Simini Boards Cast

Chapter 100 - Part C: Clefts and Oronasal Fistulas: When the Barrier Breaks

Simini Podcasts Season 1 Episode 136

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0:00 | 17:36

In this BoardsCast episode, we continue Tobias Chapter 100 - Palate by reframing palatal disease with the only mental model that matters:

This is not a feeding problem.It’s a barrier failure.

When the palate fails, the oral cavity and nasal passages stop being separate systems. Food, liquid, and oral bacteria cross into the nose — and the downstream consequence is predictable: chronic rhinitis, nasal reflux, and aspiration risk. 

You’ll learn:

  • The separation system: hard palate = wall, soft palate = valve
  • The 3 ways the barrier breaks: congenital clefts, traumatic clefts, oronasal fistulas
  • Why congenital clefts are midline defects (failure of palatal shelf fusion ~days 25–28 gestation in dogs) 
  • Why neonates fail to thrive: can’t create suction + milk reflux → aspiration pneumonia
  • Why traumatic repairs often need delay (especially burns/gunshot): wait for necrosis to “declare” before you rebuild 
  • Why dental disease causes the common fistula: maxillary canine roots sit against a paper-thin barrier to the nasal cavity 
  • The two surgical rules that decide success: tension-free closure + preserve blood supply (first attempt is your best shot) 

Key takeaway: when separation fails, every swallow becomes a respiratory event.

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