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

Prolonged pain in premature neonates hospitalised in neonatal intensive care units: A scoping review

BACKGROUND

Exposure to repetitive pain during the neonatal period has been shown to have important short and long-term effects on the neurodevelopment of the premature neonate and can contribute to experienced prolonged pain. A uniform taxonomy of neonatal prolonged pain is still lacking to this day which contributes to suboptimal prolonged pain management in neonatal intensive care units. Accordingly, a scoping review exploring the state of knowledge about prolonged pain in preterm neonates hospitalised in the neonatal intensive care unit will contribute to the developing field of neonatal prolonged pain and provide recommendations for clinical prolonged pain management.

OBJECTIVE

To determine the scope, extent, and nature of the available literature on prolonged pain in premature neonates hospitalised in neonatal intensive care units.

DESIGN

Scoping review.

METHODS

An electronic search was conducted from inception to November 2023 in the databases of CINAHL, PubMed, Medline, Web of Science, GeryLit.org and Grey Source Index. Included studies discussed concepts related to neonatal prolonged pain such as definitions of prolonged pain, indicators of prolonged pain, contexts that result in prolonged pain, prolonged pain evaluation tools, consequences of prolonged pain and interventions for prolonged pain management.

RESULTS

Key concepts of neonatal prolonged pain were identified in the 86 included articles of this scoping review such as definitions (n = 26), indicators (n = 39), contexts (n = 49), scales (n = 56), consequences of prolonged pain (n = 30) and possible interventions for prolonged pain management (n = 22). Whilst a consensus on a definition has yet to be achieved, no proximate event was shown to cause prolonged pain and a time criterion was identified by authors as being relevant in defining prolonged pain. Interestingly, the context of hospitalisation was identified as being the most indicative of prolonged pain in premature neonates and should guide its evaluation and management, whilst only limited pain management interventions and consequences were discussed.

CONCLUSION

The findings of this scoping review contribute to the foundation of growing knowledge in neonatal prolonged pain and shed light on the ambiguity that currently exists on this topic in the scientific literature. This review summarises knowledge of key concepts necessary for a better understanding of prolonged pain and stresses the importance of considering contexts of hospitalisation for prolonged pain evaluation and management in neonatal intensive care units, with the objective of improving developmental outcomes of premature neonates.

TWEETABLE ABSTRACT

A scoping review reveals that the contexts of prolonged pain in premature neonates hospitalised in the neonatal intensive care unit are essential in guiding its evaluation and management.

Validity and Reliability of Pain and Behavioral Scales for Preterm Infants: A Systematic Review

OBJECTIVE

To systematically review the instruments used to assess behavior, stress, and/or pain in preterm newborns in the neonatal intensive care unit (NICU) and verify the validity and reliability of these instruments.

DATA SOURCES

Electronic searches were conducted in PubMed/MEDLINE, Cochrane Library, Web of Science, Scientific Electronic Library Online (SciELO), Latin American and Caribbean Literature on Health Sciences (LILACS), and EBSCOhost Research Platform. 12,295 records were found.

REVIEW/ANALYSIS METHODS

37 studies met the inclusion and exclusion criteria.  The COnsensus-based Standards for selecting health Measurement INstruments (COSMIN) checklist was used to assess the quality assessment and measurement properties.

RESULTS

We identified 25 scales that assessed behavior, pain, and/or stress in preterm newborns. The Behavioral Indicators of Infant Pain (BIPP), Crying, Requires Oxygen, Increased Vital Signs, Expression, Sleeplessness (CRIES), Premature Infant Pain Profile (PIPP), and Premature Infant Pain Profile-Revised (PIPP-R) had scored "very good" in quality data. The PIPP and PIPP-R scales received the "very good" classification in validity assessment. The Evaluation Enfant Douleur (EVENDOL), Children's and Infants Postoperative Pain Scale (CHIPPS), PIPP-R, Neonatal Pain Agitation and Sedation Scale (N-PASS), Bernese Pain Scale for Neonates (BPSN), Faceless Acute Neonatal Pain Scale (FANS), BIIP, and Pain Assessment Scale for Preterm Infants (PASPI) obtained an assessment classified as excellent on reliability, both for inter-rater reliability and internal consistency, and the BPSN demonstrated a very strong value to intra-rater reliability.

CONCLUSIONS

Considering the assessments of inter-rater reliability, internal consistency, and quality of scales by COSMIN, the BIPP, and PIPP-R, were the scales considered appropriate.

