and microbiology data available in EMR. Only data that were available up to 12 h after phlebotomy for blood culture testing were used to build predictive models using machine learning (ML) algorithms.

MEASUREMENT

We compared sensitivity, specificity, positive predictive value and negative predictive value of sepsis treatment of physicians with the predictions of models generated by ML algorithms.

RESULTS

The treatment sensitivity of all the nine ML algorithms and specificity of eight out of the nine ML algorithms tested exceeded that of the physician when culture-negative sepsis was included. When culture-negative sepsis was excluded both sensitivity and specificity exceeded that of the physician for all the ML algorithms. The top three predictive variables were the hematocrit or packed cell volume, chorioamnionitis and respiratory rate.

CONCLUSIONS

Predictive models developed from off-the-shelf and EMR data using ML algorithms exceeded the treatment sensitivity and treatment specificity of clinicians. A prospective study is warranted to assess the clinical utility of the ML algorithms in improving the accuracy of antibiotic use in the management of neonatal sepsis.

Effect of breastfeeding during venepuncture in neonates

BACKGROUND

Evidence suggests that infants feel pain, and painful experiences may lead to subsequent increased pain sensitivity. Owing to concerns regarding the potential adverse effects of pharmacological interventions in newborns, effective alternatives for pain control are being sought.

AIM

The Neonatal Infant Pain Scale (NIPS) was used to determine the analgesic effect of breastfeeding during venepuncture.

METHODS

The study was of cross-over design where each neonate served as his/her own control. Median pain scores during venepuncture when neonates were being breastfed (BF) were compared with those when neonates were not being breastfed (NBF). The site of venepuncture and number of previous venepunctures were noted. Pain was assessed using NIPS.

RESULTS

In all, 38 term neonates (25 male, 13 female) were recruited. Mean (SD) age and weight were 8.42 (8.74) days and 2.89 (0.67) kg, respectively. The median pain score (interquartile range) of the neonates when breastfed was 1.50 (1-2), and 4.00 (2-6) when not breastfed (p=0.0001). The Kruskal-Wallis H-test did not show statistically significant differences between the BF and NBF groups when the number of previous punctures (p=0.57, p=0.27) and site of venepuncture (p=0.71, p=0.77) were considered.

CONCLUSION

Using NIPS, it has been demonstrated that breastfeeding is analgesic in neonates during venepuncture and previous venepuncture/s and site of venepuncture do not seem to affect pain scores. Breastfeeding should be the first-choice analgesic during painful procedures in neonates.

Early life events predispose the onset of childhood functional gastrointestinal disorders

BACKGROUND

Functional gastrointestinal disorders (FGIDs) are common digestive conditions characterized by chronic or recurrent symptoms in the absence of a clearly recognized gastrointestinal etiology. The biopsychosocial model, the most accepted concept explaining chronic pain conditions, proposes that the interplay of multiple factors such as genetic susceptibility, early life experiences, sociocultural issues, and coping mechanisms affect children at different stages of their lives leading to the development of different pain phenotypes and pain behaviors. Early life events including gastrointestinal inflammation, trauma, and stress may result in maladaptive responses that could lead to the development of chronic pain conditions such as FGIDs.

AIMS

In this review, we discuss novel findings from studies regarding the long-term effect of early life events and their relationship with childhood chronic abdominal pain and FGIDs.

METHODS

A bibliographic search of the PubMed database was conducted for articles published over the last 20 years using the keywords: "Functional gastrointestinal disorders", "chronic abdominal pain", "chronic pain", "gastrointestinal inflammation", and "early life events". Forty-three articles were chosen for review.

RESULTS

Based on the current evidence, events that take place early in life predispose children to the development of chronic abdominal pain and FGIDs. Conditions that have been studied include cow's milk protein hypersensitivity, pyloric stenosis, gastrointestinal infections, and Henoch-Schonlein purpura, among others.

CONCLUSIONS

Early events may play an important role in the complex pathogenesis of functional gastrointestinal conditions. Timely intervention may have a critical impact on the prevention of this group of chronic incapacitating conditions.

Sedation and analgesia in mechanically ventilated preterm neonates: continue standard of care or experiment?

Attention to comfort and pain control are essential components of neonatal intensive care. Preterm neonates are uniquely susceptible to pain and agitation, and these exposures have a negative impact on brain development. In preterm neonates, chronic pain and agitation are common adverse effects of mechanical ventilation, and opiates or benzodiazepines are the pharmacologic agents most often used for treatment. Questions remain regarding the efficacy, safety, and neurodevelopmental impact of these therapies. Both preclinical and clinical data suggest troubling adverse drug reactions and the potential for adverse longterm neurodevelopmental impact. The negative impacts of standard pharmacologic agents suggest that alternative agents should be investigated. Dexmedetomidine is a promising alternative therapy that requires further interprofessional and multidisciplinary research in this population.

Breastfeeding or breast milk for procedural pain in neonates

BACKGROUND

Physiological changes brought about by pain may contribute to the development of morbidity in neonates. Clinical studies have shown reduction in changes in physiological parameters and pain score measurements following pre-emptive analgesic administration in situations where the neonate is experiencing pain or stress. Non-pharmacological measures (such as holding, swaddling and breastfeeding) and pharmacological measures (such as acetaminophen, sucrose and opioids) have been used for this purpose.

OBJECTIVES

The primary objective was to evaluate the effectiveness of breastfeeding or supplemental breast milk in reducing procedural pain in neonates. The secondary objective was to conduct subgroup analyses based on the type of control intervention, gestational age and the amount of supplemental breast milk given.

SEARCH METHODS

We performed a literature search using the Cochrane Central Register of Controlled Trials (CENTRAL) (The Cochrane Library 2011, Issue 10), MEDLINE (1966 to February 2011), EMBASE (1980 to February 2011), CINAHL (1982 to February 2011), abstracts from the annual meetings of the Society for Pediatric Research (1994 to 2011), and major paediatric pain conference proceedings. We did not apply any language restrictions.

SELECTION CRITERIA

Randomised controlled trials (RCTs) or quasi-RCTs of breastfeeding or supplemental breast milk versus no treatment/other measures in neonates were eligible for inclusion in this review. The study must have reported on either physiologic markers of pain or validated pain scores.

DATA COLLECTION AND ANALYSIS

We assessed the methodological quality of the trials using the information provided in the studies and by personal communication with the authors. We extracted data on relevant outcomes, estimated the effect size and reported this as a risk ratio (RR), risk difference (RD) and weighted mean difference (MD) as appropriate.

