Determining behavioural and physiological responses to pain in infants at risk for neurological impairment

Acoustic Cry Characteristics of Infants as a Marker of Neurological Dysfunction: A Systematic Review and Meta-Analysis

BACKGROUND

Atypical cries have been identified in infants with neurological dysfunction. The aim of this study was to conduct a systematic review and meta-analysis to appraise existing evidence for associations between acoustic cry characteristics and neurological dysfunction in infants aged 18 months or less.

METHODS

PubMed/MEDLINE, PsycINFO, CINAHL, and Embase were searched for original, peer-reviewed studies published in English reporting cry variables in infants aged 18 months or less with or at risk of neurological dysfunction. Studies without a nonneurologically impaired control sample were excluded. Pooled effect sizes were estimated using standardized mean difference (SMD) and odds ratio (OR). I² indicated study heterogeneity, and the risk of bias was assessed using the Newcastle-Ottawa Scale.

RESULTS

From March 2018 to February 2019, 28,294 studies were retrieved. Eight were meta-analyzed. Infants with or at risk of neurological dysfunction exhibited higher mean (SMD = 0.11 [95% confidence interval, 0.00 to 0.23]) and minimum (SMD = 0.93 [0.64 to 1.23]) fundamental frequency; higher odds of hyperphonation (OR = 13.17 [1.05 to 165.87]), biphonation (OR = 10.62 [1.53 to 73.59]), rise-fall-rise melodies (OR = 4.66 [1.16 to 18.66]), and flat melodies (OR = 4.47 [1.27 to 15.68]); and lower odds of fall-rise-fall melodies (OR = 0.21 [0.05 to 0.83]).

CONCLUSIONS

Infants with underlying neuropathology have unique cries characterized by higher fundamental frequency, dysphonation, and atypical melodies, although study heterogeneity and imprecision of effect size estimates limited our interpretation. Assessment of acoustic cry characteristics offers the potential for noninvasive, rapid, point-of-care screening for neurologically high-risk infants.

Understanding early-life pain and its effects on adult human and animal emotionality: Translational lessons from rodent and zebrafish models

Critical for organismal survival, pain evokes strong physiological and behavioral responses in various sentient species. Clinical and preclinical (animal) studies markedly increase our understanding of biological consequences of developmental (early-life) adversity, as well as acute and chronic pain. However, the long-term effects of early-life pain exposure on human and animal emotional responses remain poorly understood. Here, we discuss experimental models of nociception in rodents and zebrafish, and summarize mounting evidence of the role of early-life pain in shaping emotional traits later in life. We also call for further development of animal models to probe the impact of early-life pain exposure on behavioral traits, brain disorders and novel therapeutic treatments.

Neonatal heart rate variability: a contemporary scoping review of analysis methods and clinical applications

BACKGROUND

Neonatal heart rate variability (HRV) is widely used as a research tool. However, HRV calculation methods are highly variable making it difficult for comparisons between studies.

OBJECTIVES

To describe the different types of investigations where neonatal HRV was used, study characteristics, and types of analyses performed.

ELIGIBILITY CRITERIA

Human neonates ≤1 month of corrected age.

SOURCES OF EVIDENCE

A protocol and search strategy of the literature was developed in collaboration with the McGill University Health Center's librarians and articles were obtained from searches in the Biosis, Cochrane, Embase, Medline and Web of Science databases published between 1 January 2000 and 1 July 2020.

CHARTING METHODS

A single reviewer screened for eligibility and data were extracted from the included articles. Information collected included the study characteristics and population, type of HRV analysis used (time domain, frequency domain, non-linear, heart rate characteristics (HRC) parameters) and clinical applications (physiological and pathological conditions, responses to various stimuli and outcome prediction).

RESULTS

Of the 286 articles included, 171 (60%) were small single centre studies (sample size <50) performed on term infants (n=136). There were 138 different types of investigations reported: physiological investigations (n=162), responses to various stimuli (n=136), pathological conditions (n=109) and outcome predictor (n=30). Frequency domain analyses were used in 210 articles (73%), followed by time domain (n=139), non-linear methods (n=74) or HRC analyses (n=25). Additionally, over 60 different measures of HRV were reported; in the frequency domain analyses alone there were 29 different ranges used for the low frequency band and 46 for the high frequency band.

CONCLUSIONS

Neonatal HRV has been used in diverse types of investigations with significant lack of consistency in analysis methods applied. Specific guidelines for HRV analyses in neonates are needed to allow for comparisons between studies.

A Systematic Review of Assessments and Interventions for Chronic Pain in Young Children With or at High Risk for Cerebral Palsy

BACKGROUND

Pain is common in children with cerebral palsy. The purpose of this systematic review was to evaluate the evidence regarding assessments and interventions for chronic pain in children aged ≤2 years with or at high risk for cerebral palsy.

METHODS

A comprehensive literature search was performed. Included articles were screened using PRISMA guidelines and quality of evidence was reviewed using best-evidence tools by independent reviewers. Using social media channels, an online survey was conducted to elicit parent preferences.

RESULTS

Six articles met criteria. Parent perception was an assessment option. Three pharmacologic interventions (gabapentin, medical cannabis, botulinum toxin type A) and 1 nonpharmacologic intervention were identified. Parent survey report parent-comfort and other nonpharmacologic interventions ranked as most preferable.

CONCLUSION

A conditional GRADE recommendation was in favor of parent report for pain assessment. Clinical trials are sorely needed because of the lack of evidence for safety and efficacy of pharmacologic interventions.

Exploration and Validation of Behavioral Pain Measures and Physiological Pain Measures Factor Structure Extracted From the Pain Assessment Tool Item Scores for Infants Admitted to Neonatal Intensive Care

OBJECTIVE

The objective of the study was to explore and then validate the factor structure of the Pain Assessment Tool (PAT).