Quantification of stress exposure in very preterm infants: Development of the NeO-stress score

BACKGROUND

Stress during treatment at the Neonatal Intensive Care Unit (NICU) has long-term negative consequences on preterm infants' development.

AIMS

We developed an instrument suited to validly determine the cumulative stress exposure for preterm infants in a NICU.

STUDY DESIGN

This survey study made use of two consecutive questionnaires.

SUBJECTS

NICU nurses and physicians from the nine NICUs in the Netherlands.

OUTCOME MEASURES

First, respondents rated the relevance of 77 items encompassing potentially stressful procedures, commented on their comprehensibility and the comprehensiveness of the list. We calculated the content validity per item (CVI-I) and included only the relevant items in a second questionnaire in which the participants rated the stressfulness from 0 (not stressful) to 10 (extremely stressful). A stressfulness index - representing the median score - was calculated for each included item.

RESULTS

Based on the CVI-I of the 77 items, step 1 resulted in 38 items considered relevant to quantify stress in preterm infants during the first 28 days of life. This list of 38 items exists of 34 items with a CVI-I if 0.78 or higher, one of these items was split into two items, and three items were added to improve comprehensiveness. The stressfulness index ranged from five to nine.

CONCLUSIONS

The NeO-stress score consists of stressful items including their severity index and was developed to determine cumulative stress exposure of preterm infants. Evaluating the cross-cultural validity, correlating it to behavioural and biological stress responses, and evaluating its ability to predict preterm infants at risk for the negative effects following stress might expand the possibilities for this instrument.

Investigating the psychometric properties of the Persian version of Neonatal Pain, agitation, and sedation scale

BACKGROUND

The Neonatal Pain, Agitation, and Sedation Scale (N-PASS) is a tool that, in addition to assessing pain, also considers the level of sedation in infants. This study aimed to translate and determine the psychometric properties of pain and sedation parts of the N-PASS in neonates.

METHODS

Two evaluators observed 70 non-intubated and 30 intubated infants admitted to the neonatal ward and neonatal intensive care unit. Totally, 1000 observations were done to assess discriminant and criterion validity, internal consistency, and inter-rater reliability.

RESULTS

The discriminant validity of both the sedation and pain parts of the Persian version of N-PASS (PN-PASS) was confirmed by significantly increasing the pain score during the painful procedures compared to the rest time. The criterion validity of the PN-PASS was approved by the high correlation (r = 0.85) between the Premature Infant Pain Profile and the PN-PASS. The intraclass correlation coefficient between the two evaluators was in the range of r = 0.71-0.92, and Cronbach's alpha coefficient during non-painful and painful procedures was in the range of α = 0.57 and α = 0.86.

CONCLUSION

This study showed that the Persian version of N-PASS is valid and reliable in assessing pain and sedation in term and preterm infants. There were an increase in some items' scores is more related to the mechanism of the procedures than to the painful nature of the stimuli.

Measures of Stress Exposure for Hospitalized Preterm Infants

BACKGROUND

Extended hospitalization in neonatal intensive care units subjects preterm infants to multiple stress exposures that affect long-term cognitive functioning, motor development, and stress reactivity. Measurement of stress exposure is challenging with multiple measures of stress exposure in use, including counts of skin-breaking or invasive procedures or counts of noxious sensory exposures.

OBJECTIVES

The purpose of this analysis was to compare measures of stress exposure commonly used by researchers and to determine the predictive validity of these measures for early neurobehavior. We accomplished this objective through the following specific aims: (a) describe the stress exposures of preterm infants in the first 2 weeks of life, (b) determine the correlations among measures of stress exposure, and (c) compare the predictive validity of measures of stress exposure for early neurobehavior.

METHODS

Very preterm infants born between 28 and 31 weeks postmenstrual age were enrolled from four neonatal intensive care units in a large Midwest city. We measured stress exposure over the first 14 days of life for each infant as a count of skin-breaking procedures, a count of invasive procedures, and cumulative scores derived from the Neonatal Infant Stressor Scale. Neurobehavior was assessed at 35 weeks postmenstrual age using the motor development and vigor and alertness/orientation subscales from the Neurobehavioral Assessment of the Preterm Infant. We used Spearman's rho to determine correlations among the measures of stress exposure and multiple linear regression to determine the predictive validity of each stress exposure measure for neurobehavioral outcomes.

RESULTS

Seventy-one preterm infants were included in the analysis. We found marked variance across individuals in all measures of stress exposure. There were moderate-high correlations among the measures of stress exposure. No measure of stress exposure was associated with early neurobehavior.