MAIN RESULTS

Of twenty eligible studies, ten evaluated breastfeeding and ten evaluated supplemental breast milk. Sixteen studies analysed used heel lance and four used venepuncture as procedure. We noted marked heterogeneity in control intervention and pain assessment measures among the studies. Neonates in the breastfeeding group had statistically a significantly lower increase in heart rate, reduced proportion of crying time and reduced duration of first cry and total crying time compared to positioning (swaddled and placed in a crib), holding by mother, placebo, pacifier use, no intervention or oral sucrose group, or both.Premature Infant Pain Profile (PIPP) scores were significantly lower in the breastfeeding group compared to positioning, placebo or oral sucrose group, or both. However, there was no statistically significant difference in PIPP scores when compared to no intervention. Douleur Aigue Nouveau-ne scores (DAN) were significantly lower in the breastfeeding group compared to the placebo group and the group held in mother's arms, but not when compared to the glucose group. Neonatal Infant Pain Scale (NIPS) was significantly lower in the breastfeeding group compared to the no intervention group, but there was no difference when compared to the oral sucrose group. The Neonatal Facial Coding System (NFCS) was significantly lower in the breastfeeding group when compared to oral glucose, pacifier use, holding by mother and no intervention, but no difference was found when compared to formula feeding.Supplemental breast milk yielded variable results. Neonates in the supplemental breast milk group had a significantly lower increase in heart rate, a reduction in duration of crying and a lower NFCS compared to the placebo group. Neonates in the supplemental breast milk group had a significantly higher increase in heart rate changes when compared to the sucrose group. Sucrose (in any concentration, i.e. 12.5%, 20%, 25%) was found to reduce the duration of cry when compared to breast milk, as did glycine, pacifier use, rocking, or no intervention. Breast milk was found not to be effective in reducing validated and non-validated pain scores such as NIPS, NFCS, and DAN; only being significantly better when compared to placebo (water) or massage. We did not identify any study that has evaluated safety/effectiveness of repeated administration of breastfeeding or supplemental breast milk for pain relief.

AUTHORS' CONCLUSIONS

If available, breastfeeding or breast milk should be used to alleviate procedural pain in neonates undergoing a single painful procedure rather than placebo, positioning or no intervention. Administration of glucose/sucrose had similar effectiveness as breastfeeding for reducing pain. The effectiveness of breast milk for painful procedure should be studied in the preterm population, as there are currently a limited number of studies in the literature that have assessed it's effectiveness in this population.

Arrhythmia associated with tetracaine in an extremely low birth weight premature infant

Infants in NICUs undergo a variety of painful procedures. The management of pain has become an integral part of newborn infant care with the use of both systemic and topical agents to provide analgesia and anesthesia for procedural pain. Tetracaine and prilocaine-lidocaine are the 2 topical anesthetics most frequently used. Tetracaine belongs to an ester group of local anesthetics available as a topical 4% gel (Ametop, Smith and Nephew, Canada). The major side effects reported when using topical anesthetics are cutaneous reactions. There are no definite reports of systemic toxicity in the published literature. We present a recent case of an extremely low birth weight premature infant who developed a clinically significant arrhythmia after topical tetracaine was applied before the insertion of a peripherally inserted central catheter. The infant had no other identifiable cause for the resulting bradycardia that occurred only after Ametop was applied. The cardiac symptoms resolved with treatment. This case highlights a significant potential adverse event when using topical tetracaine.

Fetal neurophysiology according to gestational age

More than 99% of the human neocortex is fashioned during intrauterine life, resulting in the fascinating diversity of fetal functions and activities. The objective of this review is to present the most significant neurodevelopmental events, as well as new findings about prenatal motor and sensory development.

Analgesic and sedative drugs in newborns requiring respiratory support

Infants receiving respiratory assistance may feel pain due to underlying disease or ventilation itself. Pain control during neonatal respiratory care reduces morbidity. This article summarizes the main scientific evidence about the use of drugs during ventilatory assistance, and provides some practical suggestions on pain management in neonates with respiratory support.

Pain management, morphine administration, and outcomes in preterm infants: a review of the literature

Infants in the Neonatal Intensive Care Unit may experience a myriad of painful procedures and stressful experiences. Pain management for infants requiring mechanical ventilation is complex and challenging especially in the preterm population. Many infants may not receive analgesia, primarily due to the unknown long-term neurodevelopmental effects of morphine exposure on the developing brain. Currently, there is no consensus on how to treat pain related to mechanical ventilation due to conflicting scientific evidence lacks clarity and certainty about the role of morphine in pain in preterm infants. The Advance Practice Neonatal Nurse must make the best use of available information about morphine analgesia for the preterm infant, and use it to guide policy and practice for infants. The Advance Practice Neonatal Nurse must use his/her clinical expertise to judicially balance the risks and benefits of morphine analgesia, when used, and tailor the treatment plan to each infant's specific needs.

Premedication for endotracheal intubation in the newborn infant

Endotracheal intubation, a common procedure in newborn care, is associated with pain and cardiorespiratory instability. The use of premedication reduces the adverse physiological responses of bradycardia, systemic hypertension, intracranial hypertension and hypoxia. Perhaps more importantly, premedication decreases the pain and discomfort associated with the procedure. All newborn infants, therefore, should receive analgesic premedication for endotracheal intubation except in emergency situations. Based on current evidence, an optimal protocol for premedication is to administer a vagolytic (intravenous [IV] atropine 20 μg/kg), a rapid-acting analgesic (IV fentanyl 3 μg/kg to 5 μg/kg; slow infusion) and a short-duration muscle relaxant (IV succinylcholine 2 mg/kg). Intubations should be performed or supervised by trained staff, with close monitoring of the infant throughout.

Knowledge and attitudes regarding neonatal pain among nursing staff of pediatric department: an Indian experience

Neonates receiving care in intensive care units are highly likely to experience pain due to investigations and/or treatments carried out by the health care providers. Neonates are a vulnerable population because they are unable to vocalize their pain. Unaddressed and mismanaged pain can not only affect the child's comfort, but also may alter the development and cognitive abilities of the child in a later part of his/her life. Therefore it is entirely the caregiver's responsibility to accurately assess and manage neonatal pain. We assessed and compared the knowledge and attitudes regarding neonatal pain among the nurses posted in the various units of a pediatric department [pediatric ward, pediatric intensive care unit (PICU) and neonatal intensive care unit (NICU)]. An appropriately modified Knowledge and Attitudes Survey Regarding Pain questionnaire was consensually validated, pretested, and then administered to the nursing staff of the pediatric department at a department at a hospital in Gujarat. Data were entered in Epi-Info and analyzed with the use of SPSS 14.0. The questionnaire was administered to 41 nurses working in the Department of Pediatrics, and the response rate was 97.5%. Mean age of the nurses in the study sample was 25.75 years (SD 5.513). The mean total score of the participants was 8.75 out of 17 (SD 2.549), which was unsatisfactory. The mean correct answer rate was 49.67% among the staff of NICU and 48.67% among the pediatric ward and PICU staff. The attitudes among the nurses were assessed. It was concluded that the nurses lack knowledge and that their attitudes also were hindering pain management. One of the barriers identified by the nurses was that physicians do not prescribe analgesics for managing neonatal pain. So not only the nursing staff, but all of the caregivers involved in neonatal care may be lacking in knowledge and hold perceptions and attitudes that hamper neonatal pain management.

