Statistical Methods
The chi square test was used to determine if significant differences existed in the proportion of categorical variables between groups receiving and not receiving intravenous contrast and between categorical variables within these groups. Student’s “t” test for unpaired data was used to compare mean values for continuous variables between the group that received IV contrast and the group that did not receive intravenous contrast. LV regional wall motion was assessed by 2 investigators who were experienced echocardiographers (CC and MA).
Alpert
Differences were resolved by consensus. A p value < 0.05 was required for statistical significance.