MATERIALS AND METHODS

A retrospective medical record review was performed of all infants who were admitted to a neonatal intensive care unit between 2008 and 2018 and had 1 PAT assessment (n=2111). Scores on items of the PAT were collected. Infants were randomized to either the principal component analysis (n=1100) to explore the factor structure or confirmatory factor analysis (n=1011).

RESULTS

Infants in the 2 samples were demographically comparable. A 2-factor model, consisting of factors Behavioral and Physiological Pain Measures, was extracted, explaining 39.8% of the total variance. There was a low interfactor correlation (r=0.12), and both Behavioral (r=0.59) and Physiological Pain (r=0.37) Measures factor scores were correlated with nurses' perception of pain scores. When the frequencies in the gestational age at birth categories were compared between upper and lower quartile score infants, there was more with pain at preterm than at term (χ2(3)=44.9, P<0.001) for the Physiological Pain Measures factor, whereas Behavioral Pain Measures frequency was higher at term than at preterm (χ2(3)=8.1, P<0.043). A similar pattern was observed for postmenstrual age at assessment categories: Behavioral Pain Measures (χ2(3)=41.8, P<0.001) Physiological Pain Measures (χ2(3)=46.1, P<0.001). The 2-factor correlated model performed better at explaining the observed variances: (χ2(13)=41.6, P<0.001) compared with rival models.

DISCUSSION

The PAT assesses both Behavioral Pain and Physiological Pain Measures, and these dimensions need to be considered separately when assessing pain in infants in the neonatal intensive care unit. Behavioral item scores may be insufficient for detecting pain in premature infants if used alone.

Neonatal Pain, Agitation, and Sedation Scale's use, reliability, and validity: a systematic review

The Neonatal Pain, Agitation, and Sedation Scale (N-PASS) is recommended by the American Academy of Pediatrics to measure neonatal pain and sedation. However, little is known regarding its reliability and validity for diverse neonatal subpopulations. Twenty-nine studies were included in our review, demonstrating broad application of N-PASS and good or excellent reliability and validity for various neonatal subpopulations. Our systematic review found N-PASS to be valid and reliable for many but not all neonatal subpopulations. There is a lack of support for N-PASS reliability and validity for measuring prolonged pain and sedation in nonmechanically ventilated infants and for acute pain in postoperative infants in any gestational age category. Overall, N-PASS is a psychometrically sound and pragmatic instrument evaluating pain and sedation for most neonatal populations. Future research using N-PASS is encouraged to evaluate and report its validity and reliability, especially for neonatal subpopulations not included in this review.

Associations Between Neonatal Cry Acoustics and Visual Attention During the First Year

It has been suggested that early cry parameters are connected to later cognitive abilities. The present study is the first to investigate whether the acoustic features of infant cry are associated with cognitive development already during the first year, as measured by oculomotor orienting and attention disengagement. Cry sounds for acoustic analyses (fundamental frequency; F0) were recorded in two neonatal cohorts at the age of 0–8 days (Tampere, Finland) or at 6 weeks (Cape Town, South Africa). Eye tracking was used to measure oculomotor orienting to peripheral visual stimuli and attention disengagement from central stimuli at 8 months (Tampere) or at 6 months (Cape Town) of age. Only a marginal positive correlation between fundamental frequency of cry (F0) and visual attention disengagement was observed in the Tampere cohort, but not in the Cape Town cohort. This correlation indicated that infants from the Tampere cohort with a higher neonatal F0 were marginally slower to shift their gaze away from the central stimulus to the peripheral stimulus. No associations between F0 and oculomotor orienting were observed in either cohort. We discuss possible factors influencing the current pattern of results suggesting a lack of replicable associations between neonatal cry and visual attention and suggest directions for future research investigating the potential of early cry analysis in predicting later cognitive development.

Systematic review and meta-analysis suggest that varying prevalence of non-acute pain in critically ill infants may be due to different definitions

AIM

Our aim was to quantify the prevalence of non-acute pain in critically ill infants and to identify how non-acute pain was described, defined and assessed.

METHODS

This systematic review and meta-analysis used multiple electronic databases to search for papers published in any language to March 2018: 2029 papers were identified, and 68 full texts were screened. Studies reporting the prevalence of non-acute pain in infants younger than 2 years and admitted to critical care units were included. The extracted data included the use of non-acute pain descriptions, definitions and pain assessment tools.

RESULTS

We included 11 studies published between 2002 and 2018 that comprised 1204 infants from Europe, the USA, Canada and India. They were prospective observational (n = 7) and retrospective observational (n = 1) studies and randomised controlled trials (n = 3). The prevalence of non-acute pain was 0%-76% (median 11%). Various pain assessment tools were used, and only two could be pooled. This gave a pooled prevalence of 3.7%-39.8%. A number of different descriptors were used for non-acute pain, and all of these were poorly defined.

CONCLUSION

The prevalence of non-acute pain in infants admitted to critical care units varied considerably. This could have been because all the studies used different definitions of non-acute pain.

Automatic Infants' Pain Assessment by Dynamic Facial Representation: Effects of Profile View, Gestational Age, Gender, and Race

Infants' early exposure to painful procedures can have negative short and long-term effects on cognitive, neurological, and brain development. However, infants cannot express their subjective pain experience, as they do not communicate in any language. Facial expression is the most specific pain indicator, which has been effectively employed for automatic pain recognition. In this paper, dynamic pain facial expression representation and fusion scheme for automatic pain assessment in infants is proposed by combining temporal appearance facial features and temporal geometric facial features. We investigate the effects of various factors that influence pain reactivity in infants, such as individual variables of gestational age, gender, and race. Different automatic infant pain assessment models are constructed, depending on influence factors as well as facial profile view, which affect the model ability of pain recognition. It can be concluded that the profile-based infant pain assessment is feasible, as its performance is almost as good as that of the whole face. Moreover, gestational age is the most influencing factor for pain assessment, and it is necessary to construct specific models depending on it. This is mainly because of a lack of behavioral communication ability in infants with low gestational age, due to limited neurological development. To our best knowledge, this is the first study investigating infants' pain recognition, highlighting profile facial views and various individual variables.

