# Significance of Serum Magnesium in Parathyroid Hormone Level in Patients with Chronic Kidney Disease

## TL;DR

This study shows that serum magnesium and diabetes are linked to lower parathyroid hormone levels in patients with advanced kidney disease.

## Contribution

The study reveals a novel negative association between serum magnesium and parathyroid hormone in CKD5 patients.

## Key findings

- Ln_PTH levels were negatively associated with magnesium and calcium in peritoneal dialysis patients.
- Diabetic patients had lower Ln_PTH levels in both dialysis and non-dialysis groups.
- Age was negatively associated with Ln_PTH in non-dialysis patients.

## Abstract

In chronic kidney disease (CKD) patients, elevated parathyroid hormone (PTH) is linked to cardiovascular mortality and morbidity. Levels of PTH are influenced by serum phosphate (P) and calcium (Ca), but little is known about the impact of magnesium (Mg) on PTH. Hence, this study investigated the relationship between PTH and Mg in peritoneal dialysis (PD) patients and non-dialysis patients from three hospitals in China.

This cross-sectional study included 446 chronic kidney disease stage 5 (CKD5) patients from three hospitals in southern China. PTH was naturally transformed to Ln_PTH for analysis. The chi-square test, Pearson correlation analysis, hierarchical regression analysis, and t-test were used to explore the relationships between Ln_PTH and gender, diabetes history, Mg, P, Ca, albumin (Alb), red blood cells (RBC), hemoglobin (Hb), white blood cells (WBC), and platelet (Plt).

Patients with diabetes mellitus (DM) had lower levels of Ln_PTH in PD (P<0.05) and non-dialysis (P>0.05) patients. Ln_PTH levels were negatively associated with Mg and Ca but positively associated with P and Alb in PD patients (all P<0.05). Ln_PTH levels were negatively associated with age but positively associated with P in non-dialysis patients (all P<0.05).

This study demonstrates the negative effect of Mg and diabetes on Ln_PTH levels in CKD5 patients.