Neonatal Pain, Agitation and Sedation Scale (N-PASS)
Neonatal Pain, Agitation and Sedation Scale · Also known as: N-PASS
The N-PASS is a five-item behavioral and physiological assessment tool designed to measure pain, agitation, and sedation in neonates across the full spectrum from profound sedation to severe pain. Developed by Hummel et al. in 2008, it is validated for both ventilated and non-ventilated infants in NICU settings and provides a rapid bedside assessment combining facial expression, extremity tone, vital sign changes, state of consciousness, and cry characteristics.
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When to use it
N-PASS is indicated for all neonates in the NICU, including both ventilated and spontaneously breathing infants. It is particularly valuable for: (1) mechanically ventilated infants requiring sedation/analgesia titration; (2) post-operative neonates; (3) neonates undergoing painful procedures (lumbar puncture, chest tube placement, line insertion); (4) preterm infants (<32 weeks) who have limited behavioral communication; (5) serial monitoring during hospitalization to optimize medication levels and prevent both inadequate pain control and excessive sedation-related complications.
Strengths & limitations
- Bidirectional scale captures both pain and sedation on a single instrument, avoiding missed over-sedation while treating pain.
- Combines behavioral and physiological indicators, increasing sensitivity to neonatal distress in infants who cannot vocalize discomfort.
- Validated across gestational ages (preterm to term) and acuity levels (non-ventilated to heavily sedated NICU patients).
- Rapid bedside assessment (1–2 minutes) feasible within routine NICU monitoring workflow.
- Strong inter-rater reliability (ICC 0.81–0.89 reported in validation studies) with minimal clinician training required.
- Vital sign component assumes normal baseline hemodynamics; infants with congenital heart disease, sepsis, or shock may have abnormal baselines requiring adjusted interpretation.
- Behavioral items may be difficult to score accurately in profoundly sedated, paralyzed, or neurologically injured infants where minimal behavioral response occurs.
- Facial expression and extremity tone scoring may be confounded by routine handling, diaper changes, or CPAP/nasal prongs that obscure facial features.
- No formal validation in extreme prematurity (<22 weeks) or in infants with severe neuromuscular disease.
- Does not distinguish between pain and non-pain agitation (e.g., hunger, discomfort, neurological irritability).
Frequently asked
What is the difference between N-PASS and other neonatal pain scales like PIPP?
The PIPP (Premature Infant Pain Profile) focuses narrowly on acute procedural pain and includes gestational age weighting; N-PASS is broader, covering both pain and sedation across a wider spectrum and applicable to any clinical context (procedural, post-operative, chronic discomfort). N-PASS is bidirectional (-10 to +10) whereas PIPP is unidirectional (0–21 pain only). Choice depends on clinical context: PIPP for acute procedures in preterm infants; N-PASS for ongoing NICU management of ventilated patients.
How often should N-PASS be performed in a ventilated neonate?
Current best practice recommends N-PASS assessment every 2–4 hours for baseline monitoring, with additional assessments before and after painful procedures, medication adjustments, or significant clinical changes. Some NICUs using sedation protocols perform every-hour reassessment during acute phases of illness; protocols vary by institution. Documentation of time, score, and action taken (medication change, non-pharmacological intervention) supports continuity of care.
Can N-PASS be reliably scored in a paralyzed, deeply sedated infant?
Scoring in paralyzed infants is challenging because behavioral items (facial expression, extremity tone, behavioral state) cannot be observed when neuromuscular blockade is active. In this context, clinicians must rely more heavily on vital sign changes and clinical context, recognizing that the behavioral portion of N-PASS is limited. Some NICUs recommend scoring only the vital sign component or using alternative tools (e.g., pharmacokinetic/pharmacodynamic drug level monitoring) when paralysis precludes behavioral observation.
What are target N-PASS scores for different clinical scenarios?
For mechanically ventilated neonates requiring sedation, target N-PASS scores typically range from -2 to +2 (light sedation with arousability) to 0 to +2 (minimal sedation) depending on institutional protocol and clinical stability. Post-extubation, scores of -1 to +1 are often targeted to minimize re-intubation risk while maintaining comfort. For non-intubated infants, scores near 0 reflect comfort. Scores persistently above +4 warrant analgesic escalation; scores below -4 warrant sedative reduction to avoid excessive suppression.
Sources
- Hummel, P., Puchalski, M., Creech, S. D., & Weiss, M. G. (2008). Clinical Reliability and Validity of the N-PASS: Neonatal Pain, Agitation and Sedation Scale with Prolonged Ventilation Patients. Journal of Perinatology, 28(1), 55-60. DOI: 10.1038/sj.jp.7211861 ↗
- Hummel, P. (2008). Neonatal Pain, Agitation and Sedation Scale. Advances in Neonatal Care, 8(5), 285-287. link ↗
How to cite this page
ScholarGate. (2026, June 3). Neonatal Pain, Agitation and Sedation Scale. ScholarGate. https://scholargate.app/en/neonatology/neonatal-pain-agitation-sedation
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