​Differential diagnosis of high U wave on ECG are : 
-drugs 
-hypokalemia 
-bradycardia 
-left ventricular hypertrophy 
-hyperthyroidism 
-high vagal tone 
-diabetes mellitus 
-cardiomyopathy 

​Differential diagnosis of general causes of delirium are :
-typhoid fever
-pneumonia
-acidosis
-post hypoxia
-rheumatic fever
-septicemia
-hepatic encephalopathy
-hypoglycemia
-thyrotoxicosis
-post operative states
-post conclusive states

​Differential diagnosis of neurological causes of delirium are :
-cerebral masses
-cerebral contusion
-viral encephalitis
-bacterial meningitis ( tuberculosis)
-subarachnoid hemorrhage 

​Differential diagnosis of toxins causing delirium are : 
-heavy metals
-organophosphates 
-methyl alcohol 

​Differential diagnosis of herbal medications causing delirium are : 
-henbane
-valerian 
-Jimson weed
-atropa belladonna extract
-mandrake 

​Differential diagnosis of gastrointestinal agents causing delirium are : 
-loperamide 
-H2 receptor blockers 
-anti spasmotics
-antiemetics