Fundamental Frequency Variation of Neonatal Spontaneous Crying Predicts Language Acquisition in Preterm and Term Infants

Spontaneous cries of infants exhibit rich melodic features (i.e., time variation of fundamental frequency [F0 ]) even during the neonatal period, and the development of these characteristics might provide an essential base for later expressive prosody in language. However, little is known about the melodic features of spontaneous cries in preterm infants, who have a higher risk of later language-related problems. Thus, the present study investigated how preterm birth influenced melodic features of spontaneous crying at term-equivalent age as well as how these melodic features related to language outcomes at 18 months of corrected age in preterm and term infants. At term, moderate-to-late preterm (MLP) infants showed spontaneous cries with significantly higher F0 variation and melody complexity than term infants, while there were no significant differences between very preterm (VP) and term infants. Furthermore, larger F0 variation within cry series at term was significantly related to better language and cognitive outcomes, particularly expressive language skills, at 18 months. On the other hand, no other melodic features at term predicted any developmental outcomes at 18 months. The present results suggest that the additional postnatal vocal experience of MLP preterm infants increased F0 variation and the complexity of spontaneous cries at term. Additionally, the increases in F0 variation may partly reflect the development of voluntary vocal control, which, in turn, contributes to expressive language in infancy.

Non-pharmacological management of neonatal pain: Research and clinical practice in the Neonatal Intensive Care Unit

Abstract According to the World Health Organization and the International Association for the Study of Pain, pain is a relevant worldwide problem in the healthcare field. The present study aimed to describe the definition of pediatric pain and the main characteristics, and to examine the findings regarding the impact of pain on the development of the child. The best clinical practices in Neonatal Intensive Care Units should include developmental care and specifically implement pain management, aiming to protect the health and development of the infants. The efficacious non-pharmacological management of neonatal pain includes breastfeeding, skin-to-skin, non-nutritive sucking, facilitated-tucking and swaddling. Sweet solutions also have pain relief effects. Psychologists could actively participate in the implementation of non-pharmacological interventions and in the whole process to sensitize and train the professional teams, to alert parents to protection against pain and to support policymakers in the implementation of pain guidelines in the hospital.

Assessment and management of pain in pediatric otolaryngology

INTRODUCTION

Pain is a disease by itself and it's a public health concern of major implication in children, not just because of the emotional component of the child and his family, but also due to the potential morbidity and mortality involving it. A proper assessment of pain it's a challenge in the pediatric population, due to their lack of understanding and verbalization of hurt. Additionally, a satisfactory treatment of pediatric pain can be arduous due to a lack of clinical knowledge, insufficient pediatric research, and the fear to opioid side effects and addiction.

OBJECTIVES

The aim of this review is to address the current definitions of pain, its physiological mechanisms and the consequences of its inadequate management, as well as, to guide the clinicians in the assessment and management of pain in the pediatric population at otolaryngology services.

METHODOLOGY

Narrative review by selective MeSH search terms: Children, Pediatrics, Otolaryngology, Pain measurement, Pain Management, Analgesics and Analgesia, from databases: MEDLINE/PubMed, Cochrane, ISI, Current Contents, Scielo and LILACS, between January 2000 and May 2016.

RESULTS

129 articles were reviewed according to the requirements of the objectives. Pain measurement is a challenge in children as there are no physical signs that constitute an absolute or specific indicator of pain, and its diagnosis must rely on physiological, behavioral and self-report methods. Regarding treatment, a suitable alternative are the non-pharmacological cognitive/behavioral therapies helped by pharmacological therapies tailored to the severity of pain and the child's age. We provide evidence-based recommendations on pain treatment, including non-opioid analgesics, opioid analgesics and adjuvant medicines to improve the management of pain in children in otolaryngology services.

CONCLUSIONS

We present a global review about assessment and management of pain in pediatric otolaryngology, which leads to future specific reviews on each topic. Research gaps on pain assessment and pharmacological interventions in neonates, infants and children are very wide and it should be promoted ethical and safe research on pain control in this population.

Development of Accumulated Pain/Stressor Scale (APSS) in NICUs: A National Survey

High-risk neonates experience numerous painful/stressful procedures daily in neonatal intensive care units (NICUs). Accumulated pain and stress have a detrimental impact on infants' neurodevelopment. Few valid tools are available to measure accumulated pain/stressors among NICU infants. The aim of this study was to obtain nurses' perceptions about severity and acuity levels regarding each painful/stressful procedure that infants may experience in the NICU. The data will support developing a new instrument, the Accumulated Pain/Stressor Scale (APSS) in NICUs. A nationwide online survey was conducted through the U.S. National Association of Neonatal Nurses membership. Respondents were asked to rate the perceived severity of pain/stress associated with 68 procedures using a 5-point Likert scale and to categorize pain/stress as acute or chronic. Modal values were used to determine summary rankings among the procedures. Eighty-four neonatal nurses completed the survey. Among 68 procedures, nearly all were rated as painful/stressful to some degree. Five procedures (7%) had a modal value of five (extremely painful/stressful), nine (14%) had a value of four, 20 (29%) had a value of three, 30 (44%) a value of two, and four (6%) had a value of one (not painful/stressful). Forty-four procedures (65%) were perceived as acute, six (9%) as chronic, and 18 (26%) as both acute and chronic. Nurses' perceptions of pain severity and acuity regarding procedures in NICUs varied somewhat. Further studies are needed in developing and validating the scale. The development of the APSS can quantitatively measure the accumulated neonatal pain/stress.

