The Nature Reviews Disease Primers journal has an article on Delirium which provides a comprehensive summary with sections on epidemiology; mechanisms/pathophysiology; brain energy metabolism; inflammation; drugs, stress and neurotransmitter imbalance; neuranatomical substrates and failure of network connectivity; diagnosis, screening and prevention; assessment in different settings; ultra-brief screening tools; assessing delirium severity; non-pharmacological and pharmacological interventions; management; treatment in different settings; quality of life; and outlook.
The article can be downloaded as a PDF, and includes diagrams.