Cardiogenic
Acute valvular Regurgitation/VSD
CHF
Dysrhythmia
ACS
Myocardial Contusion
Myocarditis
Drug toxicity (e.g. beta blocker, CCB, or bupropion OD)
Obstructive
Air embolism
Aortic Stenosis
Cardiac Tamponade
PE
Tension pneumothorax
Distributive
Adrenal crisis
Anaphylaxis<unk> 
Sepsis
Toxicologic
Hypovolemic
Severe dehydration
Hemorrhagic shock (traumatic and non-traumatic)
Acute valvular Regurgitation/VSD
CHF
Dysrhythmia
ACS
Myocardial Contusion
Myocarditis
Drug toxicity (e.g. beta blocker, CCB, or bupropion OD)
Air embolism
Aortic Stenosis
Cardiac Tamponade
PE
Tension pneumothorax
Adrenal crisis
Anaphylaxis<unk> 
Sepsis
Toxicologic
Severe dehydration
Hemorrhagic shock (traumatic and non-traumatic)
Penetrating neck trauma
Blunt neck trauma
Vertebral and carotid artery dissection
Strangulation
Whiplash injury
Cervical injury
Cervical fractures and dislocations
Cervical injury (peds)
Cervical spine clearance<unk> 
Spinal cord injury
Vertebral and carotid artery dissection
Strangulation
Whiplash injury
Cervical injury (peds)
Cervical spine clearance
Neurogenic shock
Cardiogenic
Spinal shock
Acute valvular Regurgitation/VSD
Undifferentiated shock 
CHF
Undifferentiated shock
Dysrhythmia