Schore's regulation theory: maternal-infant interaction in the NICU as a mechanism for reducing the effects of allostatic load on neurodevelopment in premature infants

Premature infants confront numerous physiologic and environmental stressors in the neonatal intensive care unit (NICU) that have the potential to permanently alter their neurodevelopment. Schore's regulation theory postulates that positive maternal-infant interactions can shape the infant's developmental outcomes through inducing mechanistic changes in brain structure and function. The purposes of this article are to explain the regulation of infant neurobiological processes during interactions between mothers and healthy infants in the context of Schore's theory, to identify threats to these processes for premature infants, and to propose principles of clinical practice and areas of research necessary to establish a supportive environment and prevent or reduce maladaptive consequences for these vulnerable infants. A premature birth results in the disruption of neurodevelopment at a critical time. Chronic exposure to stressors related to the NICU environment overwhelms immature physiologic and stress systems, resulting in significant allostatic load, as measured by long-term neurodevelopmental impairments in the premature infant. Positive maternal-infant interactions during NICU hospitalization and beyond have the potential to reduce neurologic deficits and maximize positive neurodevelopmental outcomes in premature infants. The quality of the maternal-infant interaction is affected not only by the infant's developing neurobiology but also by the mother's responses to the stressors surrounding a premature birth and mothering an infant in the NICU environment. Nurses can empower mothers to overcome these stressors, promote sensitive interactions with their infants, and facilitate neurodevelopment. Research is critically needed to develop and test nursing interventions directed at assisting mothers in supporting optimal neurodevelopment for their infants.

Stress response and procedural pain in the preterm newborn: the role of pharmacological and non-pharmacological treatments

Repeated invasive procedures occur routinely in neonates who require intensive care, causing pain at a time when it is developmentally unexpected. Multiple lines of evidence suggest that repeated and prolonged pain exposure alters their subsequent pain processing, long-term development, and behaviour. Primary outcome of this study was to evaluate the reduction of procedural pain induced by "heel-lances" in preterm newborns with three different treatment [administration of fentanyl (FE, 1-2 μg/kg), facilitated tucking (FT), sensorial saturation (SS)]. Secondary outcome was the measurement of the levels of cytokines as markers of stress correlated to pain. A prospective randomized controlled trial (RCT) comparing three different pharmacological or non-pharmacological treatments was performed involving 150 preterm newborn (gestational age 27-32 weeks). No other analgesic treatment was performed during the study. CRIES score was used to evaluate the procedural pain. The results showed that the reduction in the pain score was greater in FE and SS groups than FS group. The differences were statistically significant (p < 0.01). The levels of IL-6, IL-8, and TNF-α were higher in the FT individuals than in the FE or SS-treated infants at 1 day (p < 0.01), at 3 days (p < 0.01), and at 7 days (p < 0.01) of life.

CONCLUSIONS

The findings of this study suggest that FE and SS provide a superior analgesia in preterm neonates during procedural pain. In particular, sensorial saturation seems to be an important non-pharmacological alternative treatment to prevent and reduce the procedural pain in preterm newborn.

Understanding Chronic Pain in a Lifestyle Context

This article reviews both traditional and emerging aspects of pain medicine within the context of a “whole-person,” lifestyle-based approach. This is consistent with contemporary systems theory formulations of chronic disease in general. A traditional approach sees ongoing pain as a fixed biological disorder and much of its management as the task of medically palliating or learning to cope. Within this framework, chronic pain has been conceptualized by some authors as a disease in its own right based on underlying alterations in nervous system processing. This explains the stronger correlation of chronic pain with neural sensitization than with structural change in bodily tissues. However, recent research findings are expanding current views of causation and management, and there is now a growing recognition that pain-related nervous system changes are potentially reversible. The so-called paradox of plasticity proposes that the same property of changeability in the nervous system that allows chronic pain to develop can also lead to its resolution. Nutrition and personal story are key aspects of an emerging whole-person approach and can be combined with traditional biomedical and cognitive behavioral interventions to enhance therapeutic gains. An interesting hypothesis deriving from recent research is that multiple unhelpful aspects of lifestyle contribute to systemic metaflammation, which in turn spills over to sensitize the nervous system and facilitate pain-related transmission. Therefore, addressing lifestyle factors therapeutically has the potential to desensitize the nervous system and reduce pain.

Pain in neonatal intensive care: role of melatonin as an analgesic antioxidant

Endotracheal intubation is a common painful procedure in newborn care. Neonates are more sensitive to pain than older infants, children, and adults, and this hypersensitivity is further exacerbated in preterm neonates. The aim of this study was to evaluate the analgesic activity of melatonin during endotracheal intubation of the newborn by using the Neonatal Infant Pain Scale (NIPS) and Premature Infant Pain Profile (PIPP) score. Secondary outcome was an evaluation of melatonin as inflammatory responses. This was performed by measuring the levels of pro- and anti-inflammatory cytokines implicated in the pain. Sixty preterm infants were enrolled in the study and were randomly divided into two groups: 30 infants treated with melatonin plus common sedation and analgesia recommended by Italian Society of Neonatology (group 1) and 30 infants treated with only common sedation and analgesia. The sedative and analgesic drugs included atropine, fentanyl, and vecuronium. The reduction in pain score (NIPS) was similar in both groups at an early phase, while it (PIPP score) was lower in melatonin-treated group infants than the other newborns at a late phase, during intubation and mechanical ventilation. The differences were statistically significant at 12, 24, 48, and 72 hr (P < 0.001). Pro-inflammatory and anti-inflammatory cytokines (IL-6, IL-8, IL-10 and IL-12) were higher in the common sedation and analgesia group than in melatonin-treated infants at 24, 48, 72 hr and 7 days (P < 0.001). This study suggests the use of melatonin as an adjunct analgesic therapy during procedural pain, especially when an inflammatory component is involved.

Analgesic techniques in minor painful procedures in neonatal units: a survey in northern Italy

INTRODUCTION

The aim of this survey was to evaluate the current practice regarding pain assessment and pain management strategies adopted in commonly performed minor painful procedures in Northern Italian Neonatal Intensive Care Units (NICUs).

