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Secondary hyperparathyroidism and glucose intolerance in children with uremia
Insights
Correcting secondary hyperparathyroidism in children with chronic renal failure (CRF) improved glucose metabolism and insulin secretion. This study highlights the link between phosphate levels and glucose tolerance in pediatric kidney disease.
Area of Science:
- Pediatric Nephrology
- Endocrinology
- Metabolic Research
Background:
- Secondary hyperparathyroidism (HPD) is common in children with chronic renal failure (CRF).
- Phosphate retention significantly impacts metabolic disturbances in CRF.
- The relationship between HPD and glucose metabolism in pediatric CRF requires further elucidation.
Purpose of the Study:
- To investigate the effect of correcting secondary HPD on glucose metabolism in children with CRF.
- To assess changes in glucose metabolic rate, insulin response, and insulin sensitivity.
- To explore the correlation between metabolic changes and HPD correction.
Main Methods:
- Glucose clamp technique was employed in 8 children with CRF (pubertal and prepubertal).
- Measurements were taken before and after treatment for secondary HPD (phosphate binders and dietary restriction).
- A control group of 5 uremic children without HPD was also studied.
Main Results:
- Glucose metabolic rate (M) increased by 34% and insulin response (I) by 32% after HPD correction.
- Insulin sensitivity (M/I) remained unchanged, indicating persistent insulin resistance.
- Patients showed improved glucose tolerance (normal M) and increased insulin secretion (normal I) post-treatment.
- A strong correlation was observed between changes in M and I across all patients.
Conclusions:
- Correction of secondary hyperparathyroidism in pediatric CRF improves glucose intolerance.
- Phosphate retention contributes to impaired glucose metabolism and reduced insulin secretion.
- Treatment strategies targeting phosphate control are crucial for managing metabolic complications in pediatric CRF.
Abstract:
Glucose metabolism was studied using the glucose clamp technique in 8 children with CRF (4 pubertal and 4 prepubertal) before and after correction of secondary hyperparathyroidism (HPD) by a regime of phosphate binders and dietary phosphate restriction. Glucose metabolic rate (M) increased by 34%, insulin response (I) increased by 32%, and insulin sensitivity (M/I) did not change. Compared to corresponding normal values, these patients were glucose-intolerant (low M) before treatment and became glucose-tolerant after treatment (normal M). They were insulin-resistant (low M/I) before treatment and remained so after treatment. The 5 uremic children without secondary HPD were treated with the same regime to prevent the secondary HPD. Their M, I, and M/I did not change after treatment. The change in I correlated closely with the change in M in all 13 patients. One pubertal patient with uremia was studied on three occasions. Initially, without secondary HPD, he had a normal M and a low M/I. When he developed secondary HPD, M decreased by 39%, I decreased by 37%, and M/I did not change. Treatment of his secondary HPD restored M and I values back to initial levels, and M/I again did not change. Treatment of secondary HPD by correction of phosphate retention led to an improvement of glucose intolerance with an increase in insulin secretion.