Hb F levels, longevity of homozygotes and clinical course of sickle cell anemia in Brazil.
A sample of 354 individuals with sickle cell anemia ascertained in the city of Rio de Janeiro was studied to investigate the relationships between Hb F level, morbidity, and mortality. The mean Hb F level was 6.41 +/- 5.21%. The relationship between age and the proportion of Hb F can be described as a quadratic polynomial distribution, the level falling from approximately 11% in the first year to 4% at 25 years and then rising proportionally after 30 years. The correlations between Hb F level and 140 variables, including hematological values, signs and symptoms of the disease, as well as therapeutic requirements, showed that the patients with high Hb F levels are less anemic and have a more benign course. Several significant correlations (between amount of Hb F and the following clinical signs: pallor of mucous membranes, jaundice, cholelithiasis, leg ulcers, bronchial asthma, increased pulmonary vascularity, left ventricular hypertrophy, and osteomyelitis) are being reported here for the first time.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000755:Anemia, Sickle Cell / Q000097:blood* / Q000235:genetics / Q000401:mortality; D001938:Brazil; D002648:Child; D002675:Child, Preschool; D005260:Female; D005319:Fetal Hemoglobin / Q000032:analysis*; D006720:Homozygote; D006801:Humans; D007223:Infant; D008136:Longevity; D008297:Male; D008875:Middle Aged
D005319:Fetal Hemoglobin