What is the interpretation of a Confusion Assessment Method–Severity (CAM‑S) short‑form score of 3 and long‑form score of 5 in a patient with delirium?

CAM-S Score Interpretation

A CAM-S short-form score of 3 and long-form score of 5 indicate mild-to-moderate delirium severity that warrants immediate investigation of underlying causes and close monitoring, as these scores predict significantly increased hospital length of stay and elevated risk of adverse outcomes including death or nursing home placement at 90 days. 1

Understanding the CAM-S Scoring System

The Confusion Assessment Method-Severity (CAM-S) quantifies delirium severity using either:

• Short form: 4 items, scored 0-7 (higher scores = more severe)
• Long form: 10 items, scored 0-19 (higher scores = more severe) 1

Your patient's scores (short-form 3, long-form 5) fall into the mild-to-moderate severity range based on validation studies. 1

Clinical Significance of These Specific Scores

Hospital Length of Stay Impact

• Patients with CAM-S short-form scores in the 3-4 range have adjusted mean length of stay of approximately 8-10 days, compared to 6.5 days for those without delirium 1
• CAM-S long-form scores of 5-6 similarly predict extended hospitalizations of 8-9 days versus 5.6 days for non-delirious patients 1

90-Day Mortality and Nursing Home Risk

• These severity levels confer an adjusted relative risk of approximately 1.5-2.0 for the composite outcome of death or nursing home residence at 90 days, compared to patients without delirium 1
• The risk increases progressively with higher scores, reaching relative risk of 2.5 at the highest severity levels 1

Immediate Clinical Actions Required

Identify and Treat Underlying Causes

• Infection screening: Urinalysis and chest radiography are essential, as urinary tract infections and pneumonia are the most frequent precipitating infections 2, 3
• Medication review: Examine all current medications with special attention to anticholinergics, sedatives, opioids, and recent additions or dose changes 3, 4
• Metabolic workup: Check blood glucose immediately, comprehensive metabolic panel, complete blood count, and thyroid function tests 3
• Substance-related causes: Assess for alcohol use and withdrawal risk 3

Neuroimaging Considerations

• CT head without contrast is indicated if your patient has focal neurological deficits, recent head trauma or falls, new-onset seizures, or therapeutic anticoagulation use 3
• Neuroimaging is not routinely required if a clear precipitant (infection, medication, metabolic disturbance) is identified and no focal neurological findings are present 3

Monitoring Strategy

Assessment Frequency

• Perform delirium screening every 8-12 hours (at least once per nursing shift) using the CAM or CAM-S, as mental status fluctuates substantially throughout the day 3, 5
• Track the sum of all CAM-S scores across the hospitalization, as this combined measure of intensity and duration has the strongest association with post-hospital outcomes 6

Prognostic Tracking

The total cumulative CAM-S score (sum of all daily scores) is the most powerful predictor of 30- and 90-day outcomes. 6 For example, patients with cumulative scores in the "moderate" range have relative risk of 2.9 for 30-day mortality, while "high" cumulative scores confer relative risk of 6.4. 6

Critical Pitfalls to Avoid

Hypoactive Delirium Recognition

• Hypoactive delirium accounts for 71% of cases and is frequently missed by clinical teams, often mistaken for depression or fatigue 4, 7
• Your patient's mild-to-moderate scores may reflect hypoactive presentation, which tends to be less severe but still requires full investigation 7

Subsyndromal Delirium

• Patients with CAM-S scores indicating delirium symptoms who do not meet full CAM diagnostic criteria still experience worse outcomes than those without symptoms (27% vs 0% nursing home placement or death at 6 months) 7
• Even "mild" delirium by CAM-S scoring requires aggressive management 7

Superimposed on Dementia

• Do not attribute acute symptoms to pre-existing dementia without investigating for acute reversible causes, as delirium commonly occurs superimposed on dementia 4
• Obtain collateral history from family or caregivers about baseline cognitive function before the current episode 2, 4

Non-Pharmacological Management

Implement multicomponent interventions targeting:

• Cognitive impairment: Reorientation by staff and family, orientation whiteboard, visible clock, cognitive stimulating activities 2
• Sensory impairment: Ensure eyeglasses and hearing aids are available and functional 2
• Immobility: Encourage active range-of-motion exercises and early mobilization 2