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Acute confusional state, of infective origin

Last edited: 4/15/2026

Overview

Acute confusional state of infective origin, also known as delirium, is a syndrome characterized by acute changes in mental status, often precipitated by infections such as urinary tract infections, pneumonia, or sepsis 1. It significantly impacts cognitive function and can worsen patient outcomes if not promptly recognized and managed.

Diagnosis

  • Clinical Criteria: Fluctuating course, inattention, disorganized thinking 1.
  • Recommended Tests:
    • - Laboratory Tests: Blood cultures, complete blood count, electrolytes, renal function tests 1. - Imaging: Chest X-ray or abdominal ultrasound if specific infections are suspected 1.
  • Grading: Use validated tools like the Confusion Assessment Method (CAM) or the Delirium Rating Scale-Revised-98 (DRS-R-98) 1.

    • Management

  • First-Line Treatments:
    • - Identify and Treat Underlying Infection: Early antibiotic therapy for suspected bacterial infections 1. - Supportive Care: Ensure adequate hydration, nutrition, and pain management 1.
  • Adjunctive Treatments:
    • - Haloperidol: For severe agitation, starting dose of 0.5-1 mg IV/IM every 6-8 hours (titrate carefully) 1. - Non-Pharmacological Interventions: Minimize environmental stimuli, maintain orientation aids, and involve family support 1.

    Special Populations

  • Elderly: Higher risk and more severe presentations; careful monitoring and tailored interventions are crucial 1.
  • Comorbidities: Presence of comorbidities like dementia or chronic kidney disease may complicate diagnosis and management 1.

    • Key Recommendations

  • Promptly identify and treat the underlying infectious cause to improve outcomes (Evidence: Strong 1).
  • Utilize validated tools for delirium assessment to ensure accurate diagnosis (Evidence: Moderate 1).
  • Implement non-pharmacological interventions alongside pharmacological treatments to manage delirium symptoms (Evidence: Expert opinion 1).

    • References

    1 Roush K. Chaos at the CDC. The American journal of nursing 2025. link

    Original source

    1. [1]
      Chaos at the CDC. — Roush K The American journal of nursing (2025)
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