Associations between respiratory arrhythmia and fundamental frequency of spontaneous crying in preterm and term infants at term-equivalent age

This study investigated whether lower vagal function in preterm infants is associated with increased fundamental frequency (F₀; frequency of vocal fold vibration) of their spontaneous cries. We assessed respiratory sinus arrhythmia (RSA) during quiet sleep as a measure of vagal function, and its relationship with the F₀ of spontaneous cries in healthy preterm and term infants at term‐equivalent age. The results showed that preterm infants have significantly lower RSA, and higher overall F₀ than term infants. Moreover, lower RSA was associated with higher overall F₀ in preterm infants, whereas higher RSA was positively associated with mean and maximum F₀, and a larger F₀ range in term infants. These results suggest that individual differences in vagal function may be associated with the F₀ of spontaneous cries via modulation of vocal fold tension in infants at an early developmental stage. © 2016 The Authors. Developmental Psychobiology Published by Wiley Periodicals, Inc. Dev Psychobiol 58:724–733, 2016.

Neonatal pain and developmental outcomes in children born preterm: a systematic review

BACKGROUND

Neonates cared for in neonatal intensive care units are exposed to many painful and stressful procedures that, cumulatively, could impact later neurodevelopmental outcomes. However, a systematic analysis of these effects is yet to be reported.

OBJECTIVES

The aim of this research was to review empirical studies examining the association between early neonatal pain experiences of preterm infants and the subsequent developmental outcomes of these children across different ages.

METHODS

The literature search was performed using the PubMed, PsycINFO, Lilacs, and SciELO databases and included the following key words: "pain," "preterm," and "development." In addition, a complementary search was performed in online journals that published pain and developmental studies to ensure all of the target studies had been found. The data were extracted according to predefined inclusion and exclusion criteria.

RESULTS

Thirteen studies were analyzed. In infants born extremely preterm (gestational age ≤29 wk) greater numbers of painful procedures were associated with delayed postnatal growth, with poor early neurodevelopment, high cortical activation, and with altered brain development. In toddlers born very preterm (gestational age ≤32 wk) biobehavioral pain reactivity-recovery scores were associated with negative affectivity temperament. Furthermore, greater numbers of neonatal painful experiences were associated with a poor quality of cognitive and motor development at 1 year of age and changes in cortical rhythmicity and cortical thickness in children at 7 years of age.

CONCLUSIONS

For infants born preterm, neonatal pain-related stress was associated with alterations in both early and in later developmental outcomes. Few longitudinal studies examined the impact of neonatal pain in the long-term development of children born preterm.

Preterm infants' behaviors and skin conductance responses to nurse handling in the NICU

Stress response patterns are indicative of the neonate's unique ability to cope with environmental demands and can be evaluated through autonomic and behavioral response parameters.

OBJECTIVE

To characterize stress responses during tactile stimulation to standard nurse handling in the NICU, and their association with severity of illness in preterm infants.

METHODS

Thirty preterm neonates were studied at postnatal day 4-5 during standard nurse caregiving. Heart rate (HR), respiratory rate (RR), skin conductance responses per second (SCR/s), and NIDCAP® stress behaviors were recorded before and during care. Non-parametric tests were used to assess differences from before to during care. Pearson's correlations were used to determine the association of biological and behavioral variables to the score for neonatal acute physiology (SNAP), a severity of illness index.

RESULTS

HR, RR, SCR/s and NIDCAP® behaviors (motor and attentional cues, and ability to self-console) increased from before to during the care (p < 0.01). NIDCAP® behaviors showed a significant negative association to the SNAP score (R = -0.45, p < 0.05).

CONCLUSIONS

HR, RR, SCR/s and NIDCAP® behaviors significantly increased during care. NIDCAP® stress behaviors were influenced by the severity of illness of the infant, while SCR/s was not influenced by severity of illness.

Pain in Intellectually Disabled Children: Towards Evidence-Based Pharmacotherapy?

This critical opinion article deals with the challenges of finding the most effective pharmacotherapeutic options for the management of pain in intellectually disabled children and provides recommendations for clinical practice and research. Intellectual disability can be caused by a wide variety of underlying diseases and may be associated with congenital anomalies such as cardiac defects, small-bowel obstructions or limb abnormalities as well as with comorbidities such as scoliosis, gastro-esophageal reflux disease, spasticity, and epilepsy. These conditions themselves or any necessary surgical interventions are sources of pain. Epilepsy often requires chronic pharmacological treatment with antiepileptic drugs. These antiepileptic drugs can potentially cause drug-drug interactions with analgesic drugs. It is unfortunate that children with intellectual disabilities often cannot communicate pain to caregivers. Although these children are at high risk of experiencing pain, researchers nevertheless often have to exclude them from trials on pain management because of ethical considerations. We therefore make a plea for prescribers, researchers, patient organizations, pharmaceutical companies, and policy makers to study evidence-based, safe and effective pharmacotherapy in these children through properly designed studies. In the meantime, parents and clinicians must resort to validated pain assessment tools such as the revised FLACC scale.

The Effects of Instrumental Touching on Infant Pain Perception and the Effects of Eutectic Mixture of Local Anesthetics (EMLA) on the Reduction of Pain

Background:

Premature infants, who have to spend the first week of their lives in neonatal intensive care units (NICUs), experience pain and stress in numerous cases, and they are exposed to many invasive interventions. The studies have shown that uncontrolled pain experienced during early life has negative and long-term side effects, such as distress, and such experiences negatively affect the development of the central nervous system

Objectives:

The purpose of the study was to examine the effects of touching on infant pain perception and the effects of eutectic mixture of local anesthetic (EMLA) on the reduction of pain.

Patients and Methods:

Data for the study were collected between March and August 2012 from the neonatal clinic of a university hospital located in eastern Turkey. The population of the study consisted of premature infants who were undergoing treatment, completed the first month and who were approved for Hepatitis B vaccine. The study consisted of two experimental groups and one control group. Information forms, intervention follow-up forms, and Premature Infant Pain Profile (PIPP) were used to collect the data. EMLA cream was applied on the vastus lateralis muscles of the first experimental group before the vaccination. The second experimental group was vaccinated by imitation (placebo), without a needle tip or medicine. Vaccination was carried out using instrumental touch in this group. A routine vaccination was applied in the control group.

