I originally learned them as:
CHEAP MD
Cardiac Tamponade
Hypoxia, Hypovolemia, Hydrogen Ions, Hyper (Hypo) glycemia, Hyper (hypo) kalemia
Embolus PE and Embolus MI
Acidose
Pneumothorax
Myocardial Infarction
Drug Overdose
Now that it's the 6 H's and 6 T's..............I just remember them individually..........and remember they are not just the differential diagnosis for PEA anymore...........but also apply to bradycardias, tachycardias, as well as PEA.
Hypovolemia
Hypoxia
Hydrogen ions
Hyper & Hypokalemia
Hyper & Hypoglycemia
Hypothermia
Trauma
Tension Pneumothorax
Thrombus MI
Thrombus PE
Trauma
Toxins or Tablets