A systematic review of the prevalence and determinants of nonadherence to phosphate binding medication in patients with end-stage renal disease

Christina Karamanidou, Jane Clatworthy, John Weinman, Rob Horne, Christina Karamanidou, Jane Clatworthy, John Weinman, Rob Horne

Abstract

Background: Cardiovascular events are the leading cause of death in end stage renal disease (ESRD). Adherence to phosphate binding medication plays a vital role in reducing serum phosphorus and associated cardiovascular risk. This poses a challenge for patients as the regimen is often complex and there may be no noticeable impact of adherence on symptoms. There is a need to establish the level of nonadherence to phosphate binding medication in renal dialysis patients and identify the factors associated with it.

Methods: The online databases PsycINFO, Medline, Embase and CINAHL were searched for quantitative studies exploring predictors of nonadherence to phosphate binding medication in ESRD. Rates and predictors of nonadherence were extracted from the papers.

Results: Thirty four studies met the inclusion criteria. There was wide variation in reported rates of non-adherence (22-74% patients nonadherent, mean 51%). This can be partially attributed to differences in the way adherence has been defined and measured. Demographic and clinical predictors of nonadherence were most frequently assessed but only younger age was consistently associated with nonadherence. In contrast psychosocial variables (e.g. patients' beliefs about medication, social support, personality characteristics) were less frequently assessed but were more likely to be associated with nonadherence.

Conclusion: Nonadherence to phosphate binding medication appears to be prevalent in ESRD. Several potentially modifiable psychosocial factors were identified as predictors of nonadherence. There is a need for further, high-quality research to explore these factors in more detail, with the aim of informing the design of an intervention to facilitate adherence.

Figures

Figure 1
Figure 1
Demographic predictors of nonadherence to phosphate binding medication assessed by two or more studies.
Figure 2
Figure 2
Clinical predictors of nonadherence to phosphate binding medication assessed by two or more studies.
Figure 3
Figure 3
Psychosocial predictors of nonadherence to phosphate binding medication assessed by two or more studies.

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