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. 2024 Aug 1;65(8):421-429.
doi: 10.4103/singaporemedj.SMJ-2021-391. Epub 2022 Nov 2.

Prevalence and outcomes associated with hypocalcaemia and hypercalcaemia among pre-dialysis chronic kidney disease patients with mineral and bone disorder

Mei Hui Amanda Yong  1 , Jun Jie Benjamin Seng  2 , Ying Lin Cheryl Tan  1 , Jiunn Wong  3 , Priscilla How  4
Affiliations

Prevalence and outcomes associated with hypocalcaemia and hypercalcaemia among pre-dialysis chronic kidney disease patients with mineral and bone disorder

Mei Hui Amanda Yong et al. Singapore Med J. .

Abstract

Introduction: Chronic kidney disease-mineral and bone disease (CKD-MBD) is a complication of chronic kidney disease (CKD) involving derangements in serum calcium and phosphate. This study aims to evaluate hypo- and hypercalcaemia and their associated outcomes among pre-dialysis CKD patients.

Methods: A retrospective cohort study was performed and included all adult CKD stage 4-stage 5 patients who were on treatment for CKD-MBD between 2016 and 2017. Each patient was followed up for 3 years. Hypo- and hypercalcaemia were defined as serum corrected calcium (Ca 2+ ) <2.10 and >2.46 mmol/L, respectively. Outcomes evaluated included all-cause mortality and cardiovascular events. Multivariate Cox regression analysis was done to evaluate the association of hypocalcaemia and/or hypercalcaemia with the clinical outcomes. Severity of hypocalcaemia episode was classified as 'mild' (Ca 2+ : between 1.90 and 2.10 mmol/L) and 'severe' (Ca 2+ : <1.90 mmol/L). Severity of hypercalcaemia was classified as 'mild' (Ca 2+ : between 2.47 and 3.00 mmol/L), moderate (Ca 2+ : between 3.01 and 3.50 mmol/L) and severe (Ca 2+ : >3.50 mmol/L).

Results: Of the 400 patients, 169 (42.2%) and 94 (23.5%) patients experienced hypocalcaemia and hypercalcaemia, respectively. Severe hypocalcaemia was more prevalent in CKD stage 5 compared to CKD stage 4 (96 [40.5%] vs. 36 [25.9%], P = 0.004). Results from multivariate analyses after adjustment showed that hypocalcaemia and/or hypercalcaemia were not associated with all-cause mortality ( P > 0.05) or the occurrence of cardiovascular events ( P > 0.05).

Conclusion: Hypocalcaemia and hypercalcaemia episodes were prevalent among pre-dialysis CKD patients. Studies with longer follow-up durations are required to assess the effects of calcium derangements on clinical outcomes.

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Conflict of interest statement

There are no conflicts of interest.

Figures

Figure 1
Figure 1
Flowchart of patients included in the study. eGFR: estimated glomerular filtration rate, SGH: Singapore General Hospital.
Figure 2
Figure 2
Kaplan–Meier curve for survival probability stratified by presence of hypocalcaemia and/or hypercalcaemia.
Figure 3
Figure 3
Cox regression model for incident cardiovascular event.
See this image and copyright information in PMC

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