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Early diagnosis of juvenile renal osteodystrophy
Insights
Early diagnosis of renal osteodystrophy in children is crucial. Elevated parathyroid hormone (PTH) and abnormal bone biopsies indicate disease, even with normal blood tests and X-rays.
Area of Science:
- Pediatric Nephrology
- Bone Metabolism
- Chronic Kidney Disease
Background:
- Renal osteodystrophy is a significant complication in children with chronic renal failure.
- It is particularly severe in younger children with congenital kidney diseases.
- Advances in dialysis and transplantation highlight the need for early detection.
Purpose of the Study:
- To determine the earliest indicators of renal osteodystrophy in pediatric chronic renal failure.
- To correlate clinical, biochemical, and hormonal markers with bone histomorphometry.
- To identify "early" renal osteodystrophy before overt biochemical or radiographic changes.
Main Methods:
- Studied 29 children with chronic renal failure and varying degrees of kidney dysfunction.
- Assessed glomerular filtration rate (GFR), serum parathyroid hormone (PTH), and standard chemistry panels.
- Performed percutaneous transiliac bone biopsies for histomorphometric analysis.
Main Results:
- Reduced GFR (mean 35 ml/min/1.73 m2) observed in all patients.
- Elevated serum PTH found in all patients with GFR < 45 ml/min/1.73 m2.
- Abnormal bone histomorphometry correlated with elevated PTH; "early" renal osteodystrophy identified in 25% of patients.
- Poor correlation between serum chemistry/radiographs and bone histomorphometry.
- Histologic findings included osteomalacia, hyperparathyroidism, or mixed patterns.
Conclusions:
- Elevated PTH and abnormal bone histomorphometry are key indicators of renal osteodystrophy in children.
- "Early" renal osteodystrophy can be diagnosed using PTH levels and bone biopsies, preceding standard diagnostic markers.
- Clinical and biochemical assessments alone are insufficient for early diagnosis, underscoring the importance of bone biopsy in specific cases.
Abstract:
Renal osteodystrophy has assumed growing importance as a major and frequently disabling complication of chronic renal failure in children since the advent of successful hemodialysis and renal transplantation programs. The frequency and severity of renal osteodystrophy appears greatest in younger children with congenital diseases of the kidney and urinary tract, who experience long intervals of chronic renal failure prior to reaching end-stage. Twenty-nine children with varying degrees of chronic renal failure were studied to learn: (1) how early renal osteodystrophy can be diagnosed; and (2) how the various clinical, biochemical, and hormonal abnormalities correlate with abnormal bone histomorphometry as determined from percutaneous transilial bone biopsies. Results showed: (1) marked-to-moderate reductions in GFR (mean = 35 ml/minute/1.73 m2; range 11 to 65 ml/minute/1.73 m2); (2) elevations of serum PTH concentrations in all patients with a GFR < 45 ml/minute/1.73 m2; (3) abnormal bone histomorphometry in all patients with elevated PTH concentrations; (4) "early" renal osteodystrophy (elevated PTH concentrations and abnormal bone histomorphometry but normal serum chemistry values and radiographs) in one quarter of the patients; (5) poor correlations of serum chemistry values and radiographs with bone histomorphometry; and (6) a wide range of histologic abnormalities including predominant osteomalacia (n = 7), predominant hyperparathyroidism (n = 6), or a mixed picture (n = 11).