Associations Between Serum Sodium Concentration and Bone Health Measures in Individuals Who Use Antiepileptic Drugs : A Pilot Study

Journal article


Park, Yeung-Ae, Subasinghe, Asvini, Ahmad, Baemisla Shiek, Gorelik, Alex, Garland, Suzanne, Clifford, Vanessa, Chiang, Cherie, Robinson, Heather and Wark, John. (2020). Associations Between Serum Sodium Concentration and Bone Health Measures in Individuals Who Use Antiepileptic Drugs : A Pilot Study. Journal of Clinical Densitometry. 23(3), pp. 364-372. https://doi.org/10.1016/j.jocd.2019.03.007
AuthorsPark, Yeung-Ae, Subasinghe, Asvini, Ahmad, Baemisla Shiek, Gorelik, Alex, Garland, Suzanne, Clifford, Vanessa, Chiang, Cherie, Robinson, Heather and Wark, John
Abstract

Hyponatraemia, defined as a serum sodium concentration ([Na+]) below 135 mmol/L, is the most common electrolyte disturbance observed in clinical practice (1). Hyponatraemia is associated with increased risk of osteoporosis (2,3), fractures (4,5), fractures independent of osteoporosis (3,5), and falls (4).

One of the common medication classes that cause hyponatraemia is antiepileptic drugs (AEDs), which are often used lifelong in patients with epilepsy, and increasingly in other conditions. AEDs can be classified as hepatic CYP450 enzyme-inducing AEDs (EIAEDs) or non-enzyme-inducing AEDs (NEIAEDs). Certain AEDs, such as carbamazepine and oxcarbazepine, demonstrate stronger associations with hyponatraemia than other AEDs (6). Whilst inducing hyponatraemia, AEDs are also independently associated with increased risk of osteoporosis and fracture (7). However, the underlying mechanisms by which AEDs adversely affect the risk of fragility fracture, and also cause hyponatraemia remain uncertain and likely are multifactorial.

A potential association between serum sodium concentration and the risk of fragility fracture in AED users appears not to have been explored previously and could help explain how AEDs are associated with impaired bone health. In this pilot study, we investigated the associations between the risk of fragility fracture (indicated by areal BMD (aBMD), fracture history, and falls history), and serum sodium concentrations in AED users. We hypothesised that AED use is associated with hyponatraemia, which is also associated with low aBMD and an increase in reported history of fractures and falls.

Materials and Methods: This was a retrospective study including patients with epilepsy from 3 studies approved by the Human Research Ethics Committee (HREC) at Melbourne Health, Victoria, Australia. All participants provided written consent to participate in the studies.

KeywordsAntiepileptic drugs; bone mineral density; epilepsy; fracture; hyponatraemia
Year01 Jan 2020
JournalJournal of Clinical Densitometry
Journal citation23 (3), pp. 364-372
PublisherElsevier BV
ISSN1094-6950
Digital Object Identifier (DOI)https://doi.org/10.1016/j.jocd.2019.03.007
PubMed ID31036448
Web address (URL)https://www.sciencedirect.com/science/article/pii/S1094695019300046
Open accessPublished as non-open access
Research or scholarlyResearch
Page range364-372
Publisher's version
License
All rights reserved
File Access Level
Controlled
Output statusPublished
Publication dates
Online23 Mar 2019
Publication process dates
Completed14 Sep 2020
Deposited04 Jan 2023
Place of publicationUnited States
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