METHODS

A multicenter survey was conducted between 2008 and 2009 in 35 NICUs. The first part of the survey form covered pain assessment tools, the timing of analgesics, and the availability of written guidelines. A second section evaluated the analgesic strategies adopted in commonly performed painful procedures. The listed analgesic procedures were as follows: oral sweet solutions alone, non-nutritive sucking (NNS) alone, a combination of sweet solutions and NNS, breast-feeding where available, and topical anesthetics.

RESULTS

Completed questionnaires were returned from 30 neonatal units (85.7% response rate). Ten of the 30 NICUs reported using pain assessment tools for minor invasive procedures. Neonatal Infant Pain Scale was the most frequently used pain scale (60%). Twenty neonatal units had written guidelines directing pain management practices. The most frequently used procedures were pacifiers alone (69%), followed by sweet-tasting solutions (58%). A 5% glucose solution was the most frequently utilized sweet-tasting solution (76.7%). A minority of NICUs (16.7%) administered 12% sucrose solutions for analgesia and the application of topical anesthetics was found in 27% of NICUs while breast-feeding was performed in 7% of NICUs.

DISCUSSION

This study found a low adherence to national and international guidelines for analgesia in minor procedures: the underuse of neonatal pain scales (33%), sucrose solution administration before heel lance (23.3%), topical anesthetics before venipuncture, or other analgesic techniques. The presence of written pain control guidelines in these regions of Northern Italy increased in recent years (from 25% to 66%).

What We have Learned from Fetal Neurophysiology?

The nervous system is one of the earliest emerging systems in fetal development. Due to progress of modern imaging technologies, such as ultrasound, a growing pool of information on the development of the central nervous system (CNS) and fetal behavioral patterns has been made available. The major events in the development of the CNS, fetal motor and sensory development as well as fetal response to stress are discussed in this review. The fetus is not entirely protected from harmful influence of the external factors. Postnatal follow-up studies have showed that many environmental influences causing the fetal stress can interfere with the fetal neurodevelopment and leave long-term and profound consequences on brain structure and function.

How to cite this article

SalihagićKadić A, Predojevic M. What We have Learned from Fetal Neurophysiology? Donald School J Ultrasound Obstet Gynecol 2012;6(2):179-188.

Early life events: infants with pyloric stenosis have a higher risk of developing chronic abdominal pain in childhood

OBJECTIVE

We hypothesize that children who had pyloric stenosis are at greater risk for developing chronic abdominal pain because this cohort combines various risk factors: an early stressful event, gastric surgery, and perioperative nasogastric tube placement in most cases.

STUDY DESIGN

This was a case control study of all children diagnosed with pyloric stenosis during infancy (cases) between January 1, 2000, and June 31, 2005, at Children's Memorial Hospital, Chicago. Because of their similar genetic and socioeconomic backgrounds, siblings aged 4 to 20 years without a history of pyloric stenosis were selected as controls. Parents of children with symptoms completed the parental form of the Pediatric GI Symptoms Rome III version questionnaire for both cases and controls. The primary outcome was the prevalence of chronic abdominal pain, and the secondary outcome was the presence of pain-associated functional gastrointestinal disorder (FGID), in accordance with Rome III criteria.

RESULTS

Cases (n = 100; mean age, 7.49 ± 1.43 years; 29 girls) and controls (n = 91; mean age, 9.20 ± 4.19 years; 29 girls) participated in the study. Mean time to follow-up was 7.2 ± 1.6 years. Chronic abdominal pain was significantly more common in cases than in controls (20/80 [25%] vs 5/91 [5.8%]; OR, 4.3; 95% CI, 1.5-12; P = .0045). Seven out of 20 subjects (35%) met the Rome III criteria for diagnosis of a pain-associated FGID (3 with irritable bowel syndrome, 2 with functional dyspepsia, and 2 with functional abdominal pain), and 1 patient in the control group (with irritable bowel syndrome) met these criteria (OR, 6.8; 95% CI, 0.82-56; P = .043).

CONCLUSION

We have described a new model to study early life events in infants. Our findings suggest that the presence of pyloric stenosis in infancy and factors involved in its perioperative care represent risk factors in the development of chronic abdominal pain in children at long-term follow-up. This study provides important data to sustain the multifactorial theoretical construct of pain-associated FGID and underscores the importance of early life events in the development of chronic abdominal pain in children.

Assessing pain in ventilated newborns and infants: validation of the Hartwig score

The Hartwig score was designed to assess pain in ventilated newborns and infants. It comprises the acceptance of mechanical ventilation and the reaction to endotracheal suctioning (grimacing, gross motor movements, eye-opening). The aim of this study was to validate the Hartwig score in terms of concurrent validity, internal consistency, inter-rater correlation and to define a cut-off value with respect to the need for analgesic therapy. Fifty-four video recordings of 28 ventilated newborns and infants up to 10 months old during endotracheal suctioning were assessed by two neonatologists and two nurses using the Hartwig score, Comfort scale and a visual analogue scale (VAS) in respect to pain. Statistical analysis was done with SPSS 12.0. Comparison of the Hartwig score with the VAS resp. Comfort scale, as according to Bland-Altman, gave a mean of the differences of 0.77 resp. 0.15. A cut-off value of 12.1 to discriminate pain requiring treatment had a sensitivity of 88.9% and a specificity of 100%. Cronbach's alpha of item correlation of the total score was 0.872, deleting the weakest item improved internal consistency to 0.895. Inter-rater correlation was found to be 0.934. Conclusion The Hartwig score showed satisfactory agreement with the VAS and good agreement with the Comfort scale. It is a reliable tool for assessing pain in ventilated newborns and infants. The cut-off value was found to be at 13 points.

Pain relief for premature infants during ophthalmology assessment

BACKGROUND

The ophthalmological examination of premature infants, which is essential for the detection of retinopathy of prematurity (ROP), can be painful and distressing for the infant. Various researchers have investigated the benefits of topical anesthesia, oral sucrose, and non pharmacological intervention for pain relief. The purpose of this study is to review the current state of knowledge on the effectiveness of these approaches.

METHODS

A literature search was performed with MEDLINE (January 1980 to January 2011) and the Cochrane Central Register of Controlled Trials, Issue 1 of 4 (January 2011), to determine the currently available evidence on methods of pain relief for premature infants undergoing ROP examination.

RESULTS

Most studies supported the use of topical proparacaine, which marginally decreased pain without any side effects. Oral sucrose did not significantly reduce pain scores during ROP examinations, and withholding feeding before the examination was not beneficial. Infants given pacifiers had lower pain scores than those without pacifiers, and infants who were nested experienced less distress during and after the procedure. Conflicting data existed on the benefits of different examination techniques, but the insertion of a lid speculum appeared to be the most uncomfortable aspect of the screening examination.

