Hemoglobin Barts Hydrops Fetalis
The most severe form of alpha-thalassemia and is almost always lethal, and characterized by fetal onset of generalized edema, pleural and pericardial effusions, and severe hypochromic anemia. It is caused by the presence of Hemoglobin Barts, a hemoglobin with four gamma chains, which has an extremely high affinity for oxygen, resulting in almost no oxygen delivery to the tissues