Simini Boards Cast
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Simini Boards Cast
Chapter 123 - Part C: Why Otitis Media Happens: The Three Routes of Invasion
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In this BoardsCast episode, we continue Tobias Chapter 123 — Middle and Inner Ear by killing the most common wrong question in otitis media:
You cultured bacteria. You found pus in the bulla. Everyone asks what bug it is.
Wrong question. The real question is: how did it get there?
Because pathogens don’t teleport. Middle ear infection is a logistics problem: a sealed bony vault was breached, and there are only three possible routes of invasion.
In this episode, you’ll learn:
- The 3 routes into the middle ear:
- From the external canal through/around the tympanic membrane (classic in dogs)
- From the nasopharynx up the auditory tube (classic in cats)
- Hematogenous spread (possible, but uncommon—don’t chase zebras)
- Why dogs can have septic otitis media even with an “intact” tympanic membrane: chronic otitis externa creates transmembrane migration or a rupture-then-heal-over trap
- Why cats are different: URI-driven auditory tube dysfunction → vacuum/effusion → inflammatory polyps → secondary infection
- The strategic mantra that prevents relapse: Find the road. Close the road. (Treat the route, not just the organism)
Key takeaway: The bug is often the symptom. The route is the disease.
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