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Teach V/Q mismatch:matched units, shunt, dead space & why oxygen sometimes fails
V/Q mismatch is at the heart of respiratory support. SBD V/Q is an interactive teaching cartoon of ventilation–perfusion mismatch — how air (V) must meet blood (Q) in the lung. See three units side by side: Matched — blue blood turns red Shunt — blood with no air; stays blue Dead space — air with no blood Drag A–a and FiO2. Restore room air. Watch PaO2 in blood versus PAO2 in the alveolus, Mix SaO2, and why raising oxygen helps low V/Q but shrugs at true shunt. Tabs Play — three units, gases, chips (Normal, Atelectasis, Embolus, Mixed) Shunt — Qs/Qt, the 100% oxygen test, unused air TYPE 1&2 — hypoxaemic versus hypercapnic failure Res — the papers this cartoon stands on Book and Math — the written walk and the teaching equations For students, residents, and teachers of physiology and intensive care. Simulated units only. This is not a medical device. Do not use V/Q to diagnose, treat, monitor, or decide ventilation for a real patient. Educational use only. Not for clinical use. SBD teaching · v1.26