What are the ABCD of medical emergency?

ABCDE principles Causally focused treatment can then be instituted. The mnemonic “ABCDE” stands for Airway, Breathing, Circulation, Disability, and Exposure. First, life-threatening airway problems are assessed and treated; second, life-threatening breathing problems are assessed and treated; and so on. 31-Jan-2012

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3273374/#:~:text=ABCDE%20principles&text=Causally%20focused%20treatment%20can%20then,and%20treated%3B%20and%20so%20on.