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Intro to Bronchoscopy: Lower Airway Anatomy -- BAVLS
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Intro to Bronchoscopy: Lower Airway Anatomy -- BAVLS

American Thoracic Society

4 chapters7 takeaways10 key terms5 questions

Overview

This video introduces the anatomy of the lower airways as viewed during flexible bronchoscopy. It guides learners through identifying key anatomical landmarks, understanding normal airway structures down to the segmental level, and demonstrates essential techniques for safe and effective navigation within the airways. The focus is on maintaining orientation, minimizing trauma, and systematically inspecting each lung segment.

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Chapters

  • Keep the bronchoscope tip centered in the airway to prevent trauma and improve visualization for both the operator and observers.
  • If visualization is lost, use gentle suction, saline instillation, or wipe the tip on the tracheal wall; if still unclear, pull back to a recognizable landmark like the carina.
  • Administer lidocaine before entering the trachea and at any carina to manage cough reflex, waiting for it to take effect before advancing.
Adhering to these navigation rules is crucial for patient safety, minimizing airway injury, and ensuring a clear view for accurate anatomical assessment during bronchoscopy.
If you cannot see where you are going, pull back until you reach a point that you recognize, which is usually the main carina.
  • The trachea has a C-shaped anterior wall supported by cartilaginous rings and a membranous posterior wall with longitudinal striations that can collapse.
  • The main carina, where the trachea divides into the main bronchi, should appear sharp.
  • Lidocaine is administered at the carina to suppress coughing before advancing into the main stem bronchi.
Understanding the distinct characteristics of the tracheal walls and the significance of the carina helps in orientation and in anticipating patient responses like coughing, which can be managed with anesthesia.
Lidocaine is administered at the main carina prior to advancing into the main stem bronchi because these areas are prone to causing cough.
  • The left lung has two lobes: upper and lower.
  • The left upper lobe bronchus branches anterolaterally, dividing into the lingula (superior and inferior segments) and other left upper lobe segments (anterior, apicoposterior).
  • The left lower lobe superior segment bronchus branches posteriorly, just below the left upper lobe takeoff.
  • The remaining left lower lobe bronchi form the anteromedial, lateral, and posterior segments (mnemonic: ALP).
Knowing the branching patterns of the left lung allows for systematic inspection of all segmental bronchi, ensuring no areas are missed during the procedure.
The left lower lobe divides into anteromedial, lateral, and posterior segments, which can be remembered with the mnemonic ALP.
  • The right lung has three lobes: upper, middle, and lower.
  • The right upper lobe bronchus branches anterolaterally from the right main stem and has three segments (anterior, posterior, apical).
  • The bronchus intermedius connects the right upper lobe takeoff to the right middle lobe takeoff.
  • The right middle lobe branches anteromedially and has medial and lateral segments.
  • The superior segment of the right lower lobe branches posteriorly, and the medial basal segment branches medially, with anterior, lateral, and posterior basal segments following.
The right lung's anatomy is more complex due to the additional lobe and shorter bronchus intermedius, requiring careful navigation to visualize all segmental bronchi, including the right middle lobe and basal segments.
The right middle lobe takes off anteromedially, and the superior segment of the right lower lobe takes off posteriorly at the level of the right middle lobe bronchus.

Key takeaways

  1. 1Bronchoscopy requires meticulous navigation to avoid airway trauma and ensure complete visualization.
  2. 2Topical anesthesia, particularly lidocaine at carina, is essential for managing patient cough reflex.
  3. 3Understanding the hierarchical branching of bronchi in both left and right lungs is key to systematic inspection.
  4. 4The left lung has two lobes (upper, lower) with specific segmental branching patterns, including the lingula.
  5. 5The right lung has three lobes (upper, middle, lower) with distinct takeoff points for each lobe's bronchi.
  6. 6Systematic inspection down to the subsegmental carina is the goal of a complete airway examination.
  7. 7Familiarity with common anatomical variations develops with practice.

Key terms

BronchoscopyLower AirwaysAnatomical LandmarksSegmental BronchiCarinaTracheaLidocaineLingulaBronchus IntermediusBasal Segments

Test your understanding

  1. 1What are the primary safety rules to follow during flexible bronchoscopy to minimize airway trauma?
  2. 2How does the anatomy of the posterior tracheal wall differ from the anterior wall, and why is this distinction important?
  3. 3Describe the branching pattern of the left upper lobe bronchus and its segments.
  4. 4What is the bronchus intermedius, and where is it located in the right lung's bronchial tree?
  5. 5Why is it important to administer lidocaine at the carina before advancing the bronchoscope?

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