Effect of nitroglycerine versus phentolamine on the scores of psychometric tests
Visual Retention, groups,*P-value ≤
The scores of PALT significantly declined one week following surgery in both Nitroglycerine and Phentolamine groups (P-value = 0.034, 0.018 respectively). Also, the scores of BVRT significantly declined one week following surgery in both Nitroglycerine and Phentolamine groups (P-value = 0.013, 0.025 respectively). There was no statistically significant difference between Nitroglycerine and Phentolamine groups in the postoperative decline in either PALT or BVRT (P-value = 0.342, 0.662 respectively) (Table 
Pre and post-operative psychometric tests in patients in Nitroglycerine and Phentolamine groupsValues are expressed as median (Q1-Q3)PALT: Paired Associate Learning Test, BVRT: Benton Visual Retention TestWilcoxon test was used for comparison between pre and post-operative quantitative variables, Mixed ANOVA test was used for comparing pre and post-operative quantitative variables in the two groups,*P-value ≤ 0.05 is considered significantThere were no statistically significant differences between Nitroglycerine and Phentolamine groups in the percent of change in either PALT or BVRT (P-value = 0.689, 0.675 respectively) (Table 
Percent of change in PALT and BVRT in both Nitroglycerine and Phentolamine groupsPercent of change in PALT[Median (IQR)]Values are expressed as median (Q1-Q3)PALT: Paired Associate Learning Test, BVRT: Benton Visual Retention TestMann-Whitney test was used for comparison between Nitroglycerine and Phentolamine groupsP-value > 0.05 is considered in-significant