![]() Here’s a simplified 3-step system for thinking about respiratory failure in test questions: Shunting is commonly caused by pulmonary edema, hypoventilation is either neurological or neuromuscular in etiology, atelectasis is commonly seen in perioperative patients, and cases of hypoperfusion can be found in shock. ![]() Uworld says this is v/q mismatch but that gets me confused cause why wouldn't a vent defect give v/q mismatch.Using this mnemonic, you can simplify the order of the four types of respiratory failure as Shunting, increased CO2 (hypoventilation), Atelectasis, and Hypoperfusion. 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. Dead space/physiologic dead space/V/Q mismatch to inifinty.I remember total pulm shunt as if pulm art partial pressure = pulm vein partial pressure, shunted, basically just bypassed lungs. These alveolar are already extracting maximum oxygen, adding more would not help. Lets assume this kid have some alveoli that are working. pulm shunting - ventilation defect V/Q 0, perfusion intact.So this is my understanding of the topic and I might be wrong so please correct me if thats the case:
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |