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In page Shock (circulatory):

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Obstructive shock is a form of shock associated with physical obstruction of the great vessels of the systemic or pulmonary circulation.[1] Several conditions can result in this form of shock.

  • Tension pneumothorax; Through increased intrathoracic pressure, venous return is impeded.[2]
  • Pulmonary embolism is thromboembolism of the lungs, hindering oxygenation and return of blood to the heart.[citation needed]
  • Aortic stenosis hinders circulation by obstructing the cardiac output.[citation needed]