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Up Front MattersBrief Reviews
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Understanding Medication Nonadherence after Kidney Transplant

Thomas E. Nevins, Peter W. Nickerson and Mary Amanda Dew
JASN August 2017, 28 (8) 2290-2301; DOI: https://doi.org/10.1681/ASN.2017020216
Thomas E. Nevins
*Department of Pediatrics, University of Minnesota, Minneapolis, Minnesota;
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Peter W. Nickerson
†Department of Medicine, University of Manitoba, Winnipeg, Manitoba, Canada; and
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Mary Amanda Dew
‡Department of Psychiatry, University of Pittsburgh School of Medicine and Medical Center, Pittsburgh, Pennsylvania
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Abstract

Alloimmunity remains a barrier to long-term graft survival that necessitates lifelong immunosuppressive therapy after renal transplant. Medication nonadherence has been increasingly recognized as a major impediment to achieving effective immunosuppression. Electronic medication monitoring further reveals that nonadherence manifests early after transplant, although the effect is delayed. The etiology of nonadherence is multifactorial, with the strongest risk factors including past nonadherence and being an adolescent or young adult. Other risk factors with smaller but consistently important effects include minority race/ethnicity, poor social supports, and poor perceived health. In children, risk factors related to parental and child psychologic and behavioral functioning and parental distress and burden are also important. Qualitative systematic reviews highlight the need to tailor interventions to each transplant recipient’s unique needs, motivations, and barriers rather than offer a one size fits all approach. To date, relatively few interventions have been studied, and most studies conducted were underpowered to allow definitive conclusions. If the kidney transplant community’s goal of “one transplant for life” is to become a reality, then solutions for medication nonadherence must be found and implemented.

  • renal transplantation
  • transplant outcomes
  • rejection

Presently, the first-year results of kidney transplantation are significantly better and early acute rejection rates are dramatically lower than only a few decades ago.1,2 These improvements primarily result from treatment protocols combining potent oral immunosuppressant medications.3 However, graft survival rates beyond the first year have not proportionately improved.2 Alloimmunity manifesting as late rejection, clinical and subclinical, primarily associated with donor-specific antibodies (DSAs) is now recognized as the dominant cause of late graft loss.4

The principal independent correlates of late rejection and de novo DSAs are class 2 HLA mismatching, younger age, and medication nonadherence (MNA).4,5 Indeed, a model has emerged that HLA mismatching, particularly class 2 mismatching, sets the stage for T cell–mediated rejection (TCMR) and/or de novo DSA formation.6 After a de novo DSA forms, in >50% of patients, it results in antibody-mediated rejection (ABMR) that smolders over time and eventually results in chronic ABMR reflected in the biopsy as transplant glomerulopathy.5 The interstitial fibrosis and tubular atrophy that are detected in late post-transplant biopsies for cause are correlated with early TCMR and MNA.5 The model suggests that alloimmune-mediated late graft loss ensues as a result of ongoing ABMR and/or TCMR, and both of these processes are accelerated in the presence of patient MNA or physician-guided immunosuppressive minimization.6 From this model, two major strategies emerge to improve long-term graft outcomes—class 2 HLA matching and early detection/reversal of patient MNA.

Unfortunately, MNA is a complex issue, and even physicians, experts who know the importance of a prescribed medication regimen, have personal difficulties with adherence. For example, in the Physicians’ Health Study, approximately one third of volunteering physicians showed significant MNA (by self-report) in a trial of once daily aspirin or placebo.7 As transplant recipients resume active (healthier) roles in their personal “real world,” disrupted daily schedules, postponed work, delayed travels, and laboratory and clinic visits as well as a host of new time constraints irregularly distort their daily routines. The goal of this review is to provide a summary of our current understanding of the factors associated with MNA, the strategies used to date to overcome MNA, and the effectiveness of these approaches.

Definition and Measurement of MNA

In the arena of clinical transplantation, patient adherence is a multilayered and dynamic clinical concept. It encompasses a spectrum of behaviors ranging from lifestyle changes to regular attendance at clinic and laboratory visits. However, medication adherence, with a focus on post-transplant immunosuppressive medications, refers very specifically to the patient following agreed on recommendations and instructions from health care professionals concerning the taking of these drugs. In this context, medication adherence may be seen as two linked activities, namely adherence and persistence. Adherence indicates that the medication is taken at the prescribed dosage and times, whereas persistence measures the duration and consistency of this specific adherent behavior.

