Distributive shock (profound decrease in systemic vascular tone)

•  Sepsis
•  Pancreatitis
•  Anaphylaxis
•  Neurogenic (e.g., spinal cord injury)
•  Endocrine-related (Addison's disease, myxedema)

Cardiogenic shock

•  Myopathic (acute MI, fulminant myocarditis)
•  Mechanical (acute severe mitral regurgitation, acute severe aortic insufficiency [e.g., aortic dissection], severe aortic stenosis, acute VSD)
•  Arrhythmic

Obstructive shock

•  Pericardial tamponade
•  Massive pulmonary embolism
•  Tension pneumothorax

• Hypovolemic shock
•  Hemorrhage
•  GI losses (vomiting, diarrhea)
•  Burns
•  Polyuria (diabetic ketoacidosis, diabetes insipidus)