The goal of this clinical research study is to learn if the drug nesiritide (Natrecor) is
effective in lowering the pressure in your lungs.
The primary objective of this study is to establish that Nesiritide (Natrecor) is effective
in reducing pulmonary hypertension (PHTN) acutely as measured by a 20% reduction in the mean
pulmonary arterial (PA) pressure. The secondary objectives will include: improvement in
pulmonary vascular resistance (PVR), patient symptoms, exercise tolerance, frequency of
toxicity, and surgeon's willingness to proceed with operation.