Detection of early renal osteodystrophy

Area of Science:

• Pediatric Nephrology
• Endocrinology
• Skeletal Biology

Background:

• Chronic kidney disease (CKD) can lead to renal osteodystrophy.
• Early detection of bone disease in children with moderate renal impairment is crucial.
• Histomorphometry is invasive, necessitating simpler, less invasive markers.

Purpose of the Study:

• To identify early, less invasive markers of bone disease in children with moderate renal impairment.
• To assess the utility of serum biochemistry and skeletal surveys compared to bone histology.
• To investigate the prevalence and type of renal osteodystrophy in this pediatric cohort.

Main Methods:

• Quantitative bone histology, serum biochemistry (including PTH and alkaline phosphatase bone isoenzyme), and skeletal surveys were performed.
• 21 children aged 6-18 years with moderate renal impairment (GFR 20-50 ml/min/1.73 m2) were studied.
• Bone biopsies were analyzed for histological abnormalities.

Main Results:

• 90% of bone biopsies showed abnormal histology.
• Elevated parathyroid hormone (PTH) levels were observed in all patients.
• Alkaline phosphatase bone isoenzyme was elevated in 95% of patients.
• X-rays were insensitive, detecting mild hyperparathyroidism in only 14.3% of patients.

Conclusions:

• Elevated PTH levels likely indicate true hyperparathyroidism preceding histological changes in chronic renal failure.
• Serum biochemistry, particularly PTH, may serve as an early marker for renal osteodystrophy.
• Prophylactic treatment for renal osteodystrophy may be warranted in children with moderate renal impairment based on elevated PTH levels.