Premature Infant Pain Profile-Revised Research Articles

Behavioral and physiological pain structures of PIPP-R and parental stress: structural equation modeling approach.

Although most non-acute pain assessment tools are multi-dimensional (behavioral and physiological measures) in their approach, the outputs of such tools are considered unidimensional. This study aimed to explore and determine the behavioral and physiological pain structures of Premature Infant Pain Profile-Revised (PIPP-R) for neonates and its association with parental stress. This cross-sectional study was conducted in 2022-2023 in Isfahan, Iran. We recruited 400 pre-term infants, i.e. with gestational age (GA) of less than 37weeks who were admitted to the NICU of educational hospitals. PIPP-R and Parental Stressor Scale: Neonatal Intensive Care Unit (PSS: NICU) were used for data gathering. The latent structures of pain and its association with parental stress were explored using latent variable modeling approach. A two-factor model, i.e. behavioral and physiological pain factors, was extracted, explaining 65% of the total variance. The results of confirmatory factor analysis showed that the identified structures in the exploratory factor analysis could be nearly replicated (CFI = 0.99، TLI = 0.98, RMSEA = 0.001). Behavioral pain structure, independent from gestational age had a significant direct association with parental stress score (β = 0.005, SE = 0.002, p = 0.026). The PIPP-R assesses both behavioral and physiological pain factors. We also found that behavioral pain factor was associated with parental stress. These results may provide a potential clue for physicians, nurses, and parents to manage the pain in preterm infant. The PIPP-R scores in preterm infants consist of "Behavioral and Physiological" pain factors. Single dependence on behavioral indicators (such as facial expression) has some limitations. Multidimensional tools may be the optimal method in detecting pain in preterm infants. Parental stress can affect behavioral pain structure in preterm infants. Intensive care nurses play an effective role in reducing the parental stress and pain severity of these preterm infants by including the help of mothers in procedures and providing them with psychological support.

Efficacy of 10% Dextrose versus Expressed Breast Milk in Relieving Procedural Pain in Neonates – A Randomized Controlled Trial

Aim: This study aims to compare the efficacy of 10% dextrose (10%D) and expressed breast milk (EBM) in relieving heel prick pain in neonates assessed by premature infant pain profile-revised (PIPP-R). Settings and Design: This study was done in the neonatal intensive care unit under the department of pediatrics, hospital-based prospective, randomized controlled trial. Subjects and Methods: The study includes neonates born between ≥34 weeks and ≤42 weeks of gestational age. The 72 enrolled neonates were randomized into two intervention groups (EBM and 10%D). One milliliter of test solution was given to the baby 30 s before the heel prick. Pain reactions were scored using the PIPP-R scoring system, and two independent observers were chosen, who were blinded to what intervention was given. Results: For the EBM solution, the mean PIPP-R at 0 s was 7.19 ± 2, 5.5 ± 1.5 at 30 s, and 4.28 ± 1.65 at 60 s. For the 10%D solution, the mean PIPP-R at 0 s was 4.97 ± 1.42, 2.36 ± 1.44 at 30 s, and 1.69 ± 1.53 at 60 s. The difference in the mean PIPP-R between the two groups was statistically significant, and the 10%D group majority had only minimal pain throughout the procedure. Conclusions: Compared to the EBM group, 10%D significantly lowered the mean PIPP-R score, giving good pain relief and less procedural discomfort.

A comparison of the effect of procedural pain on cerebral oxygen saturation between late preterm and term infants

ObjectivesWe prospectively compared cerebral oxygen saturation (CrSO2) and pain score changes during procedures in late preterm (LPT) versus term infants.MethodsNear-infrared spectroscopy, pulse oximetry, Neonatal Infant Pain Scale (NIPS) and Premature Infant Pain Profile-Revised (PIPP-R) scores were assessed and CrSO2 data analyzed.ResultsThirty infants in each group were evaluated. LPT infants displayed a milder significant drop in Minimum post-procedural CrSO2 and smaller Maximum-Minimum post-procedural CrSO2 disparity. CrSO2 minute changes between the groups were non-significant. Moderate correlations were observed in both groups between NIPS and Minimum post-procedural CrSO2, and a moderate correlation was found in the Maximum-Minimum post-procedural CrSO2 difference in LPT infants. No correlation between PIPP-R and CrSO2 values was noted.ConclusionLPT and term infants demonstrated decreased CrSO2 in response to painful procedures. Correlations between CrSO2 and PIPP-R or NIPS scores were poor to moderate, reflecting the complex nature of these associations relative to gestational age.

Effect of parental touch on relieving acute procedural pain in neonates and parental anxiety (Petal): a multicentre, randomised controlled trial in the UK

Touch interventions such as massage and skin-to-skin contact relieve neonatal pain. The Parental touch trial (Petal) aimed to assess whether parental stroking of their baby before a clinically required heel lance, at a speed of approximately 3 cm/s to optimally activate C-tactile nerve fibres, provides effective pain relief. Petal is a multicentre, randomised, parallel-group interventional superiority trial conducted in the John Radcliffe Hospital (Oxford University Hospitals NHS Foundation Trust, Oxford, UK) and the Royal Devon and Exeter Hospital (Royal Devon University Healthcare NHS Foundation Trust, Exeter, UK). Neonates without neurological abnormalities who were born at 35 weeks gestational age or more and required a blood test via a heel lance in the first week of life were randomly assigned (1:1) to receive parental touch for 10 s either before (intervention group) or after (control group) the clinically required heel lance. Randomisation was managed at the Oxford site using a web-based minimisation algorithm with allocation concealment. The primary outcome measure was the magnitude of noxious-evoked brain activity in response to the heel lance measured with electroencephalography (EEG). Secondary outcome measures were Premature Infant Pain Profile-Revised (PIPP-R) score, development of tachycardia, and parental anxiety score. For all outcomes, the per-protocol effect was estimated via complier average causal effect analysis on the full analysis set. The trial is registered on ISRCTN (ISRCTN14135962) and ClinicalTrials.gov (NCT04901611). Between Sept 1, 2021, and Feb 7, 2023, 159 parents were approached to participate in the study, and 112 neonates were included. 56 neonates were randomly assigned to the intervention group of parental stroking before the heel lance and 56 to the control group of parental stroking after the heel lance. The mean of the magnitude of the heel lance-evoked brain activity was 0·85 arbitrary units (a.u.; SD 0·70; n=39; a scaled magnitude of 1 a.u. represents the expected mean response to a heel lance in term-aged neonates) in the intervention group and 0·91 a.u. (SD 0·76; n=43) in the control group. Therefore, the primary outcome did not differ significantly between groups, with a mean difference of -0·11 a.u. (lower in intervention group; SD 0·77; 95% CI -0·42 to 0·20; p=0·38; n=82). No significant difference was observed across secondary outcomes. The PIPP-R difference in means was 1·10 (higher in intervention group, 95% CI -0·42 to 2·61; p=0·15; n=100); the odds ratio of becoming tachycardic was 2·08 (95% CI 0·46 to 9·46; p=0·34, n=105) in the intervention group with reference to the control group; and the difference in parental State-Trait Anxiety Inventory-State score was -0·44 (higher in control group; SD 6·85; 95% CI -2·91 to 2·02; p=0·72; n=106). One serious adverse event (desaturation) occurred in a neonate randomly assigned to the control group, which was not considered to be related to the study. Parental stroking delivered at an optimal speed to activate C-tactile fibres for a duration of 10 s before the painful procedure did not significantly change neonates' magnitude of pain-related brain activity, PIPP-R score, or development of tachycardia. The trial highlighted the challenge of translating an experimental researcher-led tactile intervention into a parent-led approach, and the value of involving parents in their baby's pain management. Wellcome Trust and Bliss.

Ab. No. 8 Neonatal Procedural Pain and Neuromotor Changes on Multisensory Stimulation and Soft Tissue Therapy Among Hospitalized Preterm Neonates: One-Group Pretest-Post-Test Trial

