Cardiopulmonary bypass is done with a machine that does the work of the heart and lungs
during open-heart surgery. This study is to determine if intravenous (i.v.)
phenoxybenzamine is safe. This drug lowers the blood pressure, making it easier for the
cardiopulmonary bypass machine to deliver blood and oxygen to all of the organs and tissues.
- 0-18 years of age
- weight of less than or equal to 20 kilograms
- Parental refusal to give informed consent