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Right upper lobe anatomy revisited: a computed tomography scan study.

Jean S Bussières1,2, Michel Gingras3, Lindsay Perron4

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This study measured right main stem bronchus (RMSB) length and right upper lobe bronchus (RULB) angulation using CT scans. Findings improve understanding of bronchial anatomy for thoracic surgery lung isolation.

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Area of Science:

  • Thoracic surgery
  • Anesthesiology
  • Medical imaging

Background:

  • Double lumen tubes (DLTs) are standard for lung isolation in thoracic surgery.
  • Right-sided DLTs (R-DLTs) are less favored due to variable right main stem bronchus (RMSB) anatomy.
  • Challenges include RMSB length and right upper lobe bronchus (RULB) orifice misalignment.

Purpose of the Study:

  • To validate an alternative method for estimating RMSB length.
  • To determine the distribution of RULB ostium angulation.
  • To enhance understanding of right bronchial tree anatomy for improved lung isolation device selection.

Main Methods:

  • High-resolution computed tomography (CT) scans from 106 patients were analyzed.
  • RMSB length was measured using Kim's method and a carina-to-carina method.
  • RULB origin angle relative to the RMSB was measured; inter-observer variation was assessed.

Main Results:

  • Mean RMSB length: Kim's method 25.5 mm, carina-to-carina method 29.4 mm.
  • Both methods showed substantial inter-observer agreement (ICC = 0.84 and 0.95, respectively).
  • RULB angulation exhibited wide variation (mean 0.1°, range -28.6° to 21.2°).

Conclusions:

  • Anatomical variations in the right bronchial tree are significant.
  • Measurements provide insights into RMSB length and RULB angulation.
  • Findings can guide thoracic anesthesiologists in selecting appropriate lung isolation devices.