A Comparative Study of Ease of Insertion of Laryngeal Mask Airway with Propofol and Thiopentone with Lignocaine Spray

ABSTRACT

Introduction: Study was conducted to determine the conditionsfor insertion of LMA following induction of anaesthesia with(Propofol, 2 mg/kg) and (Thiopentone, 5 mg/kg, preceded by10%Lignocaine spray to the posterior oropharyngeal wall) byobserving six different parameters (gagging, laryngospasm,body movements, coughing, ease of insertion, jaw relaxation)and assessing all six parameters together with Lund andStovner gradingsystem. The hemodynamic parameters wererecorded during induction of anaesthesia and following LMAinsertion.Material and Methods: Patients were allocated randomlyinto two groups, (40 patients per group), Group A- Propofoland Group B- Thiopentone, preceded with 10%Lignocainespray.Results: In Group A significant decrease in HR (p<0.05),systolic BP (p<0.01), diastolic BP (p<0.01) and mean BP(p<0.01) was observed as compared to Group B. The overallassessment for the ease of insertion of LMA was 100%inGroup A and 97.5%in Group B which was statistically notsignificant (p=0.314). No significant difference was observedin gagging (p=0.152), laryngospasm (p=0.314), bodymovements (p=0.221), coughing (p=0.221), jaw relaxation(p=0.314) and the ease of insertion (p=0.314).Discussion: 10% Lignocaine spray suppresses upper airwayreflexes in Thiopentone group and facilitates LMA insertionwithout any adverse response.Conclusion: Thiopentone preceded with 10%Lignocainespray to the posterior oropharynx (Group B) provides almostequal conditions for LMA insertion as compared to Propofol(Group A) with better hemodynamic stability