Detection of Ultrasound Contrast Signals in the Cerebral Circulation

Inclusion Criteria

• •male or female age \>19 years of age
• •scheduled for a stress echocardiogram
• •negative urine pregnancy test within two hours of ultrasound contrast administration required for females of childbearing age unless post-menopausal or with evidence of surgical sterilization
• •be conscious and coherent, and able to communicate effectively with trial personnel