Introduction: Neonatal physiotherapy procedures including MSS and STT might be beneficial for reducing pain and improving neuromotor outcomes among hospitalized neonates. To determine the effects of MSS and STT on reducing procedural pain and improving neuromotor outcomes among hospitalized preterm neonates. Methods: MSS and STT were provided for 5 days of NICU stay. The Premature Infant Pain Profile-Revised (PIPP-R) and Neonatal Pain and Sedation Scale (N-PASS) were used for assessing procedural pain. For assessing neuromotor outcomes among preterm neonates, Infant Neurological International Battery (INFANIB) and Premie neuro scale were used. Wilcoxon signed-rank test was used for estimating the statistically significant difference. Effect Size (ES) within the group was calculated by using the formulae “Wilcoxon Signed-ranks test” for ES. Result: Both statistically significant differences (p<0.05), and clinically important differences were noted in procedural pain (PIPP-R; 3.0, N-PASS; 3.0) and neuromotor outcomes (INFANIB; 3.0, Premie Neuro; 8.0) among hospitalized preterm neonates. Conclusion: MSS and STT given for 5 days of NICU stay reduces procedural pain, and improves neuromotor development among hospitalized preterm neonates. MSS and STT might be given as early intervention care regularly for reducing pain and promoting neuromotor development among hospitalized preterm neonates. However, further randomized controlled trial is needed to substantiate these findings.

The effect of oscillometric blood pressure measurement on pain response in preterm infants.

Preterm neonates are exposed to many painful procedures in neonatal intensive care units. This study aims to evaluate the effect of oscillometric blood pressure (BP) measurement on pain response in preterm infants. This prospective study was performed over 4 months in a level III neonatal intensive care unit. Premature neonates whose gestational age was <34 weeks and postmenstrual age <36 weeks were included if they had no systemic diseases. BP measurement was performed on the right arm. The Premature Infant Pain Profile-Revised (PIPP-R) scores were evaluated three times before, during, and 10 min after BP measurement. During the 5-month period, 100 preterm neonates (53 male infants) were included in the study. Median birth weight and gestational age of the infants were 1148 (IQR: 1015-1300) g and 28 (IQR: 27-30) weeks, respectively. PIPP-R scores were found to be ≥7 in 34% of neonates. PIPP-R scores increased during BP measurement and decreased after. Our results demonstrated that oscillometric BP measurement which is generally accepted as a non-invasive tool for monitoring can produce mild pain in premature neonates of postmenstrual age <36 weeks.

Content Validity of the Spanish Adaptation of the Premature Infant Pain Profile Revised

BackgroundTo the best of our knowledge, there are no validated neonatal pain assessment scales in Spanish. Given the need for such a scale, a study was undertaken to adapt and validate the Premature Infant Pain Profile-Revised (PIPP-R) scale. After translation and back-translation, content validity was addressed, a crucial phase in validation studies, in which researchers examine whether the items that make up the scale represent the content that the scale is intended to assess. AimsThe aim was to provide evidence for the content validity of the Spanish adaptation of the PIPP-R scale. MethodThe study used the Delphi technique with 10 experts. Data collection was anonymous and was conducted through an online platform. It was an ad hoc survey consisting of four questions, with a five-point Likert scale for each item on the scale and for the instruction table. An item-content validity index (I-CVI) and a scale-content validity index (S-CVI) were calculated for the analysis. ResultsAfter two rounds of the survey, all items exceeded an I-CVI of 0.9. The S-CVI value was 0.98 (±0.03) for the scale, and 1 for its instruction table. The kappa index yielded values indicating an excellent degree of agreement. ConclusionsThe Spanish version of the PIPP-R obtained a high degree of content validity according to the expert group and the Delphi technique.

Efficacy of Oral Dextrose versus Acetaminophen versus Placebo on Pain Relief during Retinopathy of Prematurity Eye Examinations: A Randomized, Double-Blind Controlled Clinical Trial.

To assess the effect of oral dextrose versus acetaminophen versus placebo in pain relief in retinopathy of prematurity (ROP) examination. In this prospective randomized, double-blind controlled clinical trial study performed in the ophthalmology clinic of Shafa Hospital (referral hospital for eye disease), Kerman, Iran, 105 premature neonates with birth weight ≤2000 g and gestational age between 28 and 34 weeks were studied. Pain score measurement with Premature Infant Pain Profile-Revised (PIPP-R) during ROP examination in three intervention groups, acetaminophen group (15 mg/kg oral acetaminophen), dextrose group (one cc of oral dextrose 50%), and placebo group (one cc of distilled water), was done. Out of 105 infants, 33 infants received acetaminophen drops, 35 infants received dextrose drops, and 37 infants received placebo. The mean pain score of the group receiving acetaminophen was 11.39, dextrose 12.17, and placebo 11.54. The acetaminophen group had a lower average PIPP-R score. This difference was not significant between the three groups (P = 0.38). Acetaminophen and dextrose in comparison with distilled water did not show a significant difference in reducing neonatal pain during ROP examinations. However, the PIPP-R score in the acetaminophen group was lower compared to the other groups.

