Paramedic here: Anaphylactic shock is considered the most serious level of allergic reactions (Generally the levels are: Mild, moderate, severe and anaphylactic shock).
Anaphylactic Shock is a form of distributive shock, where due to vaso- dilation, the blood circulates at a very low pressure.
Shock itself (the lack of oxygen perfusion to organs and tissue), can be divided into three stages: 1- Compensated (no loss of blood pressure), 2- Decompensated (body can no longer compensate and blood pressure begins to drop) 3- Irreversible (lack of blood/oxygen circulation has started a chain reaction of cellular/tissue/organ death that will inevitably lead to death)
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