Causes of Delirium (Medical Mnemonics)

DELIRIUMS

D	Drugs
E	Eyes, ears (Disorientation)
L	Low oxygen (MI, ARDS, PE, CHF, COPD)
I
R	Retention (Urine, Stool)/ Restrains
I	Ictal
U	Underhydration/ Undernutrition
M	Metabolic
S	Subdural/ Sleep deprivation

Further Reading