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Richmond Agitation-Sedation Scale

Also known as: RASS, Sedation scale, Agitation scale

OriginatorChristopher N. Sessler, et al.Year2002Sources2Related methods6

The Richmond Agitation-Sedation Scale (RASS), developed by Sessler et al. in 2002, is a 10-level ordinal scale for assessing level of consciousness, agitation, and sedation in critically ill patients. It ranges from +4 (combative/violent) through 0 (alert and calm) to -5 (unarousable), enabling precise titration of sedative and analgesic medications in ICU settings.

Key highlights

  • Simple, quick assessment (< 1 minute) using bedside observation without equipment
  • Robust psychometric properties: high inter-observer reliability and validity across diverse ICU populations
  • Bidirectional scale enables assessment of both agitation and over-sedation with single tool
  • Target RASS (0 to -1) aligns with evidence on improved outcomes (reduced ventilator time, delirium, weakness)
  • Facilitates communication about sedation status among ICU team members

Intuition

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How it works

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When to use it

RASS is applied hourly (or per protocol) in all ICU patients on sedatives, analgesics, or mechanical ventilation to guide medication titration. It is used in combination with pain assessment (Behavioral Pain Scale or CPOT) to manage sedation-analgesia balance. RASS is applicable to alert patients as a baseline, though monitoring in conscious, communicative patients is less critical.

Strengths & limitations

Strengths
  • Simple, quick assessment (< 1 minute) using bedside observation without equipment
  • Robust psychometric properties: high inter-observer reliability and validity across diverse ICU populations
  • Bidirectional scale enables assessment of both agitation and over-sedation with single tool
  • Target RASS (0 to -1) aligns with evidence on improved outcomes (reduced ventilator time, delirium, weakness)
  • Facilitates communication about sedation status among ICU team members
Limitations
  • Does not assess cognitive function (delirium, confusion); use CAM-ICU in conjunction with RASS for delirium detection
  • Sedating medications and paralysis agents mask patient responsiveness; RASS may appear low even if patient perceives pain
  • Stimulation itself (physical touch, loud voice) can cause agitation in some patients, potentially biasing score
  • Does not differentiate causes of agitation (pain, anxiety, hypoxia, delirium, withdrawal); clinical context required
  • RASS may not be reliable in patients with altered brainstem function (severe stroke, seizures) where reflex responses dominate

Common pitfalls

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Applications

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Frequently asked

What is my target RASS score?

For most ICU patients, target RASS is 0 to -1 (alert and calm to drowsy). This balances comfort with safety and promotes earlier weaning from mechanical ventilation. Your ICU team will tailor target based on your condition and sedation needs.

Why does my RASS keep changing?

RASS is assessed hourly and adjusted based on your needs. If you are restless or agitated (RASS > 0), sedatives or pain medications increase. If you are oversedated (RASS < -2), medications decrease. This dynamic adjustment improves your comfort and recovery.

Can I have pain if my RASS shows I'm sedated?

Yes. Sedation and analgesia are separate. Even sedated patients may perceive pain. Your doctors assess pain using the Behavioral Pain Scale or CPOT and adjust analgesics independently of RASS. Always tell staff if you feel pain.

Is RASS the same as the Glasgow Coma Scale?

No. RASS is for ICU sedation and agitation assessment; GCS is for neurological status in brain injury. They are different tools for different purposes. Your ICU team may use RASS; neurology may use GCS.

Sources

  1. 1.
    Sessler, C. N., Gosnell, M. S., Grap, M. J., et al. (2002). The Richmond Agitation-Sedation Scale: validity and reliability in adult intensive care unit patients. American Journal of Respiratory and Critical Care Medicine, 166(10), 1338-1344.
    DOI 10.1164/rccm.2107138
  2. 2.
    Ely, E. W., Inouye, S. K., Bernard, G. R., et al. (2003). Delirium in mechanically ventilated patients: validity and reliability of the confusion assessment method for the ICU (CAM-ICU). JAMA, 286(21), 2703-2710.
    DOI 10.1001/jama.286.21.2703

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ScholarGate. (2026, June 3). Richmond Agitation-Sedation Scale. ScholarGate. https://scholargate.app/clinical-assessment/richmond-agitation-sedation