Results:

Mean pain scores of the group to which EMLA was applied were lower in a statistically significant way (P < 0.05) compared to the pain scores of the other groups. Moreover, it was determined that even though invasive intervention was not applied to the newborns, the touching caused them to feel pain just as in the placebo group (P < 0.005).

Conclusions:

The results demonstrated that EMLA was an effective method for reducing pain in premature newborns, and the use of instrumental touch for invasive intervention stimulated the pain perception in the newborns.

Neonatal procedural pain can be assessed by computer software that has good sensitivity and specificity to detect facial movements

AIM

The difficulty in assessing pain during the neonatal period is one of the main obstacles for appropriate analgesia in intensive care units. The aim of this study was to develop and validate computer software to monitor neonatal facial movements of pain in real time.

METHODS

The software was developed in the Delphi integrated development environment and provides real-time image analysis during monitoring, based on image recognition of pain-related facial actions. To validate the software performance, facial images were obtained during the monitoring of 30 neonates who were subjected to painful procedures related to daily care management. Of the 5644 images identified and analysed by the software, 360 images - 12 per infant - were randomly selected and assessed by six healthcare professionals with experience of recognising neonatal pain.

RESULTS

The agreement between the examiners and the software assessment was excellent (κ = 0.975). The software exhibited 85% sensitivity and 100% specificity in detecting neutral facial expressions in the resting state and 100% sensitivity and specificity in detecting pain during painful procedures.

CONCLUSION

It is possible to assess neonatal procedural pain using computer software that has good sensitivity and specificity to detect facial movements.

Non-pharmacological methods for relief of discomfort and pain in newborns: a collective nursing construction

This is a convergent care study with the aim to build, together with the nursing staff, a proposal for care protocol based on non-pharmacological methods for discomfort and pain management in newborns admitted to a neonatal intensive care unit. The study was carried out in a neonatal intensive care unit of a university hospital with 16 nursing staff professionals. Data were collected in two stages: first, a reflective-educational process was performed and, afterwards, a participant observation during the different work shifts of the nursing staff. The care protocol proposal will enable the standardization of care strategies for pain management in newborns using non-pharmacological methods. Furthermore, it will contribute to provide better care in the neonatal unit, reducing pain and discomfort experienced during hospitalization, as well as resulting in fewer consequences and better quality of life for the newborns and their families.

A multidimensional approach to pain assessment in critically ill infants during a painful procedure

OBJECTIVES

Inferring the pain level of a critically ill infant is complex. The ability to accurately extract the appropriate pain cues from observations is often jeopardized when heavy sedation and muscular blocking agents are administered. Near-infrared spectroscopy is a noninvasive method that may provide the bridge between behavioral observational indicators and cortical pain processing. We aimed to describe regional cerebral and systemic hemodynamic changes, as well as behavioral reactions in critically ill infants with congenital heart defects during chest-drain removal after cardiac surgery.

METHODS

Our sample included 20 critically ill infants with congenital heart defects, less than 12 months of age, admitted to the cardiac intensive care unit after surgery.

RESULTS

Cerebral deoxygenated hemoglobin concentrations significantly differed across the epochs (i.e., baseline, tactile stimulus, noxious stimulus) (P=0.01). Physiological systemic responses and Face Leg Activity Cry Consolability (FLACC) pain scores differed significantly across the events (P<0.01). The 3 outcome measures were not found to be associated with each other. Mean FLACC pain scores during the painful procedure was 7/10 despite administration of morphine. Midazolam administration accounted for 36% of the variance in pain scores.

DISCUSSION

We demonstrated with a multidimensional pain assessment approach that significant cerebral, physiological, and behavioral activity was present in response to a noxious procedure in critically ill infants despite the administration of analgesic treatment. Considering that the sedating agent significantly dampened pain behaviors, assessment of cerebral hemodynamic in the context of pain seems to be an important addition.

Procedural pain in neonates in Australian hospitals: a survey update of practices

AIM

The study aims to determine whether there has been improved uptake of the evidence for the management of procedural pain in neonates throughout Australia.

METHODS

An Australian-wide survey was undertaken to determine the use of breastfeeding and sucrose and whether a clinical practice guideline (CPG) or pain assessment tool was used.

RESULTS

Data were available from 196 (91%) of the 215 eligible hospitals. A CPG informed the management of neonatal pain in 76 (39%) of the hospitals. There was wide variation in their use between the states, and a significantly higher use of a CPG in higher-level care units. A pain assessment tool was only used in 21 (11%) of the units with greater use in the higher level care neonatal intensive care units (50%) and surgical neonatal intensive care units (80%). Awareness of breastfeeding for procedural pain was reported by 90% of the 196 respondents while 78% reported that it was actually used. Awareness of sucrose for procedural pain was lower than breastfeeding at 79%, with 53% reporting that they used sucrose in their unit. Overall, 89% of the respondents reported that either breastfeeding or sucrose was used for the management of procedural pain in their units.

CONCLUSION

There has been an increase in awareness and use of sucrose and breastfeeding for procedural pain in Australia since previous surveys were undertaken in 2004. Continued resources, local pain champions and a national interest group to promote the use of pain management for procedural pain in neonates are needed for continued uptake of the evidence.

Update on pain assessment in sick neonates and infants

This article describes developments in pain assessment in critically ill neonates and infants during the last 5 to 6 years. Pain assessment instruments show a redundancy of items and a lack of profound psychometric background. Although most research focuses primarily on acute pain, in clinical practice there is also the challenge of assessing prolonged and/or persisting pain. The effectiveness of pain assessment is still a matter of debate and has recently been challenged as a primary end point in analgesia-related trials. Integration of observation of behavior with reliable and specific neurobiology-based parameters remains a challenge.

