Pain Assessment in Critically Ill Patients

Evaluation of Pain

The American Society of Anesthesiologists recommends using validated behavioral scales, specifically the Behavioral Pain Scale (BPS) for intubated patients and the Critical-Care Pain Observation Tool (CPOT) for all ICU patients, as a standard method for pain assessment in patients who cannot effectively communicate their pain 1, 2, 3
The Society of Critical Care Medicine suggests that patients who can communicate verbally or non-verbally should be assessed using the Numerical Rating Scale (NRS) of 0-10 in a horizontal visual format, which is the most valid and feasible self-report instrument 3
The National Comprehensive Cancer Network recommends asking patients specifically about their "current", "worst", and "usual" pain over the last 24 hours 4
The success rate of the NRS visual scale is 91%, significantly higher than other scales 3
For patients who cannot use numerical scales, the Verbal Descriptor Scale (VDS) should be used 3

The American Geriatrics Society recommends using appropriate assessment tools for geriatric patients' cognitive abilities and performing extensive evaluation and questioning to overcome communication barriers 7
The Anesthesiology society notes that 42% of patients over 70 years old do not receive adequate analgesia despite reporting moderate to severe pain 8
The Society of Pediatric Anesthesia recommends that pediatric patients require developmentally appropriate pain assessment and multimodal therapy 7
The Journal of the National Comprehensive Cancer Network suggests using specific scales, such as the Pain Assessment in Advanced Dementia Scale (PAINAD) and the Checklist of Nonverbal Pain Indicators (CNPI), for patients with advanced dementia 4

The Critical Care Medicine journal reports that 82% of patients recall pain as the most traumatic memory of their ICU stay, and 38% maintain this memory 6 months after discharge 1, 2
The same journal notes that 17% of patients experience severe pain 6 months post-ICU, and 18% have a high risk of post-traumatic stress disorder 2
The Praxis Medical Insights guidelines summarize that untreated pain has physiological consequences, including increased catecholamines, vasoconstriction, hypermetabolism, hyperglycemia, and muscle degradation 9

The Praxis Medical Insights guidelines warn against underestimating pain in non-communicative patients and recommend always using behavioral assessment tools 9
The Intensive Care Medicine journal advises against relying solely on proxy assessments, as family members and clinicians often underestimate the patient's pain intensity 5
The Critical Care Medicine journal emphasizes the importance of preventive analgesia, as procedures can cause severe pain even with opioids administered, especially if the timing is inadequate 3