Comparison of hemodynamic responses to orotracheal intubation with Shikani optical stylet through the left molar approach and Macintosh direct laryngoscope

Objective To compare the hemodynamic responses to orotracheal intubation using Shikani optical stylet(SOS)and a Macintosh direct laryngoscope(MDLS).Methods Forty patients scheduled for selective surgery under general anesthesia were randomly allocated to either group S or group M. Invasive blood pressure and HR were recorded before anesthesia induction(T0),after induction(T1),immediately after intubation(T2) and at 1 min(T3),3 min(T4),5 min(T5) after intubation. The intubation duration was recorded,and rate-pressure product(RPP)was calculated.Results After induction,BP and RPP in both groups decreased significantly (P0.05). Compared with T1,BP and RPP at T2,T3 and HR at T2-T5 increased significantly (P0.05). At T2,SBP in group M was higher than that in group S(P0.05).Except for this,no significant difference was detected between two groups. In group M,the time required for the maximum values of HR was significantly delayed compared with that in group S. The incidence of SBP more than 30% of the baseline and RPP more than 22 000 in two groups was not significantly different. There was no significant difference in intubation duration.Conclusion Orotracheal intubation with SOS via left molar approach can be performed effectively less with less hemodynamic response.