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Deferoxamine-induced platyspondyly in hypertransfused thalassemic patients
T L Levin1, S Sheth, W E Berdon
1Department of Radiology, Columbia-Presbyterian Medical Center, Babies & Children's Hospital, 3959 Broadway, BHN 3-318, New York, NY 10032, USA.
Insights
Deferoxamine chelation therapy can cause skeletal abnormalities in thalassemia patients, especially when initiated in infancy. These bone changes, including vertebral flattening, resemble Scheuermann disease.
Area of Science:
- Hematology
- Pediatric Endocrinology
- Radiology
Background:
- Deferoxamine is a critical iron chelation therapy for hypertransfused thalassemia patients.
- Skeletal growth abnormalities have been suspected with long-term deferoxamine use.
Observation:
- Radiographic review of seven hypertransfused thalassemia patients.
- Serial spinal imaging in two patients treated from infancy was analyzed.
Findings:
- Patients receiving early, high-dose deferoxamine exhibited rachitic-like changes in long bones and vertebral body flattening.
- Vertebral bodies progressed from normal to bulbous, then flattened, resembling a milder Scheuermann disease.
- Bone changes were distinct from, but reminiscent of, post-radiation effects.
Implications:
- Early and high-dose deferoxamine therapy may pose a risk for skeletal development in pediatric patients.
- Monitoring skeletal growth is crucial for thalassemia patients undergoing long-term chelation.
- Further research into optimizing chelation protocols to mitigate bone toxicity is warranted.
Abstract:
Deferoxamine chelation therapy (widely used to reduce iron overload in hypertransfused thalassemic patients) has been implicated in causing skeletal growth abnormalities (rachitic-like changes in the long bones and vertebral body flattening), particularly when used in early infancy and at high dose levels. Radiographs of seven hypertransfused and well-chelated patients with thalassemia were reviewed. For two patients, serial films of the spine from the early 1970s to the present revealed a sequence of changes in the vertebral bodies, beginning with normal bodies that became bulbous and subsequently flattened. These two patients had begun deferoxamine chelation therapy early in infancy. The bone changes, though slightly reminiscent of post-radiation changes, are milder and result in a final Scheuermann-like picture.