Low V/Q mismatch (shunt): This occurs when areas of the lung are perfused but not adequately ventilated, such as in conditions like pneumonia or pulmonary edema.
V/Q mismatch can happen in two main ways: Ventilation/perfusion (V/Q) mismatch describes disproportionate ventilation and blood flow in lung areas, impairing efficient gas exchange. Dead space is the volume of air not participating in gas exchange due to ventilation without perfusion. What is the Difference Between a Shunt, Dead Space, and V/Q Mismatch?Ī shunt refers to blood passing through the lungs without participating in gas exchange. Understanding these aspects is essential for appreciating the mechanisms underlying proper oxygenation and carbon dioxide removal in the body. This article provides an overview and explains these concepts, compares their characteristics and causes, and discusses their impact on respiratory health. The terms shunt, dead space, and ventilation/perfusion (V/Q) mismatch represent important concepts in pulmonary physiology, each indicating a distinct type of lung dysfunction that affects gas exchange. V/Q Mismatch: An Overview (2023)īy John Landry, BS, RRT | Updated: Jun 30, 2023 Uworld says this is v/q mismatch but that gets me confused cause why wouldn't a vent defect give v/q mismatch.Shunt vs.
That's why you will see a drop in PaO2 in PE(minor). So this one is tougher but: Let's assume you have a well ventilated alveoli, when there is poor oxygen content, vasculature will constrict and redistribute this blood to other alveolar however it will overwhelm the capacity of extracting oxygen into blood - so adding oxygen will help.
So this is my understanding of the topic and I might be wrong so please correct me if thats the case:
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