CONCLUSIONS

Topical anesthetics marginally reduce pain during eye examination in premature infants. Contrary to standard practice, it appears that patients are more comfortable if they are fed before the examination, and there is no benefit of oral sucrose. Nonpharmacological interventions, including sucking on a pacifier and nesting, may also be beneficial.

Heparinized saline vs normal saline for maintenance of intravenous access in neonates: an evidence-based practice change

PURPOSE

To design, implement, and to evaluate the outcomes of an evidence-based practice change regarding the use of heparin in intravenous (IV) locks to improve patient safety. Phase I of the project examined dwell time, hours of patency, gestational age at birth and at time of IV lock insertion, birthweight and weight at time of insertion, and reason for discontinuation for IV access devices prior to and following the practice change from heparinized saline (HS) to normal saline (NS) flush. Phase II of the project was to determine the effect of the educational program on staff knowledge of the use of heparinized saline vs normal saline flushes.

SUBJECTS

The setting was an 18 bed level III NICU located in the northeastern United States. A sample of 70 infants with IV locks were included in the study; HS (n = 34) and NS (n = 36) respectively. Infants with IV's that were converted to IV locks were excluded. Only professional NICU staff (n = 40) were recruited for the educational offering.

DESIGN

A comparative descriptive design with two components was utilized.

METHODS

A retrospective and prospective chart review was used to compare the outcomes of neonates with IV locks flushed with heparin and normal saline flush and evaluated the outcomes. A pretest/posttest design was used to analyze the change of the NICU staff's knowledge concerning heparin flush before and after an educational offering.

MAIN OUTCOME MEASURES

IV lock patency after practice change to NS flush and the change of the NICU staff's knowledge concerning heparin flush after an educational offering.

PRINCIPAL RESULTS

There was a statistically significant difference in IV catheter patency with NS flushed catheters averaging 13 hours longer than HS flushed catheters (p = 0.02). Also a statistically significant increase in mean scores was noted for the NICU staff posttest after the educational offering (p = .0001). There was a 20% increase in knowledge scores.

CONCLUSIONS

Findings from this project support the current literature base suggesting that the use of heparin is unnecessary for the maintenance of IV access devices. Unnecessary exposure of neonates to heparin increases risk to patient safety and should therefore be avoided. Future research should examine the use of heparin in central lines in neonates. Findings additionally support educating staff prior to practice changes.

Kangaroo care and behavioral and physiologic pain responses in very-low-birth-weight twins: a case study

The purpose of this case study was to describe pain responses in three study conditions: longer (30 minutes) kangaroo care (KC) before and throughout heel stick (KC30), shorter (15 minutes) KC before and throughout heel stick (KC15), and incubator care throughout heel stick (IC) in 28-week gestational age twins. Pain responses were measured by crying time, Preterm Infant Pain Profile (PIPP), and heart rate variability indexes, including low-frequency power (LF, representing sympathetic activity), high-frequency power (HF, parasympathetic activity), and LF/HF ratio (sympathetic-parasympathetic balance). Both twins cried more and had higher PIPP pain scores and tachycardia during heel stick in the IC condition. Infant B had an incident of apnea and tachycardia by the end of the heel stick and a bradycardia episode during recovery in the IC condition. The twins had lower LF/HF ratios (better autonomic nervous system balance) during recovery in both longer and shorter KC conditions compared with the IC condition. Infant B had difficulty returning to LF/HF ratio baseline level after the painful procedure in the IC condition. These data suggest that both longer and shorter KC before and throughout painful procedures can be helpful in reducing behavioral and physiologic pain responses in preterm infants.

An ounce of prevention: decreasing painful interventions in the NICU

Despite a proliferation of literature relative to pain physiology, assessment, and treatment, pain management in NICUs remains inconsistent--most often focused on assessment and treatment rather than prevention. The acceptance of pain as an inevitable part of NICU hospitalization is part of the culture in many NICUs. This article is intended to encourage discussion of pain prevention in the NICU, with a goal of creating a new "minimal-pain" NICU culture. The focus of NICU pain management programs should be on decreasing the number of painful events the NICU patient experiences. Areas for consideration include assessing the performance of procedures by novice versus experienced NICU personnel, reevaluating the role of pediatric residents in the treatment of NICU patients, evaluating the use of umbilical lines and peripherally inserted central catheters to reduce the frequency of peripheral punctures, and evaluating the admission process for ways to reduce neonatal pain and stress. This article discusses the physiology of pain in the neonate, identifies adverse outcomes related to repeated pain, and proposes practice changes that can prevent unnecessary pain in neonatal care.

Pain Assessment and Intervention for Term Newborns

A baseline assessment of pain should occur as part of a newborn's health assessment within the first few hours of life. Validation and assessment of pain in the term newborn is important for providing care because newborns may experience pain from a multitude of procedures, ranging from heel sticks to circumcisions. Current assessment tools evaluate both behavioral and physiologic parameters. In addition, providing individualized care requires a knowledge base of the interventions available to reduce or eliminate pain, such as breastfeeding, non-nutritive suck, skin-to-skin contact, and sucrose pacifiers. This article describes three newborn pain assessment tools, the use of valid assessment tools, and evidence-based interventions that are recommended to effectively manage newborn pain.

Effect of topical anesthesia and age on pain scores during retinopathy of prematurity screening

OBJECTIVE

The efficacy of topical anesthesia during retinopathy of prematurity (ROP) screening has been a controversial issue. To determine the efficacy of proparacaine eye drops (0.5%), we compared the Premature Infant Pain Profile (PIPP) scores in 40 preterm infants undergoing ROP screening.

STUDY DESIGN

Prospective randomized double masked cross-over clinical trial. The study was conducted in the neonatal intensive units for infants undergoing routine ROP screening exams. Baseline PIPP scores and post-examination PIPP scores at 1 and 5 min were compared for: (1) those receiving saline vs proparacaine eye drops (2) first ROP screening vs second ROP screening, regardless of the type of eye drops used. Wilcoxon signed-ranks test was used to pair pain scores.

RESULT

Forty preterm infants were included in the study. Mean gestational age (GA) at first and second examinations was 33.3 and 35.3 weeks, respectively. Proparacaine use significantly lowered mean PIPP scores (P=0.027) and delta scores (P=0.013) at 1 min after examination, but there was no difference at 5 min after examination. Second examinations showed significantly lower mean PIPP scores after examination (1 min (P=0.003) and 5 min (P=0.025)), regardless of the type of drop used.

CONCLUSION

Proparacaine eye drops offer significant relief of pain that is apparently short lived. Significantly lower PIPP scores at second ROP examinations suggested that infants of older GA may have a greater ability to tolerate ROP screening. We recommend the use of proparacaine eye drops for the short term, immediate relief of pain during ROP screening in preterm infants of lesser GA.

