A 45 year old woman is admitted with hyperosmolar hyperglycaemic non-ketotic coma (HONK). A routine ECG is performed.
The referenced article takes good care of the latter. The former is immediately recogniseable and requires little further discussion.
Again, I extend my thanks to LITFL for making public their awesome and massive ECG library.
Weisberg, Lawrence S. "Management of severe hyperkalemia." Critical care medicine 36.12 (2008): 3246-3251.