We actually had to take Ginny downstairs to radiology for her ultrasound rather than them coming up here. The radiologist was able to identify Ginny's problem as hypertrophic pyloric stenosis (HPS). HPS is a narrowing of the opening that goes from the stomach to the intestine due to an enlargement of the muscle around it. This is a known, but not very common side effect of the drug PGE that she was given to keep her patent ductus arteriosis (PDA) open before her heart surgery.
Ginny will need surgery to repair her HPS in the next few days. The good news is that the surgery can be done laproscopically and we could be home (again) only a few days after the surgery.