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Related Experiment Video

Updated: Nov 5, 2025

Endotracheal Intubation Using a Flexible Intubation Endoscope as a Standardized Model for Safe Airway Management in Swine
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A pilot study comparing three bend angles for lighted stylet intubation.

Dongwook Won1, Jung-Man Lee2, Jiwon Lee3

  • 1Department of Anesthesiology and Pain Medicine, Seoul Metropolitan Government Seoul National University Boramae Medical Center, Seoul National University College of Medicine, 20 Boramae-ro 5-gil, Dongjak-gu, 07061, Seoul, Republic of Korea.

BMC Anesthesiology
|May 18, 2021
PubMed
Summary
This summary is machine-generated.

A 70-degree bend angle for lighted stylet intubation resulted in longer procedure times and increased postoperative sore throat (POST). An 80-degree angle appears optimal for balancing intubation success and patient comfort.

Keywords:
Lighted styletPostoperative sore throatTracheal intubation

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Area of Science:

  • Anesthesiology
  • Airway Management
  • Medical Devices

Background:

  • Successful lighted stylet intubation requires an appropriate bend angle.
  • Optimal angle selection is crucial for intubation efficiency and patient outcomes.

Purpose of the Study:

  • To compare the efficacy of 70, 80, and 90-degree bend angles for lighted stylet intubation.
  • To evaluate the impact of different bend angles on intubation success rates, procedure time, and postoperative sore throat (POST).

Main Methods:

  • Patients were randomized into three groups receiving a lighted stylet bent at 70, 80, or 90 degrees.
  • Success rates (first attempt and overall), intubation search time, and POST were assessed at 2, 4, and 24 hours post-procedure.

Main Results:

  • No significant difference in first-attempt or overall success rates among the three angles (p > 0.14).
  • Intubation search time was significantly longer with the 70-degree angle compared to 80 and 90 degrees (p < 0.001).
  • Postoperative sore throat (POST) was significantly lower with the 80-degree angle compared to the 90-degree angle at 2 and 4 hours (p < 0.016).

Conclusions:

  • The bend angle of the lighted stylet influences intubation time and POST.
  • While 80 and 90 degrees are acceptable for success rates, the 80-degree angle may offer a better balance between efficacy and patient comfort.