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Rectal Organoid Morphology Analysis (ROMA): A Diagnostic Assay in Cystic Fibrosis
Published on: June 10, 2022
Bone status in cystic fibrosis
1The Cystic Fibrosis Unit, Royal Manchester Children's Hospital, Hospital Road, Manchester M27 4HA, UK.
Insights
Children with cystic fibrosis (CF) show normal bone mineral density overall, but reduced bone mineral apparent density (BMAD) at the lumbar spine, indicating potential cortical thinning. This suggests bone health monitoring is crucial even in mild CF cases.
Area of Science:
- Pediatric Endocrinology
- Bone Metabolism
- Cystic Fibrosis Research
Background:
- Cystic Fibrosis (CF) is a genetic disorder affecting multiple organs, including bones.
- Bone mineral status in children with CF requires further investigation, particularly in those with milder disease phenotypes.
Purpose of the Study:
- To assess the bone mineral status in children diagnosed with cystic fibrosis.
- To compare bone parameters between CF patients and age- and sex-matched healthy controls.
Main Methods:
- Dual-energy X-ray absorptiometry (DXA) was used to measure bone mineral content (BMC), bone area (BA), and areal bone mineral density (BMD).
- Quantitative computed tomography (QCT) assessed vertebral trabecular bone mineral density (vTBMD), and quantitative ultrasound (QUS) measured calcaneal broadband ultrasound attenuation (BUA).
- Bone mineral apparent density (BMAD) was calculated to assess volumetric density, and disease severity was evaluated using the Shwachman-Kulczycki (SK) score.
Main Results:
- No significant differences were observed in BUA, whole body/regional BA, adjusted BMC, or areal BMD between CF children and controls.
- CF patients exhibited reduced lumbar spine bone mineral apparent density (BMAD) compared to controls.
- Vertebral trabecular bone mineral density (vTBMD) standard deviation scores were significantly higher in CF patients, despite a relatively mild disease severity (median SK score 81).
Conclusions:
- The findings suggest potential reductions in vertebral cortical thickness or density in CF subjects, indicated by normal vertebral BMC but decreased BMAD.
- Overall bone mineral status in children with mild CF is comparable to size-matched controls.
- These results highlight the importance of evaluating volumetric bone density measures in pediatric CF populations.
Aim:
To investigate bone mineral status of children with cystic fibrosis (CF).
Methods:
In 29 children with CF and 49 matched controls, bone mineral content (BMC), projected bone area (BA), and areal bone mineral density (BMD) of the whole body, total hip, and lumbar spine (L1-L4) were measured using dual energy x ray absorptiometry. The BMC values at each site were adjusted for BA, height, and weight. At the lumbar spine, the bone mineral apparent density (BMAD) was calculated by dividing the BMC by the estimated volume, derived from BA. Vertebral (T12-L3) trabecular bone mineral density (vTBMD) was measured using quantitative computed tomography in children with CF. Calcaneal broadband ultrasound attenuation (BUA) was measured in CF patients and controls using quantitative ultrasound. The disease severity of CF children was evaluated by the Shwachman-Kulczycki (SK) score.
Results:
The mean BUA, whole body and regional BA, adjusted BMC, and areal BMD of children with CF were not different from those of controls. The mean BMAD of the lumbar spine was reduced in CF patients compared with controls, whereas the mean vTBMD standard deviation scores were significantly higher in CF patients. The median SK score of the CF group was 81 (range 42-100), indicating that as a group our CF patient population had relatively mild disease.
Conclusion:
The normal vertebral BMC, decreased BMAD, and higher vTBMD suggests that the vertebral cortical thickness or density might be reduced in CF subjects. The overall bone mineral status of CF children with relatively mild disease was not different from size matched controls.
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