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Comparative study between intact PTH and fragments of PTH in patients on hemodialysis and CAPD

M Martinez1, M Ausejo, J L Miguel

  • 1Biochemistry and Nephrology Service, Hospital La Paz Madrid, Spain.

Peritoneal Dialysis International : Journal of the International Society for Peritoneal Dialysis
|January 1, 1991
PubMed

Insights

Continuous ambulatory peritoneal dialysis (CAPD) may alter parathyroid hormone (PTH) levels, specifically mid-molecule PTH (MM-PTH), due to peritoneal losses. Hemodialysis (HD) patients showed higher MM-PTH than CAPD patients.

Area of Science:

  • Nephrology
  • Endocrinology
  • Biochemistry

Background:

  • Secondary hyperparathyroidism is common in patients with chronic kidney disease.
  • Different dialysis modalities may impact parathyroid hormone (PTH) metabolism and clearance.
  • Understanding PTH fragment levels is crucial for managing mineral and bone disorders in dialysis patients.

Purpose of the Study:

  • To compare serum parathyroid hormone (PTH) levels, including mid-molecule (MM-PTH) and intact PTH (Intact PTH), between patients on hemodialysis (HD) and continuous ambulatory peritoneal dialysis (CAPD).
  • To investigate the relationship between different PTH fragments and dialysis modality.
  • To assess the potential impact of peritoneal losses on PTH levels in CAPD patients.

Main Methods:

  • Serum calcium, phosphorous, and PTH levels were measured in 29 HD and 29 CAPD patients.
  • PTH levels were determined using four different assays, differentiating between mid-molecule (MM-PTH) and intact PTH (Intact PTH).
  • Ratios of PTH fragments (MM-PTH/Intact PTH and C-PTH/Intact PTH) were calculated and compared between groups.

Main Results:

  • Serum calcium and phosphorous levels were similar in both HD and CAPD groups.
  • MM-PTH levels were significantly higher in HD patients compared to CAPD patients (p < 0.001).
  • The ratio of MM-PTH/Intact PTH was higher in HD patients (p < 0.01), suggesting altered PTH metabolism or clearance.
  • In patients with similar C-PTH, CAPD patients had higher Intact PTH levels (p < 0.01).
  • The ratio C-PTH/Intact PTH was significantly higher in HD patients (p < 0.001).
  • The Peritoneal Saturation Index (PSI) of MM-PTH in CAPD patients was 23.4 +/- 12%.

Conclusions:

  • CAPD may lead to peritoneal losses of PTH fragments, potentially altering serum levels of MM-PTH and Intact PTH.
  • Differences in PTH fragment ratios between HD and CAPD suggest distinct impacts of these modalities on PTH metabolism.
  • Further research is needed to elucidate the clinical significance of these findings in managing mineral and bone disease in dialysis patients.

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