Factors Influencing Time Of Intubation With A Light-wand Device

Objective: We want to evaluate the correlation between accepted screening tests for difficult tracheal intubation and ease of intubation with a light-wand blind technique. Measurements 125 ASA physical status I～III adult pations between 17 and 70 years of age, requiring intubation for elective surgery were randomized enrolled in the study. Calculated and recorded age, sexual distinction, weight, height, body mass index, mouth opening, thiopental distance, Mallampati class (MC), Cormack and Lehane scoring(or laryngoscope grades, LG)for each patient before intubation. Venipuncture with venous cannula, preoxygenation with 100 % oxygen for 3 minutes after arrival at the operation room. General anesthesia was induced with midazolam 0.1mg/kg, fentanyl 4μg/kg , vecuronium0.1mg/kg . After oxygenation with mask ventilation, the wand and tube complex were bent at the distal end of the wand to form a tight 90-degree angle. Endotracheal tubes with a 7.0 mm / 7.5 mm internal diameter (ID) were used for women/men. The duration of the light-wand intubation attempt was recorded as the interval from the time the device touched the patient's tooth to the time when the tube into the tracheal. Then to evaluate the correlation between accepted screening tests for difficult tracheal intubation and ease of intubation with a light-wand blind technique. And evaluate intubation times, intubation attempt, intubation success rates. Also evaluate some important variable and the correlation between them. Results MC(β=0.441, t =7.339, P =0.000) and LG (β=0.413, t =6.988, P =0.000) score are important to intubation times when using light-wand. Body mass index has correlation with MC and LG score, thiopental distance has correlation with LG score (r =0.364,0.345,-0.315,respectably, P =0.000). Overall tracheal intubation success rates with the light-wand blind technique was higher (96.7%), overall tracheal intubation success times were 10.62±5.997 seconds (Mean±SD). Conclusion So it is sure that blind oral tracheal intubation using the light-wand is a simple, rapid, and effective modality. In regard to unanticipated difficult tracheal intubation light-wand has some important effect. Mallampati class and Cormack and Lehane scoring are two important factors that interfere with the intubation using light-wand. And body mass index, mouth opening, thiopental distance maybe interfered the intubation when use light-wand.