Behavioral Pain Scale for Non‑Intubated Patients (BPS‑NI) – Evidence‑Based Guidelines

Scale Overview

• The BPS‑NI assesses facial expression, upper‑limb movements, and vocalization, each scored 1–4, yielding a total score from 3 (no pain) to 12 (maximum pain); scores ≥ 5 denote clinically significant pain that warrants analgesic intervention【1】【2】【3】.
• Facial‑expression scoring: 1 = relaxed, 2 = partially tightened/grimacing, 3 = fully tightened/eyelid closing, 4 = grimacing with tears【1】.

Psychometric Validation

• The BPS‑NI achieved a weighted validation score of 14.8, ranking it among the two most validated behavioral pain tools for non‑communicative ICU patients【1】【2】【3】【4】【5】【6】 (high‑quality evidence).

Clinical Application

• Recommended for non‑intubated ICU adults who cannot self‑report pain, including those with delirium【1】【2】【3】.
• The Society of Critical Care Medicine (SCCM) guidelines specifically endorse the BPS‑NI (alongside the CPOT) as having the greatest validity and reliability for pain monitoring in critically ill adults unable to self‑report【1】【2】【3】【4】【5】【6】 (strong recommendation).

Special Populations

• In patients with acute brain injury, the BPS‑NI is feasible and reliable, though observed pain behaviors may more closely reflect level of consciousness rather than classic grimacing or muscle rigidity【1】【2】【3】.

Practical Considerations

• The scale requires observable behaviors; it is unsuitable for patients who are deeply sedated or pharmacologically paralyzed【1】【2】【3】.
• Self‑report remains the gold standard; clinicians should first attempt a 0–10 Numeric Rating Scale before resorting to behavioral assessment【7】【1】【2】 (moderate evidence).
• Validated Mandarin translations of the BPS‑NI are available, supporting use in diverse linguistic populations【1】【2】.