📘 Delirium ✅ Definition: Delirium is an acute, fluctuating, and reversible disturbance of consciousness, attention, cognition, and perception, often associated with an underlying medical condition. 🎯 Prevalence: ✅ Etiology (Causes): 📚 Mnemonic – DELIRIUM: | D – Drugs/Withdrawal (alcohol, benzodiazepines, opioids)| E – Electrolyte Imbalances (hyponatremia, hypercalcemia)| L – Lack of Drugs (sudden withdrawal, undertreatment of pain)| I – Infection (UTI, pneumonia, sepsis, meningitis)| R – Reduced Sensory Input (blindness,