DISCUSSION

The stress experiences of hospitalized preterm infants vary. This variance is reflected in all measures of stress exposure. Because measures of stress exposure are highly correlated, the most objective measure requiring the least interpretation should be used. However, the currently available measures of stress exposure used in this analysis may not reflect the infant's physiological stress responses and fail to associate with early neurobehavior.

Novel method of measuring chronic stress for preterm infants: Skin cortisol

BACKGROUND AND OBJECTIVES

Infants who begin life in the medicalized environment of the neonatal intensive care unit (NICU) do so under stressful conditions. Environmental exposures are often abrasive to vulnerable infants, while invasive and noninvasive lifesaving interventions provide additional pain and/or stress. The most commonly selected biomarker to measure stress is cortisol. The skin is the barrier between the external environment and communicates with our neurological, endocrine and immune regulatory networks. To examine if skin cortisol may be a reliable biomarker of stress, NICU stress exposure and repeated measurements of skin cortisol in very preterm infants were examined retrospectively during the first 6 weeks of life. The temporal relationship between skin cortisol and NICU stress exposure was also analyzed.

MATERIALS AND METHODS

Participants included 82 preterm infants born weighing less than 1500 g, admitted to a level III NICU, with a mean gestational age of 28.5 weeks. Infants were studied from birth through 6 weeks of life. NICU stress data was collected using the Neonatal Infant Stressor Scale. Skin samples were collected using d-squame tape as soon after birth as possible and every two weeks thereafter.

RESULTS

On average, infants experienced approximately 43 stressful events per day during the first 6 weeks of life in the NICU. Stress level and cortisol reactivity varied by gestation age. Higher stress resulted in higher cortisol for infant >28 weeks; lower stress scores were associated with higher stress for infants <28 weeks. Stress exposure during 7 days prior to cortisol sampling yielded the highest AUC for the 2 groups. A statistically significant interaction was identified between gestational age and stress exposure during the previous 7 days (p < 0.01).

CONCLUSION

This is the first study to demonstrate skin cortisol as a preterm infant biomarker of chronic stress exposure. For infants with appropriate skin maturation, this non-invasive sampling method provides several benefits. Importantly, this method may be less intrusive and disruptive for preterm infants.

Neonatal Pain: Perceptions and Current Practice

Neonates may experience more than 300 painful procedures throughout their hospitalizations. Prior to 1980, there was a longstanding misconception that neonates do not experience pain. Current studies demonstrate that not only do neonates experience pain but also, due to their immature nervous systems, they are hypersensitive to painful stimuli. Poorly treated pain may lead to negative long-term consequences. Proper assessment of neonate pain is vital. The use of nonpharmacologic treatments may be beneficial in alleviating neonate pain. Pharmacologic treatments in the neonate have been well established. Pharmacologic and nonpharmacologic interventions can be used in conjunction to increase the efficacy of analgesia.

The impact of cumulative pain/stress on neurobehavioral development of preterm infants in the NICU

BACKGROUND

Vulnerable preterm infants experience repeated and prolonged pain/stress stimulation during a critical period in their development while in the neonatal intensive care unit (NICU). The contribution of cumulative pain/stressors to altered neurodevelopment remains unclear. The study purpose was to investigate the impact of early life painful/stressful experiences on neurobehavioral outcomes of preterm infants in the NICU.

METHODS

A prospective exploratory study was conducted with fifty preterm infants (28 0/7-32 6/7weeks gestational age) recruited at birth and followed for four weeks. Cumulative pain/stressors (NICU Infant Stressor Scale) were measured daily and neurodevelopmental outcomes (NICU Network Neurobehavioral Scale) were examined at 36-37weeks post-menstrual age. Data analyses were conducted on the distribution of pain/stressors experienced over time and the linkages among pain/stressors and neurobehavioral outcomes.

RESULTS

Preterm infants experienced a high degree of pain/stressors in the NICU, both in numbers of daily acute events (22.97±2.30 procedures) and cumulative times of chronic/stressful exposure (42.59±15.02h). Both acute and chronic pain/stress experienced during early life significantly contributed to the neurobehavioral outcomes, particularly in stress/abstinence (p<0.05) and habituation responses (p<0.01), meanwhile, direct breastfeeding and skin-to-skin holding were also significantly associated with habituation (p<0.01-0.05).

CONCLUSION

Understanding mechanisms by which early life experience alters neurodevelopment will assist clinicians in developing targeted neuroprotective strategies and individualized interventions to improve infant developmental outcomes.