![]() Giving O2 will not work here.Ī shunt is not a VQ mismatch. Transposition of the great vessels is a shunt. Another memory hook here is.theres a reason you do a “VQ scan for a pulmonaryĪnatomical dead spacing on the other hand is a ventilation issue. Your lungs can dilate other arteries to make up for the deficient flow sections and absorb more O2 from other areas. ![]() ![]() In PE, the problem is that there is a blood clot (or air/fat embolus) that is blocking blood flow. ![]() The fact that O2 works proves it is a perfusion issue (you are optimizing the thing that still works.ventilation). If it was a ventilation issue, how would adding more O2 ‘ventilating’ so to speak work? It wouldn't. You can make a memory hook into thinking that there has to be a reason you'd see a PE patient in the ER getting O2 (its not for theatrics).Īnd it's because it's a perfusion issue. ![]()
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