Nonverbal Pain Scale (NVPS)

Why use it

Pain is present in up to 50% of ICU patients and is a major contributor to patient distress, physiological deterioration, delirium, and post-ICU psychological sequelae. Non-communicative and mechanically ventilated patients cannot use standard self-report scales (NRS, VAS). The NVPS provides a standardized, reproducible framework for nurses and clinicians to detect and quantify pain objectively, enabling timely analgesic intervention and reassessment. The 2018 PADIS (Pain, Agitation/sedation, Delirium, Immobility, Sleep disruption) guidelines from SCCM recommend routine pain assessment using behavioral tools in all non-communicative ICU patients.

About

The Nonverbal Pain Scale (NVPS) is a validated behavioral observation pain assessment tool developed by Odhner and colleagues and published in the AORN Journal in 2003. It was originally designed for the postoperative setting and subsequently validated for use in non-communicative, mechanically ventilated, and sedated ICU patients who are unable to provide self-reported pain ratings. The NVPS evaluates five domains: (1) Face — observed facial expressions of distress; (2) Activity/Movement — body movement and restlessness; (3) Guarding — protective posturing or splinting of painful areas; (4) Physiology (Vital Signs) — changes in heart rate, respiratory rate, and oxygen saturation compared to baseline; and (5) Respiratory — breathing pattern, ventilator synchrony, and oxygen status. Each domain is scored 0–2, generating a total score of 0–10. The scale is complementary to other validated ICU pain tools such as the Behavioral Pain Scale (BPS) and the Critical-Care Pain Observation Tool (CPOT). Per SCCM/ACCM guidelines (2013, 2018), routine pain assessment using validated behavioral tools is mandatory for all ICU patients unable to self-report, and the NVPS meets this requirement.

When to use

• Mechanically ventilated or intubated patients who cannot communicate pain verbally
• Sedated patients in the ICU or post-anesthesia care unit (PACU) after surgery
• Patients with neuromuscular blockade, altered consciousness, or severe dementia who cannot self-report pain
• Any non-communicative patient during nursing interventions (turning, suctioning, wound care) to detect procedure-related pain
• Post-operative assessment in patients slow to recover consciousness
• Serial pain assessment to evaluate analgesic response — administer before and 30–60 minutes after analgesic administration
• NOT validated for patients who can communicate — use self-report tools (NRS 0–10, VAS) for communicative patients

Formula

Pearls & pitfalls

• The Physiology domain (Domain 4) should always be compared against the PATIENT'S OWN BASELINE vital signs — not population normal ranges. A heart rate change of >10% from the patient's baseline is the threshold for scoring.
• Vital sign changes alone (tachycardia, hypertension) are NOT specific for pain — they can also reflect agitation, delirium, fever, or hemodynamic instability. Integrate with behavioral observations.
• Sedation confounds the NVPS — in deeply sedated patients (RASS -4 to -5), all behavioral scores may be 0 regardless of pain. Consider dose reduction or sedation lightening before pain assessment where clinically safe.
• The NVPS Respiratory domain uniquely captures ventilator asynchrony — a patient fighting the ventilator (item score 2) may indicate pain, agitation, or inadequate sedation and should trigger immediate assessment.
• The PADIS guidelines recommend the CPOT and BPS as first-line ICU pain scales due to the strongest level of evidence, but the NVPS is widely used and validated in the same population.
• Assess NVPS routinely at a minimum every 4 hours in ICU patients and during every painful nursing procedure (repositioning, suctioning, line insertion, wound care, physiotherapy).
• Multimodal analgesia is preferred over opioid monotherapy in ICU patients — ketamine, acetaminophen, NSAIDs (if not contraindicated), dexmedetomidine, and regional nerve blocks can reduce opioid requirements and opioid-related adverse effects.
• A score of ≥4 consistently across serial assessments (refractory pain) should trigger escalation to the ICU pharmacist, anesthesia pain team, or palliative care consultation.
• The NVPS was originally validated for postoperative adult patients; data support its use in medical ICU populations. Evidence in pediatric or neonatal patients is limited — use age-appropriate validated tools (NIPS, FLACC, CRIES) in children.

Next steps

NVPS 0 (No Pain): Continue current analgesia and reassess at next scheduled interval (every 2–4 hours in ICU). NVPS 1–3 (Mild Pain): Non-pharmacological comfort measures (repositioning, oral care, family presence). Consider analgesic optimization if score persists. NVPS 4–6 (Moderate Pain): Analgesic intervention indicated. Administer scheduled or PRN opioid per order set (IV morphine, hydromorphone, or fentanyl). Reassess within 30–60 minutes. NVPS 7–10 (Severe Pain): Urgent analgesic intervention. IV bolus opioid or ketamine per pain protocol. Investigate and treat underlying cause (wound, positioning, suctioning, procedural pain). Reassess within 30 minutes. Consider anesthesia/pain specialist input if refractory.

Evidence

Odhner M et al. Assessing pain control in nonverbal critically ill adults. Dimens Crit Care Nurs. 2003;22(6):260-267. PMID:14710829. Original development and pilot validation in postoperative adult patients. Inter-rater reliability kappa 0.61–0.80. Marmo L, Fowler S. Pain assessment tool in the critically ill post-open heart surgery patient population. Pain Manag Nurs. 2010;11(3):134-140. — validation in cardiac surgical ICU patients. Devlin JW et al. Clinical Practice Guidelines for the Prevention and Management of Pain, Agitation/Sedation, Delirium, Immobility, and Sleep Disruption in Adult Patients in the ICU (PADIS). Crit Care Med. 2018;46(9):e825-e873. PMID:30113379.

References

1. Odhner M et al. Assessing pain control in nonverbal critically ill adults. Dimens Crit Care Nurs. 2003;22(6):260-267. — link
2. Marmo L, Fowler S. Pain assessment tool in the critically ill post-open heart surgery patient population. Pain Manag Nurs. 2010;11(3):134-140. — link
3. Devlin JW et al. Clinical Practice Guidelines for the Prevention and Management of Pain, Agitation/Sedation, Delirium, Immobility, and Sleep Disruption in Adult Patients in the ICU (PADIS). Crit Care Med. 2018;46(9):e825-e873. — link
4. Puntillo KA et al. Practices and predictors of analgesic interventions for adults undergoing painful procedures in the intensive care unit. Crit Care Med. 2002;30(3):526-532. — link
5. Gelinas C et al. Validation of the Critical-Care Pain Observation Tool in adult patients. Am J Crit Care. 2006;15(4):420-427. — link