Simini Boards Cast
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🧠 Flashcard-style recaps + board-style questions
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Simini Boards Cast
Chapter 102 - Part C: Tracheal Collapse: The Disease You Can Hear
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In this BoardsCast episode, we continue Tobias Chapter 102 — Trachea and Bronchi with the clinical sound you recognize before you even see the dog:
that dry, honking “goose” cough.
It sounds like irritation. It sounds like an infection, but it’s neither.
Its structure is failing under pressure. Tracheal collapse isn’t a fixed obstruction — it’s a dynamic mechanical failure where normal breathing pressures expose a weakened airway, like a cheap vacuum hose that looks fine until suction starts.
You’ll learn:
- The core model: structural weakness + normal pressure changes = collapse
- Normal trachea anatomy: 35–46 C-shaped rings + dorsal trachealis membrane
- What fails in collapse: cartilage loses strength (GAG loss → dehydration) + dorsal membrane becomes lax and sags
- Why it’s so “on/off”: the same airway behaves differently at rest vs excitement/exercise
- The phase/location rule:
- Cervical (neck) collapse = inspiration
- Intrathoracic (chest) collapse = expiration
- The feedback loop that worsens everything: collapse → irritation → cough → pressure spikes → more collapse
- Why resting radiographs can miss it (dynamic problem) and why fluoroscopy/tracheoscopy are gold standards
Key takeaway: you’re not hearing infection — you’re hearing mechanics failing under pressure.
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