Non-opioid analgesics for procedural pain in neonates.

Non-opioid analgesics for procedural pain in neonates.

ALPS-Neo pain and stress assessment scale for neonates-A measure for procedural pain.

The aim of this study was to investigate psychometric properties, reliability and validity, of Astrid Lindgren and Lund Children's Hospitals Pain and Stress Assessment Scale for Preterm and Sick Newborn Infants (ALPS-Neo), as a measure for procedural pain. This observational, prospective study with a repeated measures design, explored inter-rater reliability by two raters assessing 21 neonates during non-pain and pain events. Construct validity was explored, that is, ability to discriminate between non-pain and pain, and criterion validity by correlating ALPS-Neo with Premature Infant Pain Profile-Revised (PIPP-R) and Skin Conductance Algesimeter (SCA) in 54 neonates without ventilator support and sedation undergoing routine heel-stick procedure in a tertiary neonatal intensive care unit. Mean gestational and assessment age of 54 infants was 33.8 weeks and 12.7 days respectively. Inter-rater reliability from baseline, skin wiping, heel-stick events for 21 infants demonstrated intraclass correlations with 95% confidence intervals (CI) of 0.49 (-0.27 to 0.79), 0.86 (0.65-0.94) and 0.73 (0.34-0.89) respectively. ALPS-Neo discriminated significantly between baseline, non-pain and heel-stick (mean differences from pain event -2.3 and -1.0 respectively) and correlated during heel-stick with PIPP-R (r = 0.56, 95% CI: 0.34-0.72), not with SCA. ALPS-Neo may be used as a measure for procedural pain.

The effectiveness of repeated sucrose for procedural pain in neonates in a longitudinal observational study.

To determine the analgesic effectiveness of repeated sucrose administration for skin-breaking (SB) procedures over the Neonatal Intensive Care Unit (NICU) hospitalization of preterm infants. Longitudinal observational study, conducted in four level III Canadian NICUs. Eligible infants were <32 weeks gestational age at birth, and <10 days of life at enrollment. Infants received 24% sucrose (0.12 ml) prior to all painful procedures. The Premature Infant Pain Profile - Revised (PIPP-R) was used at 30 and 60 seconds after a medically-required SB procedure as soon as possible after enrollment and weekly up to three additional times for scheduled procedures. 172 infants (57.3% male, gestational age 28.35 (±2.31) weeks) were included. The mean 30 s PIPP-R scores were 6.11 (±3.68), 5.76 (±3.41), 6.48 (±3.67), and 6.81 (±3.69) respectively; there were no statistically significant interactions of study site by time (p = 0.31) or over time (p = 0.15). At 60 s, mean PIPP-R scores were 6.05 (±4.09), 5.74 (±3.67), 6.19 (±3.7), and 5.99 (±3.76) respectively; there were no study site by time interactions (p = 0.14) or differences over time (p = 0.52). There was a statistically significant site difference in the effectiveness of sucrose at 30 and 60 seconds (p < 0.01). Consistently low PIPP-R scores following a skin-breaking procedure indicated that the analgesic effectiveness of the minimal dose of sucrose was sustained over time in the NICU. Further research is required to determine the optimal combination of sucrose and other pain management strategies to improve clinical practice and the impact of consistent use of repeated use of sucrose on neurodevelopment.

Gentle Touch and Sucrose for Pain Relief during Suctioning in Preterm Newborns-A Randomized Clinical Trial.