Interleukin-1 receptor antagonist ameliorates neonatal lipopolysaccharide-induced long-lasting hyperalgesia in the adult rats

An increasing amount of data show that central inflammation contributes to many debilitating diseases and produces spontaneous pain and hyperalgesia (an increased sensitivity to painful stimuli), and these processes may be associated with the production of proinflammatory cytokines by activated microglia. In the present study, we demonstrate that neonatal intracerebral injection of lipopolysaccharide (LPS) (1mg/kg) in postnatal day 5 (P5) rats produced hyperalgesia that lasted into adulthood as indicated by decreased latency in the tail-flick test. Neonatal LPS administration resulted in a long-lasting increase in the number of activated microglial in the P70 rat brain. The effects of interleukin-1beta (IL-1β) and IL-1 receptor antagonists on hyperalgesia were determined to examine the possible role of inflammatory cytokines in LPS-induced hyperalgesia. Our data show that neonatal intracerebral injection of IL-1β (1 μg/kg) produced a hyperalgesic tendency similar to that induced by LPS. Neonatal administration of an IL-1 receptor antagonist (0.1mg/kg) significantly attenuated long-lasting hyperalgesia induced by LPS and reduced the number of activated microglia in the adult rat brain. These data reveal that neonatal intracerebral LPS exposure results in long-lasting hyperalgesia and an elevated number of activated microglia in later life. This effect is similar to that induced by IL-1β and can be prevented by an IL-1 receptor antagonist. The present study suggests that an IL-1 receptor antagonist effectively attenuates or blocks long-lasting hyperalgesia and microglia activation produced by LPS exposure in the neonatal period of rats.

Wound management for children with epidermolysis bullosa

Skin and wound care in epidermolysis bullosa (EB) is specific both to the type of EB and to individual wounds within each child. Availability of dressings and personal preference are also paramount in the selection of materials. The ideal dressing is yet to be developed, although there are now a variety of suitable dressings available. This article discusses current techniques of wound and dressing management for EB simplex, junctional EB, and dystrophic EB. Factors adversely affecting healing include anemia, malnutrition, infection, and pruritus.

Relationship between feeding schedules and gastric distress during retinopathy of prematurity screening eye examinations

PURPOSE

To determine whether a relationship exists between the timing of feeding before retinopathy of prematurity (ROP) eye examinations and gastric side effects or distress associated with this examination.

METHODS

A prospective, randomized, single-masked study was conducted involving infants in the neonatal intensive care unit who required an ROP eye examination and who received normal or full enteral feeding over a 1 year period. Infants were randomly assigned to 1 of 2 study arms: feeding 1 hour before examination (arm 1) or feeding schedule adjusted to ensure no feeding within 2 hours before examination (arm 2). Physiological data, including blood pressure and pulse rate, before, during and after examination, crying time during the examination, presence of vomiting and gastric aspirates, and gastric aspirates volume 24 hours after the examination, were recorded.

RESULTS

A total of 34 infants were enrolled, with 57 separate eye examinations conducted. There was 19% less crying (p = 0.016) in arm 1 versus arm 2. Vomiting was 3-fold less in arm 1 versus arm 2 (4.2% vs 12.5%, p = 0.38). Gastric aspirates was less in arm 1 versus arm 2 (p = 0.18). Diastolic blood pressure was lower and respiratory rate greater during the examination in arm 1 (p < 0.05), whereas pulse rate was greater at the start of the examination in arm 1 (p < 0.05).

CONCLUSIONS

Feeding neonatal intensive care unit infants 1 hour before compared with withholding feeding 2 or more hours before ROP examinations may reduce stress during the examination, as measured by percentage crying during the examination, with no increased incidence of vomiting or gastric aspirates.

The efficacy of mechanical vibration analgesia for relief of heel stick pain in neonates: a novel approach

BACKGROUND

Hospitalized infants are often exposed to many painful procedures as a result of their illness or disease process. Untreated or poorly treated pain can have deleterious effects on normal nociceptive pain development as well as future development of pain pathways. Mechanical vibration has been found to be efficacious in adult and pediatric populations for the relief of mild-to-moderate acute and chronic pain. However, little is known about the efficacy of this intervention in the neonatal population.

AIM

The purpose of this study was to test the hypothesis that mechanical vibration would be efficacious in the relief of pain associated with heel sticks in neonates. Heel sticks are one of the most common painful procedures during neonatal hospitalization.

STUDY DESIGN

A random-sequencing crossover design was used with infants acting as their own controls.

SUBJECTS

Newborn infants of 35 weeks' gestation or greater (N = 20) met the inclusion criteria for the study.

OUTCOME MEASURES

Pain during heel stick was measured with the Neonatal Infant Pain Scale. The Neonatal Infant Pain Scale is a nonintrusive tool with extensive evidence of its reliability and validity in the neonatal population, when used by trained observers.

RESULTS

Mechanical vibration produced an analgesic effect for infants who had previously experienced painful heel sticks that approached statistical significance.

CONCLUSIONS

The apparent limitations of mechanical vibration as analgesia may be due to the concurrent use of sucrose and pacifier, the effects of order (ie, habituation), or type II error. Because vibration produced the predicted positive effect in some circumstances, further investigation in larger samples within a randomized clinical trial is warranted.

Long-term impact of neonatal injury in male and female rats: Sex differences, mechanisms and clinical implications

Over the last several decades, the relative contribution of early life events to individual disease susceptibility has been explored extensively. Only fairly recently, however, has it become evident that abnormal or excessive nociceptive activity experienced during the perinatal period may permanently alter the normal development of the CNS and influence future responses to somatosensory input. Given the significant rise in the number of premature infants receiving high-technology intensive care over the last 20 years, ex-preterm neonates may be exceedingly vulnerable to the long-term effects of repeated invasive interventions. The present review summarizes available clinical and laboratory findings on the lasting impact of exposure to noxious stimulation during early development, with a focus on the structural and functional alterations in nociceptive circuits, and its sexually dimorphic impact.

A vibração torácica na fisioterapia respiratória de recém-nascidos causa dor?