Emprego de soluções adocicadas no alívio da dor neonatal em recém-nascido prematuro: uma revisão integrativa

As experiências dolorosas repetida em recém-nascidos podem ter efeito a curto e a longo prazo, especialmente nos prematuros. Como uma medida de alívio da dor, tem sido recomendado o uso de soluções adocicadas em procedimentos dolorosos. Este estudo objetiva avaliar as evidências do efeito da sacarose e da glicose oral no alívio da dor aguda em recém-nascidos prematuros. Realizou-se uma revisão integrativa, nas bases de dados MEDLINE e LILACS, no período de 2005 a 2010, foram selecionados oito artigos. A análise destes revelou o efeito analgésico da glicose e da sacarose em procedimentos agudos. Nenhum efeito colateral foi encontrado nos recém-nascidos que receberam a glicose/sacarose. Ressalta-se a importância do uso da escala de avaliação da dor que mais se identifique com a população predominante nas unidades neonatais, que seja de fácil aplicação e manuseio pelos profissionais de saúde.

Closing the evidence-practice gap for newborn pain using clinical networks

AIM

The Australian New Zealand Neonatal Network undertook a project to close the evidence practice gap for the management of newborn pain in neonatal units within Australia. The aim was to establish a process for using evidence to support practice change and in doing so close the existing practice evidence gap for newborn pain.

METHOD

An implementation model using a clinical network with state facilitators, local champions and project teams was used in 24 tertiary units and six district hospitals throughout Australia. The process included audit and feedback, benchmarking, educational workshops on critical appraisal and audit of family awareness of pain. Multiple types of data were collected to enable changes in practices for pain management to be evaluated.

RESULTS

There was a 21% overall improvement in the number of infants receiving breastfeeding or sucrose for procedural pain, however, breastfeeding rates remain poorly utilised. The use of a pain assessment tool increased from 14% to 22%, with 56% of units introducing the use of an assessment tool into their practice. Families became more aware that their infant can experience pain and strategies to manage the pain (from 19% to 57%) project through distribution of information.

CONCLUSION

The networks for the uptake of evidence program have enabled the topic of procedure pain in neonates to be evaluated. We have shown that through a well planned program of coordination, facilitation and using local champions and project teams a change in practice can occur.

[Problems for assessing the newborns' pain in palliative care]

Several pain scales are available for newborns, but the assessment of pain in these preverbal beings, who are in continuing neurological development, remains challenging for healthcare teams. Although neonates at the end of life are particularly vulnerable to pain and discomfort, no assessment tool has been validated in this specific population. The difficulties for assessing pain in this context are copies of those potentially encountered in other situations. Questions arise about the limits of the available scales, about possible alterations of responses to a noxious stimulus in particular contexts (extreme immaturity, brain lesions), about possibly painful situations in palliative care, about the nature of scales to choose. Data show a perception of pain at a cortical level by extremely immature infants and the ability for neonates with significant neurological injury to express pain behaviours. For some potentially painful situations (dyspnoea, gasps, hunger) neonatal data are virtually nonexistent. Fundamental scientific data and clinical data from adults and children can give some answers. One will choose scales for which the staff is trained, easily usable (preference for behavioural scales), validated for all gestational ages, reliable in the event of neurological impairment or sedation. An assessment of prolonged pain (EDIN scale or COMFORT Behaviour scale) combined with measures of acute pain (DAN or NFCS scales) is recommended. These scales should be better validated for populations of newborns and situations that are specific to palliative care. A better assessment of the parental perception and of their distress about the discomfort or pain of their child is warranted.

Evidenced-based clinical practice guideline for management of newborn pain

AIM

To facilitate the uptake of evidence and to reduce the evidence practice gap for management of newborn pain through the development of a clinical practice guideline.

METHOD

An audit of practice and an appraisal of clinical practice guidelines were undertaken to establish current practices and guideline availability for the management of newborn pain in 23 hospitals in Australia. Guidelines were appraised using the Appraisal of Guidelines for Research and Evaluation instrument. A literature search was undertaken to acquire the evidence for best practice for management of newborn pain.

RESULTS

Neonatal units in 17 hospitals had clinical practice guidelines. Each was peer reviewed and assessed according to the domains of the Appraisal of Guidelines for Research and Evaluation instrument. There was lack of consistency across the guidelines. As a result, a best practice guideline was developed based on current best evidence and the Royal Australian College of Physicians recommendations. To facilitate an ongoing compliance with the guideline, an audit tool was included together with algorithms for procedural pain and pain assessment.

CONCLUSION

The clinical practice guideline can be used by clinicians in varying settings such as the neonatal intensive care and special care unit. The document can be used to support existing practices or challenge clinicians to close the evidence practice gap for the management of newborn pain.

Advanced neuroimaging techniques: their role in the development of future fetal and neonatal neuroprotection

Injury to the developing brain is associated with significant risk for potential lifelong, and wide-ranging neurodevelopmental consequences. Despite major advances in neonatal intensive care in recent decades, truly informed brain-oriented care of the critically ill neonate remains lacking. Consequently, this has hindered the development of preventive neuroprotective interventions, which is in large part due to the inherent difficulties in diagnosis, timing, and the severity of insults. Recent advances in understanding the cellular mechanisms of neonatal brain injury, together with the successful application of cutting-edge neuroimaging techniques, have markedly improved our understanding of the timing and evolution of structural injury to the immature brain, and its functional consequences. Triggered by these important advances, there is intense and renewed interest in the development of brain-oriented therapies, including neuroprotective strategies aimed at circumventing the injurious effects of neonatal brain insults. This article will provide an overview of normal and abnormal brain development, and explore the role of advanced neuroimaging techniques in neuroprotective therapies in the neonatal intensive care unit.