Pain management is challenging in neonatal care. We aimed to compare the effects of gentle touch and sucrose on pain relief during suctioning in premature newborns (PTNB). This crossover randomized clinical trial enrolled PTNBs with low birth weight, hemodynamically stable, and requiring suctioning during hospitalization in the neonatal intensive care unit. PTNBs underwent three different suctioning procedures. The first was performed without intervention (baseline). Right after, PTNBs were randomly allocated (sucrose and gentle touch or vice versa) to the next two suctioning procedures. Two validated scales assessed pain: the Neonatal Infant Pain Scale (NIPS) and the Premature Infant Pain Profile-Revised (PIPP-R). We evaluated 50 PTNBs (mean of 28 weeks) with a mean low birth weight of 1050 g; most were under continuous positive airway pressure 37 (74%) and mechanical ventilation 41 (82%). Gentle touch was efficacious for pain relief since NIPS (p = 0.010) compared to baseline. Sucrose was also effective in reducing pain NIPS and PIPP-R (p < 0.001). Although the two interventions reduced pain, no difference was observed between gentle touch and sucrose.

Effects of white noise on procedural pain-related cortical response and pain score in neonates: A randomized controlled trial

ObjectivesTo evaluate the effects of white noise on pain-related cortical response, pain score, and behavioral and physiological parameters in neonates with procedural pain. MethodsA double-blind, randomized controlled trial was conducted. Sixty-six neonates from the Neonatal Intensive Care Unit in a university-affiliated general hospital were randomly assigned to listen to white noise at 50 dB (experimental group) or 0 dB (control group) 2 min before radial artery blood sampling and continued until 5 min after needle withdrawal. Pain-related cortical response was measured by regional cerebral oxygen saturation (rScO2) monitored with near-infrared spectroscopy, and facial expressions and physiological parameters were recorded by two video cameras. Two assessors scored the Premature Infant Pain Profile-Revised (PIPP-R) independently when viewing the videos. Primary outcomes were pain score and rScO2 during arterial puncture and 5 min after needle withdrawal. Secondary outcomes were pulse oximetric oxygen saturation (SpO2) and heart rate (HR) during arterial puncture, and duration of painful expressions. The study was registered at the Chinese Clinical Trial Registry (ChiCTR2200055571). ResultsSixty neonates (experimental group, n = 29; control group, n = 31) were included in the final analysis. The maximum PIPP-R score in the experimental and control groups was 12.00 (9.50, 13.00), 12.50 (10.50, 13.75), respectively (median difference −0.5, 95% CI −2.0 to 0.5), and minimum rScO2 was (61.22 ± 3.07)%, (61.32 ± 2.79)%, respectively (mean difference −0.325, 95% CI −1.382 to 0.732), without significant differences. During arterial puncture, the mean rScO2, HR, and SpO2 did not differ between groups. After needle withdrawal, the trends for rScO2, PIPP-R score, and facial expression returning to baseline were different between the two groups without statistical significance. ConclusionThe white noise intervention did not show beneficial effects on pain-related cortical response as well as pain score, behavioral and physiological parameters in neonates with procedural pain.

NCPD Test for Evaluation of the Premature Infant Pain Profile-Revised (PIPP-R) e-Learning Module: Immediate and Sustained Competency.

NCPD Test for Evaluation of the Premature Infant Pain Profile-Revised (PIPP-R) e-Learning Module: Immediate and Sustained Competency.

Efficacy and Safety of Multimodal Analgesic Therapy to Prevent Pain during Screening for Retinopathy of Prematurity

Background: Premature infants admitted to the Neonatal Intensive Care Unit are exposed on average to 14 painful procedures per day, as the retinopathy of prematurity screening. Neonatal pain is often underestimated and insufficiently treated, but there are short-term and long-term deleterious effects in premature infants exposed to repetitive pain. Since premature infants cannot verbalize the pain, the use of validated measurement tools is recommended for its evaluation and measurement of pain. The aim of this study was to determine the usefulness of a multimodal analgesic therapy proposed, to prevent pain in premature infants under retinal evaluation. Methods: We carried out a blinded, randomized clinical trial. Premature infants ≤ 34 weeks of gestational age received standard therapy (one drop of tetracaine in each eye) or proposed multimodal analgesic therapy (paracetamol oral at 15 mg/ kg, 30 minutes prior to retinal evaluation, and intranasal fentanyl 2 μg/kg, 5 minutes prior to retinal screening, as well as warm containment and non-nutritional suction. The primary outcome was the score of Premature Infant Pain Profile-Revised (PIPP-R). The application of the score PIPP-R was performed 35 minutes before the procedure, during, and 15 minutes after the procedure. Results: There were no significant differences in PIPP-R score prior to the retinal screening, however, during the retinal evaluation the PIPP-R score was significantly lower in the proposed multimodal therapy group (14.0 vs 6.5, p=0.0001); and 15 minutes after the procedure, score remained lower in the proposed multimodal therapy group (2.9 vs 1.6 p=0.0001). No adverse effects were documented in neither group. In conclusion, retinal screening cause’s deep pain, the topical tetracaine is insufficient to mitigate it. The proposed multimodal therapy can be useful to prevent the pain caused by the procedure and it does not cause adverse effects.

