Pain, Sleep and Palliative and End-of-Life Care

Pain Assessment and the Analgesia-First Approach

Accurate pain assessment is essential to providing high-quality critical care. The patient's self-report is the most reliable indicator of pain intensity and must be sought whenever possible. In patients who are awake and able to communicate, asking them directly about their pain provides the gold standard assessment. Critical illness, delirium, or sedation may prevent reliable self-report, but an intubated patient who can communicate by writing, pointing, or another method should still self-report pain; use a validated behavioral tool only when reliable self-report is not possible.

When patients cannot self-report, two validated behavioral scales guide bedside assessment: the Critical-Care Pain Observation Tool (CPOT) and the Behavioral Pain Scale (BPS). The CPOT evaluates facial expression, body movements, muscle tension, and compliance with the ventilator or vocalization. A CPOT score greater than 2 suggests pain in a patient unable to self-report; nurses must interpret this score alongside the clinical context and reassess after interventions. The BPS assesses facial expression, upper limb movements, and compliance with mechanical ventilation on a scale from 3 to 12. Importantly, vital sign changes such as tachycardia and hypertension are non-specific and must not be used alone to verify the presence or absence of pain. An elevated blood pressure may reflect fear, agitation, or vasoactive medication rather than acute pain; hypovolemia more commonly causes hypotension, especially as shock progresses.

Special assessment challenges arise in patients receiving neuromuscular blocking agents. Neuromuscular blockade completely prevents behavioral pain assessment because skeletal muscles are paralyzed. In these situations, the critical care registered nurse must maintain ordered analgesia and sedation, carefully assessing for possible distress using the clinical context and available physiologic indicators. Furthermore, nurses should provide ordered preprocedural analgesia before predictably painful ICU care, such as wound care or chest tube removal, and closely monitor both its effect and adverse effects.

Modern critical care emphasizes analgesia-first sedation, also known as analgosedation. This approach prioritizes identifying and treating pain before administering sedatives to achieve target comfort scores. By treating underlying discomfort first, patients frequently require lower sedative doses, which promotes earlier awakening and recovery.