Kangaroo Care modifies preterm infant heart rate variability in response to heel stick pain: pilot study

BACKGROUND

Heel stick is the most common painful procedure for preterm infants in neonatal intensive care units. Resultant pain causes adverse physiological effects in major organ systems. Kangaroo Care (KC), involving mother-infant skin-to-skin contact is a promising analgesic for infant pain; however, the effect of KC on the autonomic nervous system's response to pain is unknown.

AIM

To determine if KC results in improved balance in autonomic responses to heel stick pain than the standard method where infants remain in an incubator care (IC) for the heel stick.

STUDY DESIGN

A randomized cross-over trial.

SUBJECTS

Fourteen preterm infants, 30-32 weeks gestational age and less than 9 days postnatal age.

OUTCOME MEASURES

Infant behavioral state, heart rate, heart rate variability (HRV) indices including low frequency (LF) and high frequency (HF) power, and the LF/HF ratio measured over Baseline, Heel Warming, Heel Stick, and Recovery periods in KC and IC conditions.

RESULTS

HRV differences between KC and IC were that LF was higher in KC at Baseline (p<.01) and at Heel Stick (p<.001), and HF was higher in KC at Baseline than in the IC condition (p<.05). The LF/HF ratio had less fluctuation across the periods in KC than in IC condition and was significantly lower during Recovery in KC than in IC (p<.001).

CONCLUSIONS

Infants experienced better balance in response in KC than IC condition as shown by more autonomic stability during heel stick. KC may be helpful in mediating physiologic response to painful procedures in preterm infants.

Assessing pain by facial expression: facial expression as nexus

The experience of pain is often represented by changes in facial expression. Evidence of pain that is available from facial expression has been the subject of considerable scientific investigation. The present paper reviews the history of pain assessment via facial expression in the context of a model of pain expression as a nexus connecting internal experience with social influence. Evidence about the structure of facial expressions of pain across the lifespan is reviewed. Applications of facial assessment in the study of adult and pediatric pain are also reviewed, focusing on how such techniques facilitate the discovery and articulation of novel phenomena. Emerging applications of facial assessment in clinical settings are also described. Alternative techniques that have the potential to overcome barriers to the application of facial assessment arising out of its resource intensiveness are described and evaluated, including recent work on computer- based automatic assessment.

Indicators of pain in neonates at risk for neurological impairment

AIM

This paper is a report of a study to compare the importance and usefulness ratings of physiological and behavioural indicators of pain in neonates at risk for neurological impairment by nurse clinicians and pain researchers.

BACKGROUND

Neonates at risk for neurological impairment have not been systematically included in neonatal pain measure development and how clinicians and researchers view pain indicators in these infants is unknown.

METHODS

Data triangulation was undertaken in three Canadian Neonatal Intensive Care Units using data from: (a) 149 neonates at high, moderate and low risk for neurological impairment, (b) 95 nurse clinicians from the three units where infant data were collected and (c) 14 international pain researchers. Thirteen indicators were assessed following heel lance in neonates and 39 indicators generated from nurse clinicians and pain researchers were assessed for importance and accuracy. Data were collected between 2004 and 2005.

RESULTS

Across risk groups, indicators with the highest accuracy for discriminating 'pain' among neonates were: brow bulge (77-83%), eye squeeze (75-84%), nasolabial furrow (79-81%), and total facial expression (78-83%). Correlations between nurse ratings and neonatal accuracy scores ranged from moderate to none (mild risk r = 0.52, P = 0.07; moderate r = 0.43, P = 0.15; high r = -0.12, P = 0.69). Researchers demonstrated a better understanding of the importance of pain indicators (mild risk, r = 0.91, P < 0.001; moderate 0.85, P < 0.001; 0.0002; high r = 0.64, P = 0.019) than nurse clinicians.

CONCLUSION/DISCUSSION

Facial actions were rated as the most important indicators of neonatal pain. However, as neurological impairment risk increased, physiological indicators were rated more important by nurse clinicians and pain researchers, opposite to pain indicators demonstrated by neonates.

Changes in physiological and behavioural pain indicators over time in preterm and term infants at risk for neurologic impairment

BACKGROUND

Approximately 10% of infants admitted to a Neonatal Intensive Care Unit (NICU) are at risk for Neurological Impairment (NI). While we have limited knowledge on the influence of NI risk on pain responses, we have no knowledge of how these responses change over time.

OBJECTIVE

To compare physiological and behavioural pain responses of infants at three levels of NI risk during the NICU neonatal period (Session 1) and at 6 months of age (Session 2).

DESIGN/METHODS

Prospective observational design with 149 preterm and term infants at high (Cohort A, n=54), moderate (Cohort B, n=45) and mild (Cohort C, n=50) risks for NI from 3 Canadian tertiary level NICUs. Infants were observed in the NICU during 3 standardized phases of a heel lance: baseline, stick and return-to-baseline. At 6 months, infants were observed during the same three phases during an intramuscular immunization injection. Physiological (heart rate, oxygen saturation) and behavioural (9 facial actions, cry) responses were continuously recorded.

RESULTS

A significant interaction of Phase by Session was found with less total facial activity observed during Session 2 (all p values<0.04). A significant interaction for Session by Cohort was found, showing that infants in Cohort A had significantly more change from baseline-to-stick phase for brow bulge, eye squeeze, nasolabial furrow and open lips between sessions with less facial actions demonstrated at Session 2 (all p<0.02). There were significantly lower mean and minimum heart rate (all p<0.02) and higher minimum and maximum oxygen saturation (p<0.04) at Session 2. Significantly higher mean and minimum fundamental cry frequencies (pitch) in Cohort B (p<0.04) were found in Session 1. Cohort A had significantly longer cry durations, but no significant differences in cry dysphonation.

CONCLUSIONS

Behavioural and physiological infant pain responses were generally diminished at 6 months of age compared to those in the neonatal period with some differences between NI risk groups in cry responses. Future exploration into the explanation for these differences between sessions and cohorts is warranted.

