Totally depends on
type: septic, hemorrhagic/hypovolemic, cardiogenic, anaphylactic, neurogenic, metabolic, pulmonic.
The end commonality in all is that you get vascular dilation so severe that the blood pressure
ultimately bottoms out and you don't get perfusion to critical organs causing multi organ system failure. In the ICU we give patients pressors to maintain their BP. The brain & heart
take the biggest hits.