3A's: Three Airways: Airway obstruction, Anaphylaxis, Asthma
3P's: Three Pulmonary's: Pneumothorax, PE, Pulmonary edema
3C's: Three Cardiacs: Cardiogenic pulmonary edema, Cardiac ischemia, Cardiac tamponade
3M's: Three Metabolics: (DOC) DKA, Organophosphates, Carbon monoxide poisoning