Breast milk vs 24% sucrose for procedural pain relief in preterm neonates: a non-inferiority randomized controlled trial.

To compare the pain scores between the two groups, breast milk (BM) and 24% sucrose, in preterm neonates undergoing automated heel lance for the blood draw. The study is designed as a randomized, single-blinded, non-inferiority trial. Infants born between 30 1/7weeks and 36 6/7 weeks of gestation were randomly assigned to receive either 24% sucrose or expressed BM. The Premature Infant Pain Profile-Revised (PIPP-R) was utilized to provide pain scores. No differences were noted in the baseline characteristics between the two groups. The quantile regression estimates for PIPP-R scores during the procedure were statistically non-significant at all percentile levels of distribution (50%ile coefficient 0, 95% CI -0.49 to 0.49). We conclude that BM is not inferior to 24% sucrose in providing analgesia during heel lance in moderate and late preterm infants. This trial was registered at www. gov (identifier NCT04898881).

Evaluation of pain and physiological stress during targeted neonatal echocardiography.

Targeted neonatal echocardiography (Tn-Echo) is a non-invasive examination which may cause pain/discomfort and physiological instability in neonates, but there is little evidence for the same. We conducted this study to evaluate whether targeted neonatal echocardiography causes pain or physiological stress to newborn infants. This cross-sectional study was conducted in a tertiary level NICU. Neonates undergoing targeted neonatal echocardiography were enrolled in this study. Pain was assessed using Premature Infant Pain Profile-Revised (PIPP-R) score before, during and after targeted neonatal echocardiography examination. Heart rate, oxygen saturation, perfusion index and blood pressure were also recorded at the same time points. A total of 88 neonates were enrolled. Mean (SD) PIPP-R score during Tn-Echo was 8.18 (2.6) versus 3.60 (1.8) and 4.24 (2.0) before and after respectively (p value < 0.001). Heart rate and respiratory rate were significantly higher during targeted neonatal echocardiography; oxygen saturation and perfusion index were significantly lower during targeted neonatal echocardiography. Preterm infants had higher PIPP-R score compared to term neonates before, during and after the Tn-Echo [8.76 (2.4) versus 6.81 (2.4); p value < 0.001]. Targeted neonatal echocardiography causes significant pain/discomfort and physiological instability in neonates.

Evaluation of the Premature Infant Pain Profile-Revised (PIPP-R) e-Learning Module: Immediate and Sustained Competency.

Electronic health (e-health) learning is a potential avenue to educate health professionals about accurately using infant pain assessment tools, although little is known about the impact of e-health interventions on clinical competence. To evaluate whether an e-health learning module for teaching the accurate use of the Premature Infant Pain Profile-Revised (PIPP-R) pain assessment tool results in immediate and sustained competency to assess infant pain. Neonatal intensive care unit (NICU) nurses who participated in a larger study across 2 tertiary NICUs in Canada examining the implementation and clinical utility of the PIPP-R e-learning module completed 2 follow-up evaluations at 1 week and 3 months. Participants were asked to view a video recording of an infant undergoing a painful procedure and to assess the infant's pain intensity response using the PIPP-R measure. Immediate and sustained competency was assessed via interrater consensus of participant-reported PIPP-R scores compared with those of an experienced trained coder. Of the 25 eligible nurses, 22 completed 1-week and 3-month follow-up evaluations. At the 1-week follow-up, 84% of nurses scored the video accurately compared with 50% at 3 months. Behavioral pain indicators were more likely to be scored incorrectly than physiological indicators. Follow-up training after completion of the initial e-learning module training may improve competency related to the clinical use of the PIPP-R tool to assess infant pain over time. Additional study regarding the need and timing of e-health training to optimize sustained competency in infant pain assessment is warranted.

