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.