Prediction of difficult laryngoscopy using spirometry: a pilot study

Area of Science:

• Anesthesiology
• Respiratory Physiology

Background:

• Predicting difficult laryngoscopy is crucial for anesthetic safety.
• Conventional airway assessment techniques have limitations in accuracy.
• Spirometry offers objective physiological measurements.

Purpose of the Study:

• To evaluate spirometry's efficacy in predicting difficult laryngoscopy.
• To compare spirometry with traditional airway assessment methods.
• To identify significant spirometry parameters for difficult laryngoscopy prediction.

Main Methods:

• Pilot study involving 202 adult patients undergoing elective surgery.
• Preoperative spirometry for lung capacity measurements.
• Standard airway assessments (Mallampati, thyromental distance, etc.) and Cormack-Lehane grading during intubation.
• Statistical analysis including Spearman's correlation and multivariate regression.

Main Results:

• Thyromental distance correlated with forced inspiratory vital capacity (ρ=0.420, P<0.001).
• Forced inspiratory vital capacity was a significant predictor of difficult laryngoscopy (β=-2.050, P=0.022).
• Forced inspiratory vital capacity demonstrated an AUC of 0.754 for predicting difficult laryngoscopy.

Conclusions:

• Forced inspiratory vital capacity is closely associated with difficult laryngoscopy prediction.
• Spirometry measurements may serve as a valuable tool in preoperative airway assessment.
• Further research is warranted to integrate spirometry into routine anesthetic practice.