HLHS was first successfully treated in the mid-1980's by Dr. William Norwood, a pediatric heart surgeon working out of Philadelphia Childrens Hospital under Dr. Aldo Castaneda.  Until that time, HLHS had been nearly 100% fatal.  Success rates were low in the beginning, but increasingly more of the infants were given a second chance at life through the developing palliative surgeries.  Since the procedures were developed so recently, the oldest patients who have undergone surgical treatment are just reaching adulthood.  Baby Fae, the little girl who received the baboon heart transplant in 1984, is probably the most prominent case of HLHS.