OBJETIVO: Avaliar a dor em recém-nascidos pré-termo (RNPT) submetidos à fisioterapia respiratória em Unidade de Terapia Intensiva Neonatal. MÉTODOS: Estudo transversal realizado com recém-nascidos prematuros, com indicação de fisioterapia respiratória, em respiração espontânea. Foi aplicada uma técnica de vibração torácica com a mão do terapeuta realizando pequenas oscilações sobre o tórax do paciente e feita a avaliação da frequência cardíaca (FC), frequência respiratória (FR), saturação de pulso de oxigênio (SpO2) e do Sistema de Codificação da Atividade Facial Neonatal (NFCS) para a avaliação da dor antes, durante, imediatamente após (pós-i) e 30 minutos após (pós-30) a vibração no tórax do paciente. Utilizou-se a análise de variância para medidas repetidas para comparação entre as fases, considerando-se significante p<0,05. RESULTADOS: Foram avaliados 13 RNPT, com média de idade gestacional 32,5±2,0 semanas e peso de nascimento 1830±442g. Não foi observada pontuação de dor durante toda a avaliação: pré: 0,5±1,7; durante: 1,5±1,4; pós-i: 1,0±1,3; pós-30: 0±0,3, porém houve diferença estatisticamente significativa entre a fase pós-i e pós-30 na escala NFCS (p<0,05). A FC variou de 120 a 150bpm, a SpO2 permaneceu acima de 95%, e a FR entre 40 e 62rpm, sem diferenças entre os períodos. CONCLUSÕES: Neste grupo de pacientes prematuros internados em UTI neonatal e submetidos à realização de fisioterapia respiratória pela técnica de vibração torácica, não foram observadas alterações fisiológicas e comportamentais de dor

Pain management during eye examinations for retinopathy of prematurity in preterm infants: a systematic review

AIM

To assess whether non-pharmacological and/or pharmacological measures lead to decreased pain during an eye examination in preterm infants.

METHODS

.

DESIGN

Systematic review.

SUBJECTS

Premature infants meeting the criteria for screening eye examination for retinopathy.

INTERVENTION

Databases were searched through the Ovid interface. Randomized and quasi-randomized controlled trials were included. Data were assessed independently by three reviewers.

MAIN OUTCOME MEASURES

Pain assessed by Premature Infant Pain Profile (PIPP) or physiological changes.

RESULTS

Eight studies were included and grouped according to intervention: oral sucrose (group 1), anaesthetic eye drops (group 2) and non-pharmacological measures (group 3). For group 1, the mean PIPP score with sucrose was 1.38 (WMD) (95% CI: 0.41-2.35) lower than that of placebo (p = 0.005). For group 2, one study showed a reduction of two points on the PIPP score with topical proparacaine, whereas another showed no benefit. For group 3, developmental care improved developmental scores and salivary cortisol in one study.

CONCLUSION

Sucrose reduced pain during the eye examination, whereas the efficacy of proparacaine was not consistent in the studies included. However, PIPP scores remained relatively high in all the studies; thus further research is required to delineate better pain reduction strategies.

Neonatal pain: a comparison of the beliefs and practices of junior doctors and current best evidence

AIM

To obtain information on the practices and beliefs of junior doctors regarding neonatal pain and to compare this with best evidence.

METHODS

A survey was distributed to junior doctors in five tertiary neonatal intensive care units in Sydney. Questions investigated the doctors' knowledge and treatment of pain in neonates, specifically regarding the perception and effects of pain, pain assessment tools, and the safety and efficacy of treatments for both procedural and long-term pain.

RESULTS

The survey was completed by 33 junior doctors (77% response rate). Respondents generally had adequate knowledge about the effects of pain in neonates; however, a low proportion of respondents acknowledged the difference in long-term effects between neonates and older children. Less experienced doctors were especially unaware of this. Pain assessment tools were not perceived to be reliable, valid or routinely used, especially by less experienced doctors. Respondents were appropriately unsupportive of the use of topical anaesthetic agents. Participants acknowledged the efficacy breastfeeding and oral sucrose during short-term procedures but skin-to-skin contact and massage were less recognised as useful. Mixed opinions were noted on the benefits and risks of use of opioid analgesics, morphine infusions and midazolam but most agreed that sedation does not necessarily provide adequate pain relief. Disturbingly, doctors who were aware of the Royal Australasian College of Physicians Guidelines were more likely to agree with the routine use of midazolam in neonates.

CONCLUSIONS

Increased educational programmes should be developed to improve the knowledge of junior doctors regarding neonatal pain.

Heel-lancing in newborns: behavioral and spectral analysis assessment of pain control methods

OBJECTIVE

Pain experience can alter clinical outcome, brain development, and subsequent behavior in newborns, primarily in preterm infants. The aims of this study were (1) to evaluate several simple, commonly used methods for pain control in newborns and (2) to evaluate the concordance between behavioral and autonomic cardiac reactivity to pain in term neonates during heel-lancing.

METHODS

A prospective study was conducted of 180 term newborn infants who were undergoing heel-lancing for routine neonatal screening of phenylketonuria and hypothyroidism. Newborns were assigned to 6 groups: (1) control (no pain relief intervention); (2) nonnutritive sucking; (3) holding by mother; (4) oral glucose solution; (5) oral formula feeding; or (6) breastfeeding. Outcome measures included the Neonatal Facial Coding System score; cry duration; and autonomic variables obtained from spectral analysis of heart rate variability before, during, and after heel-lancing.

RESULTS

Infants with no pain control showed the highest pain manifestation compared with newborns to whom pain control was provided. Infants who breastfed or received an oral formula showed the lowest increase in heart rate (21 and 23 beats per minute, respectively, vs 36; P < .01), lowest neonatal facial score (2.3 and 2.9, respectively, vs 7.1; P < .001), lowest cry duration (5 and 13 seconds, respectively, vs 49; P < .001), and lowest decrease in parasympathetic tone (-2 and -2.4, respectively, vs 1.2; P < .02) compared with the other groups.

CONCLUSIONS

Any method of pain control is better than none. Feeding and breastfeeding during heel-lancing were found to be the most effective methods of pain relief.

Visceral pain: the neurophysiological mechanism

The mechanism of visceral pain is still less understood compared with that of somatic pain. This is primarily due to the diverse nature of visceral pain compounded by multiple factors such as sexual dimorphism, psychological stress, genetic trait, and the nature of predisposed disease. Due to multiple contributing factors there is an enormous challenge to develop animal models that ideally mimic the exact disease condition. In spite of that, it is well recognized that visceral hypersensitivity can occur due to (1) sensitization of primary sensory afferents innervating the viscera, (2) hyperexcitability of spinal ascending neurons (central sensitization) receiving synaptic input from the viscera, and (3) dysregulation of descending pathways that modulate spinal nociceptive transmission. Depending on the type of stimulus condition, different neural pathways are involved in chronic pain. In early-life psychological stress such as maternal separation, chronic pain occurs later in life due to dysregulation of the hypothalamic-pituitary-adrenal axis and significant increase in corticotrophin releasing factor (CRF) secretion. In contrast, in early-life inflammatory conditions such as colitis and cystitis, there is dysregulation of the descending opioidergic system that results excessive pain perception (i.e., visceral hyperalgesia). Functional bowel disorders and chronic pelvic pain represent unexplained pain that is not associated with identifiable organic diseases. Often pain overlaps between two organs and approximately 35% of patients with chronic pelvic pain showed significant improvement when treated for functional bowel disorders. Animal studies have documented that two main components such as (1) dichotomy of primary afferent fibers innervating two pelvic organs and (2) common convergence of two afferent fibers onto a spinal dorsal horn are contributing factors for organ-to-organ pain overlap. With reports emerging about the varieties of peptide molecules involved in the pathological conditions of visceral pain, it is expected that better therapy will be achieved relatively soon to manage chronic visceral pain.

