Statistical test were performed using GraphPad Software, Inc., San Diego, United States and results are expressed as absolute values or mean ± standard deviation SD (SEM). Statistical analysis between the groups were carried out using analysis of variance (ANOVA) for age, BMI, time since premedication T1, time since NPO and T2 , pH and volume. Chi square test was applied for sex, ASA physical status, Hay's test and risk of aspiration according to criteria defined (pH ≤ 2.5 and volume ≥ 0.4ml/kg or 25 ml. Post hoc tests with Bonferrni correction applied where p-value significant(p <0,05). A p-value of less than 0.05 was considered statistically significant. Power analysis revealed that the sample size (n= 30) in each group was of the study was sufficient to detect a difference of 0.7 among the groups in gastric pH and volume at a significant level of 0.05 (=α 0 with a power of 0.85.