The validity of skin conductance for assessing acute pain in mechanically ventilated infants: A cross-sectional observational study.

Assessing pain in mechanically ventilated infants is challenging. The assessment of skin conductance (SC) is based on the sympathetic nervous system response to stress. This study purpose was to evaluate the validity of SC for assessing pain in mechanically ventilated infants. A prospective cross-sectional observational design was used to study SC and its relation to: the category of procedure (i.e., painful or non-painful); the phase of procedure (i.e., before, during and after), and referent pain measurements (i.e., Premature Infant Pain Profile-Revised (PIPP-R) and Neonatal Facial Coding System (NFCS)). Eligible infants were those up to 12months of age, in intensive care units, who were mechanically ventilated, and required painful and non-painful procedures. From October 2017 to November 2018, 130 eligible infants were identified, and 55 infants were studied. SC (number of waves per second) during painful procedures (median 0.27, interquartile range 0.2-0.4) was statistically significantly higher than those during non-painful procedures (0, 0-0.09). SC during painful procedures was statistically significantly higher than those before (0, 0-0.07) and after painful procedures (0, 0-0.07). SC showed moderate statistically significant positive correlations with PIPP-R (Spearman's rho=0.4-0.62) and the four-item NFCS (Spearman's rho=0.31-0.67) before, during and after painful or non-painful procedures respectively. SC had excellent performance (area under the receiver operator curve=0.979) with excellent sensitivity (92.31%), specificity (95.42%) and negative predictive value (99.21%) but only sufficient positive predictive value (66.67%) when used to discriminate moderate-to-severe pain. SC showed good validity for assessing pain in critically ill infants requiring mechanical ventilation. Pain assessment in mechanically ventilated infants is challenging. In this study, the validity of skin conductance (SC) for pain assessment is evaluated in the same population of infants during painful and nonpainful procedures. SC showed good validity for assessing acute pain in relation to category of procedure, phase of procedure, and referent pain measurements. SC is a promising method, especially with other pain assessment methods and other determinants of pain, in a multimodal pain assessment approach to understand the complexity of pain in mechanically ventilated infants.

Validating skin conductance for measuring acute pain in mechanically ventilated infants

Measuring pain in mechanically ventilated infants is challenging. The measurement of skin conductance (SC) is based on the sympathetic nervous system response to stress. This study purpose was to evaluate the validity of SC for measuring pain in mechanically ventilated infants. A prospective cross-sectional observational design was used to study SC and its relation to: the category of procedure (i.e., painful or non-painful); the phase of procedure (i.e., before, during and after), and referent pain measures (i.e., Premature Infant Pain Profile-Revised (PIPP-R) and Neonatal Facial Coding System (NFCS)). Eligible infants were those up to 12 months of age, in intensive care units, who were mechanically ventilated, and required painful and non-painful procedures. From October 2017 to November 2018, 130 eligible infants were identified, and 55 infants were studied. SC (number of waves per second) during painful procedures (median 0.27, interquartile range 0.2-0.4) was statistically significantly higher than those during non-painful procedures (0, 0-0.09). SC during painful procedures was statistically significantly higher than those before (0, 0-0.07) and after painful procedures (0, 0-0.07). SC showed moderate statistically significant positive correlations with PIPP-R (Spearman's rho=0.4-0.62) and the four-item NFCS (Spearman's rho=0.31-0.67) before, during and after painful or non-painful procedures respectively. SC had excellent performance (area under the receiver operator curve=0.979) with excellent sensitivity (92.31%), specificity (95.42%) and negative predictive value (99.21%) but only sufficient positive predictive value (66.67%) when used to discriminate moderate-to-severe pain. This present study is the first to evaluate different sources of validity evidence of SC for pain measurement in the same population of infants during the same time period. Specifically, SC showed good validity for pain measurement in mechanically ventilated infants in relation to the category of procedure, the phase of painful and non-painful procedures and referent pain measures. This study was funded by the Canadian Pain Society (CPS) Trainee Research Award (Clinical Science, 2018-2019) and Sigma Theta Tau International/Rosemary Berkel Crisp Research Award (2018-2019). The first author (J. Hu) was supported by the Ontario Trillium Scholarship (2015-2019) and International Doctoral Scholarship.