According to the Richmond Agitation-Sedation Scale (RASS), which score indicates moderate sedation where the patient is difficult to arouse but awakens to verbal stimuli?

Explanation

## Richmond Agitation-Sedation Scale (RASS) **Key Point:** The RASS is a 10-point scale (ranging from +4 to −5) used to assess level of consciousness and agitation in ICU patients. It is the gold standard for sedation monitoring in mechanically ventilated patients and guides titration of sedative agents. ### RASS Score Interpretation | RASS Score | Description | Clinical Behavior | |---|---|---| | +4 | Combative | Overtly combative, violent, immediate danger to staff | | +3 | Very agitated | Pulls or removes tubes/catheters; aggressive | | +2 | Agitated | Frequent non-purposeful movement, fights ventilator | | +1 | Restless | Anxious but movements not aggressive | | 0 | Alert and calm | Spontaneous eye opening, looks at examiner | | −1 | Drowsy | Not fully alert; opens eyes to verbal stimuli, sustained eye contact | | −2 | Light sedation | Briefly awakens to voice; opens eyes but no sustained eye contact | | **−3** | **Moderate sedation** | **Movement or eye opening to verbal stimuli but no eye contact; difficult to arouse** | | −4 | Deep sedation | No response to verbal stimuli; movement or eye opening to physical stimuli only | | −5 | Unarousable | No response to any stimuli | ### Why RASS −3 is the Correct Answer Per the official RASS scale (Sessler et al., AJRCCM 2002), **RASS −3 = Moderate sedation**: the patient is **difficult to arouse** and shows only movement or eye opening to verbal stimuli **without sustained eye contact**. This matches the stem's description of "moderate sedation where the patient is difficult to arouse but awakens to verbal stimuli." - **RASS −2 (Light sedation):** Patient briefly awakens and makes eye contact to voice (≤10 seconds) — this is *light*, not moderate, sedation. - **RASS 0:** Alert and calm — no sedation. - **RASS −4:** Deep sedation — no response to verbal stimuli at all; only responds to physical stimulation. ### Target RASS Scores in ICU - **Spontaneously breathing, non-intubated:** RASS 0 to −1 - **Mechanically ventilated (non-paralyzed):** RASS −1 to −2 (light sedation target per PADIS guidelines) - **Mechanically ventilated (paralyzed):** RASS −4 to −5 (deep sedation) **High-Yield:** The PADIS (Pain, Agitation/Sedation, Delirium, Immobility, Sleep) guidelines recommend targeting light sedation (RASS −1 to −2) for most ICU patients to reduce delirium and improve outcomes. **Clinical Pearl:** Excessive sedation (RASS ≤ −3) is associated with prolonged mechanical ventilation, ICU delirium, and worse outcomes. Daily sedation interruption and targeted light sedation improve patient outcomes (Kress et al., NEJM 2000; Sessler et al., AJRCCM 2002).