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Predicting difficult airways: 3-3-2 rule or 3-3 rule?

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  • 1Department of Anesthesiology and Intensive Care Unit, Wannan Medical College First Affiliated Hospital, Yijishan Hospital, Wuhu, Anhui, China.

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The 3-3 rule and 3-3-2 rule effectively predict difficult airways, outperforming the 3-3-1 rule. A hyoid-thyroid distance under two fingers does not reliably predict difficult airways.

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Area of Science:

  • Anesthesiology
  • Airway Management
  • Predictive Diagnostics

Background:

  • Predicting difficult airways is crucial for patient safety during anesthesia.
  • Existing rules like the 3-3-2, 3-3-1, and 3-3 rules aim to assess airway difficulty preoperatively.

Purpose of the Study:

  • To evaluate the predictive value of the 3-3 rule and the 3-3-1 rule for difficult airways.
  • To compare the efficacy of the 3-3-2, 3-3-1, and 3-3 rules in predicting difficult laryngoscopy and intubation.

Main Methods:

  • An observational study was conducted over six months involving adult patients undergoing general anesthesia.
  • Preoperative patient characteristics, difficult airway assessments (including 3-3-2, 3-3-1, and 3-3 rules), and airway outcomes were recorded.
  • The 3-3-1 rule was specifically defined by interincisor distance, hyoid-mental distance, and hyoid-thyroid cartilage distance.

Main Results:

  • Out of 732 patients, 9.2% experienced difficult laryngoscopy (DL) and 3.4% had difficult intubation (DI).
  • The 3-3 rule (AUC 0.709) and 3-3-2 rule (AUC 0.702) showed similar, superior performance in predicting DL compared to the 3-3-1 rule (AUC 0.631).
  • For predicting DI, the 3-3-2 rule (AUC 0.830) and 3-3 rule (AUC 0.822) outperformed the 3-3-1 rule (AUC 0.725).

Conclusions:

  • The 3-3 rule and 3-3-2 rule demonstrate comparable efficacy in predicting difficult airways.
  • A hyoid-thyroid cartilage distance of less than two or one finger is not a significant predictor of difficult vocalization or intubation.