Cerebral hemodynamic changes during intensive care of preterm infants

OBJECTIVES

The objectives of this study were to examine the circulatory changes experienced by the immature systemic and cerebral circulations during routine events in the critical care of preterm infants and to identify clinical factors that are associated with greater hemodynamic-oxygenation changes during these events.

METHODS

We studied 82 infants who weighed <1500 g at birth and required intensive care management and continuous blood pressure monitoring from an umbilical arterial catheter. Continuous recording of cerebral and systemic hemodynamic and oxygenation changes was performed. We studied 6 distinct types of caregiving events during 10-minute epochs: (1) quiet baseline periods; (2) minor manipulation; (3) diaper changes; (4) endotracheal tube suctioning; (5) endotracheal tube repositioning; and (6) complex events. Each event was matched with a preceding baseline. We examined the effect of specific clinical factors and cranial ultrasound abnormalities on the systemic and cerebral hemodynamic oxygenation changes that were associated with the various event types.

RESULTS

There were highly significant differences in hemodynamics and oxygenation between events overall and baseline epochs. The magnitude of these circulatory changes was greatest during endotracheal tube repositioning and complex caregiving events. Lower gestational age, higher illness severity, chorioamnionitis, low Apgar scores, and need for pressor-inotropes all were associated with circulatory changes of significantly lower magnitude. Cerebral hemodynamic changes were associated with early parenchymal ultrasound abnormalities.

CONCLUSIONS

Routine caregiving procedures in critically ill preterm infants are associated with major circulatory fluctuations that are clinically underappreciated and underdetected by current bedside monitoring. Our data underscore the importance of continuous cerebral hemodynamic monitoring in critically ill preterm infants.

Kangaroo Care (skin contact) reduces crying response to pain in preterm neonates: pilot results

Crying commonly occurs in response to heel stick and adversely affects the infant's physiologic stability. Minimal crying in response to pain is desired. "Kangaroo Care," skin contact between mother and infant, reduces pain and may reduce crying in response to pain. The purpose of this pilot study was to test Kangaroo Care's effect on the preterm infant's audible and inaudible crying response to heel stick. Inaudible crying has not been previously studied. A prospective randomized cross-over study with 10 preterm infants 2-9 days old (30-32 weeks' postmenstrual age) was conducted. Infants were randomly assigned to two sequences (sequence A: day 1 heel stick in Kangaroo Care [after 30 min of prone skin contact upright between maternal breasts] and day 2 heel stick in incubator [inclined, nested and prone]; or sequence B: opposite of sequence A) was conducted. Videotapes of baseline, heel warming, heel stick, and recovery phases were scored for audible and inaudible crying times. Audible and inaudible crying times for each subject in each phase were summed and analyzed by repeated-measures analysis of variance. Subject characteristics did not differ between those in the two sequences. Crying time differed between the study phases on both days (p <or= .001). When in Kangaroo Care compared with the incubator, crying time was less during the heel stick (p = .001) and recovery (p = .01) phases, regardless of sequence. Because Kangaroo Care reduced crying in response to heel stick in medically stable preterm infants, a definitive study is merited before making recommendations.

Pain behaviours in Extremely Low Gestational Age infants

BACKGROUND

To date, there are over 40 infant pain measures. Despite this plethora of measures, only 8 have included preterm infants and only 2 have included Extremely Low Gestational Age (ELGA; infants <28 weeks GA) in their development. Without reliable, valid and clinically useful indicators for procedural pain in ELGA infants, clinicians have no means to interpret the responses from an immature infant who may respond differently from infants of older GA.

OBJECTIVE

To examine the physiological, behavioural and biochemical responses to painful and non-painful procedures in ELGA infants and the influence of GA and sex.

DESIGN/METHODS

A prospective crossover design with 50 ELGA infants from one Canadian tertiary level NICU was conducted. Infants were assessed in random order during standardized painful (heel lance) and non-painful (diaper change) procedures. Physiological (heart rate, oxygen saturation) and behavioural (facial and body movement) indicators were continuously collected during 4 phases of the procedures. Biochemical (salivary cortisol) indicators were collected immediately before and 20 min following the procedures.

RESULTS

Four facial actions (brow bulge, eye squeeze, nasolabial furrow, vertical mouth stretch) increased immediately following the heel lance. There were no specific changes in physiological, body movement or cortisol indicators following the heel lance. ELGA infants demonstrated greater body movements during the diaper change, which may reflect immature motor coordination. No differences in pain responses were found for infants born between 23-25 6/7 weeks GA and those between 26-28 weeks GA. Similarly, no gender differences were found.

CONCLUSIONS

Changes in 4 facial actions were the most sensitive indicators of pain in ELGA infants. This finding is consistent with existing measures where facial actions are the most prominent pain indicators. Specific body movements such as those included in NIDCAP, may provide more information about pain in ELGA infants. Movements such as hand-on-face, finger splaying, fisting, arching or yawning need to be examined in future research.

Pain in children: recent advances and ongoing challenges

Significant advances in the assessment and management of acute pain in children have been made, and are supported by an increase in the availability and accessibility of evidence-based data. However, methodological and practical issues in the design and performance of clinical paediatric trials limit the quantity, and may influence the quality, of current data, which lags behind that available for adult practice. Collaborations within research networks, which incorporate both preclinical and clinical studies, may increase the feasibility and specificity of future trials. In early life, the developing nervous system responds differently to pain, analgesia, and injury, resulting in effects not seen in later life and which may have long-term consequences. Translational laboratory studies further our understanding of developmental changes in nociceptor pathway structure and function, analgesic pharmacodynamics, and the impact of different forms of injury. Chronic pain in children has a negative impact on quality of life, resulting in social and emotional consequences for both the child and the family. Despite age-related differences in many chronic pain conditions, such as neuropathic pain, management in children is often empirically based on data from studies in adults. There is a major need for further clinical research, training of health-care providers, and increased resources, to improve management and outcomes for children with chronic pain.