During the 72 hours of intravenous (IV) nesiritide infusion, if the systolic blood pressure decreases to less than 90 mmHg for 5 minutes, the coronary care unit (CCU) sx will be notified and if the systolic blood pressure has not increased to > or equal to 90 mmHg within 45 minutes, the nesiritide infusion will be stopped. All patients will receive other medical therapy as determined appropriate by the physician except for angiotensin converting enzyme inhibitor (ACEI), which will be started 24 hours after IV nesiritide. Lisinopril will be started 24 hours after the start of IV nesiritide at an initial dose of 2.5 mg and to be titrated up by the participants' physician according to their clinical status. The window for the lisinopril doses would be +/- 1 hour.