Inclusion Criteria:  Patients with age of 7 to 17 years-old who require a CT scan with IV contrast Require CT scan with IV contrast  Exclusion Criteria:  History of seizures Cardiovascular disease Presenting as a trauma a history of anaphylaxis to lidocaine children/adolescents with underlying neurodevelopmental conditions which would interfere with their ability to respond to pre and post IV contrast pain assessments.