[Osteoporosis in tunisian major beta thalassemic patients a study of 64 pediatric cases]

ABSTRACT

Osteoporosis has been described extensively in adult thalassemics. Fewer studies have been reported in thalassemic children. Study the frequency and outcome of osteoporosis in Tunisian major beta thalassemic children and to identify principal clinical risk factors and biological characteristics of its occurrence. It's a prospective study enrolled between 1 January and 31 December 2008. 64 thalassemic major patients were evaluated. The study of bone mineral density was provided by X-ray photon. Osteoporosis was defined by Z score beta -2SD at lumbar [L1-L4] sites. 30 of patients studied [46.87 per cent] had a Z score beta 2-SD. Compared with non-osteoporotic patients we have identified as risk factors the age of the patient [p = 0.001]. The number of transfusion [p = 0.002] and the increased of the annual consumption of blood [p = 0.02]. We found a larger number of growth retardation [p =0.004]. Iron overload was greater in the group of osteoporotic patients [p = 0.04]. The sex, age at diagnosis, the average of hemoglobin, the status of viral hepatitis B and C, the incidence of allo or auto-immunization, and thyroid status seem to have no influence the occurrence of osteoporosis in our study. The onset of osteoporosis is associated directly to higher transfusion requirements and age > 12 years