Decreased opioid analgesia in weanling rats exposed to endothelin-1 during infancy

Endothelin-1 produces spontaneous nociceptive-associated behaviors that are modulated by the peripheral opioid system. The present study tests the hypothesis that single or repeated exposure to endothelin-1 during infancy decreases opioid analgesia in weanling rats. Morphine analgesia was measured in male and female postnatal day 21 rats following intraplantar endothelin-1 on postnatal day 7, or 11 or both days 7 and 11. In males, exposure to endothelin-1 on postnatal day 11 or both days 7 and 11 produced a statistically significant decrease in morphine analgesia (EC(50)=0.902 and 1.326mg/kg, respectively) compared to control (EC(50)=0.486mg/kg). Similarly in females, exposure to endothelin-1 on postnatal day 11 or both days 7 and 11 produced a statistically significant decrease in morphine analgesia (EC(50)=1.367 and 1.226mg/kg, respectively) compared to control (EC(50)=0.468mg/kg). In addition, females exposed to endothelin-1 on postnatal day 7 exhibited an intermediate decrease in morphine analgesia with an EC(50) of 0.752mg/kg. In males, exposure to endothelin-1 decreased mu opioid receptor expression without changing endothelin-A receptor or endothelin-B receptor expression in the hindpaw skin. In contrast, in females, exposure to endothelin-1 increased expression of both endothelin receptors and the mu opioid receptor in hindpaw skin. These findings suggest a sex-difference in the window of vulnerability and the mechanism by which an acute nociceptive event can induce morphine tolerance.

Salivary cortisol and administration of concentrated oral glucose in newborn infants: improved detection limit and smaller sample volumes without glucose interference

Newborn infants are subject to repetitive painful and stressful events during neonatal intensive care. When the baby attempts to cope with a stressful situation the hypothalamus-pituitary-adrenal axis is activated, releasing cortisol. The free cortisol response is optimally measured in saliva and saliva samples can be taken easily and without pain. However, saliva is very scarce in infants and saliva stimulants can interfere with analytical methods. Nowadays, sweet solutions are frequently administered to neonates prior to a disturbing procedure in order to reduce pain. The possible interference of sweet solutions with the measurement of salivary cortisol has not yet been documented. The aims of the present study were to further improve the detection limit of the radioimmunoassay used for cortisol analysis and to determine the degree of interference of high concentrations of glucose with the analytical method. By decreasing incubation temperature and prolonging the incubation time it was possible to improve the detection limit of the radio immunoassay (RIA) to 0.5 nmol/L at the same time as the sample volume was decreased to 10 microL saliva. Saliva was collected from full-term and preterm babies and was sufficient for analysis in 113 out of 116 (97%) samples. Glucose in the concentrations and amounts commonly used for pain relief did not interfere with the RIA method. In conclusion, it is feasible to collect microlitre volumes of saliva and analyse even very low concentrations of cortisol in newborns. It is also possible to offer the baby oral glucose prior to a painful procedure and still reliably measure salivary cortisol.

Clinical practice: analgesia in neonates

Effective management of pain remains an important indicator of the quality of care provided to neonates. Since the review of McIntosh in this journal over a decade ago, an extensive number of papers on assessment, prevention, and treatment of pain have been reported. In addition, preclinical insights into neurodevelopmental aspects of pain processing and the neuro-apoptotic effects of analgesics and sedatives were unveiled. Based on the newly collected evidence, the practice of "one-drug, one dose and one treatment fits all" became obsolete, necessitating a more individualized analgesia, based on non-pharmacological and pharmacological therapies and preventive strategies for effective management of neonatal pain. The progress made is impressive, but the current major challenge is to implement the available knowledge in clinical care. Future research should therefore focus on the evaluation of the effectiveness of non-opioid and moderately potent opioids compared to morphine and should also describe the methods to facilitate effective implementation. Finally, there is an extensive field of procedural techniques that need to be evaluated on their pain related response.

The behavioral pain response to heelstick in preterm neonates studied longitudinally: description, development, determinants, and components

OBJECTIVES

Preterm infants often experience multiple painful procedures during their stay in neonatal intensive care units (NICUs). The objectives of this study were to evaluate behavioral responses to heelstick in preterm newborns, characterize developmental changes and the effects of other demographic and clinical variables on the pain response, and estimate the contributions of individual Neonatal Infant Pain Scale (NIPS) behaviors to the summary pain score.

METHODS

A longitudinal study was conducted to evaluate the behavioral responses of 35 preterm newborns to multiple heelstick procedures during their stay in the NICU. Sixty-one video recordings of blood collection by heel lance were evaluated for behavioral pain response using the NIPS. Generalized linear mixed models were calculated to address the study objectives.

RESULTS

The increases in NIPS scores from the baseline to the blood draw were highly significant (mean baseline score=3.34, mean blood draw score=5.45, p<0.001). The newborns' pain responses increased an average of 0.23 points on the NIPS scale each week (p=0.002). Lower NIPS scores during the heelstick procedure were associated with four clinical variables: younger post-menstrual age at birth, lower birthweight, mechanical ventilation, and longer length of stay in the NICU. Crying, arousal state, and facial grimace contributed more than 85% of the increase in NIPS scores during the heelstick procedure.

DISCUSSION

While behavioral responses to pain are attenuated in young, severely ill preterm newborns, they can be reliably detected. The most robust pain behaviors are crying, changes in arousal state, and facial grimacing.

Rapid sequence intubation in the neonate

Rapid sequence intubation (RSI) is premedication prior to intubation that includes atropine, a sedative, and a neuromuscular blockage. Rapid sequence intubation is infrequently performed in neonates despite evidence that it is safe and effective. Neonates that experience endotracheal intubation often display apnea and cardiac arrhythmias, decreased or obstructed nasal airflow, increased systolic blood pressure, and decreased heart rate and transcutaneous oxygen tension. Infants can also experience increased anterior fontanel pressure, which can place them at greater risk for intraventricular hemorrhage. Rapid sequence intubation has been shown to facilitate better intubation conditions including no movement from the infant and better visualization of the airway. Infants receiving RSI were successfully intubated twice as fast as infants who were not premedicated. Infants with premedication also had fewer changes in baseline heart rate. Neonatal RSI can be easily and safely performed in the neonate. Knowledge and skill allow for the best conditions when intubating the infant. Future research must focus on the best combination of medications for RSI in the neonate.