Unfortunately, health care providers are very poor judges of patient adherence and even seem perhaps biased to believe their patients are more adherent than average.8 Because post-transplant adherence with immunosuppression is pivotal to the success of the transplant, two questions are logically asked: “when does MNA begin?” and “how much adherence is enough?” Although it is true that MNA may gradually appear later in a patient’s clinical course, electronic medication monitors have now clearly shown dramatic early immunosuppressive MNA in renal transplantation.9 Indeed, this pattern is not unique to transplantation; early nonadherence to a variety of medications is regularly observed in a number of other chronic conditions.10,11 Importantly, this general observation may permit earlier interventions to improve adherence and delay or avoid later adverse outcomes.

As for medication adherence adequacy, the focus has most frequently been on whether doses were taken rather than issues of timing and taking doses erratically. Indeed, research is required to clarify the effect of nonadherence to timing of immunosuppressive medication dosing. With respect to dose-taking adherence, an oft-used value, drawn from the BP literature, is “>80%,”12,13 but in transplantation, this metric is of little clinical relevance. Consider that any single percentage overlooks both the duration and pattern of the adherent behavior. For example, a patient prescribed an immunosuppressant drug twice daily should take 60 doses in 1 month. Thus, 80% adherence could be achieved by either randomly missing a single dose about three times a week or taking a drug holiday for the last 6 consecutive days of the month. Biologically, the consequences of these two patterns will likely be dramatically different. Moreover, while recognizing that each kidney donor-recipient pair differs immunologically, in missing definitive prospective data, for most patients with transplants, the 80% cut point is far too low: adherence rates of <95%–100% are associated with increased risk of acute rejection and graft loss.14

Because medication adherence is so important, how can it best be measured? Apart from parenteral medications administered in a clinic or directly observed therapy, any clinical measurements of medication adherence will have inherent limitations. Methods to assess medication adherence, including pill counts, questionnaires, patients’ diaries, and random measurements of blood drug concentrations, can overestimate adherence.15 Tracking an individual’s prescription refills or awaiting adverse events are, by nature, retrospective and indirect measures, and they limit the effectiveness of any proactive approach to improve adherence.16 Still, the absence of any measurable drug in a patient’s blood, failing to refill a prescription for an extended time, or openly admitting nonadherence to a health professional likely confirm MNA. Although convincing, such isolated clinical events are relatively uncommon.

An inexpensive measure of adherence is to simply ask the patient. Although self-report can overestimate adherence, positive responses to either of two questions have been shown to reliably identify likely MNA.17 (1) How often did you miss a dose of your immunosuppressive medication in the past 4 weeks? (2) Did you miss more than one consecutive dose of your immunosuppressive medication in the past 4 weeks? Clearly, such queries will miss patients unwilling to self-identify and those who cannot remember forgetting a dose. Nevertheless, any positive answers indicate some degree of MNA and provide the basis for immediate conversations about all medication-taking practices.

A slightly more expensive approach uses the coefficient of variation (CV) of a patient’s tacrolimus levels to suggest MNA. Often, nonadherent patients will be more careful with their medication dosing, even increasing their dose, at times of laboratory testing and clinic visits.18 Because the calculated CV should best reflect the patient’s steady state, nonroutine drug levels obtained for clinical reasons (intercurrent illness, dose changes, etc.) should be excluded from any CV calculation. With that caveat, in renal transplantation, elevated tacrolimus CVs have been associated with increased adverse events and accelerated biopsy-proven graft fibrosis.19–21

Since the introduction of electronic monitoring (EM) of medications in 1988, it has become increasingly widely accepted as providing the best estimate of adherence. This approach is occasionally flawed, because the event of opening the vial does not ensure that the patient then actually takes the medication. Nevertheless, the Food and Drug Administration recently endorsed “smart bottles” as an approach to improving drug development trials by confirming protocol fidelity.22 In situations where the drug regimen is complex and the drug’s therapeutic index is narrow (HIV infection and kidney transplantation), EM has been useful to quantify adherence and compile individual drug-dosing histories. In prospective studies of adult renal transplant recipients, such dosing histories have been directly associated with clinical outcomes, even showing a dose-response relationship between measured MNA and adverse events.23 In patients with kidney transplants followed for up to 4 years, EM has documented that MNA begins early in the post-transplant period and that the pattern regularly persists thereafter.14 Such studies also show a gradual erosion of medication adherence over time.

Risk Factors for MNA

Two literatures provide evidence on risk factors for immunosuppressant MNA after kidney transplantation: quantitative reports of empirical associations between putative risk factors and adherence outcomes and qualitative studies that ask patients directly what factors affect their adherence.

Quantitative Studies

The World Health Organization conceptualization of five categories of risk factors likely to be important for adherence to chronic disease treatment regimens24 provides a framework for considering risk factors examined in kidney recipients to date (Figure 1). Among adult recipients, there is at least some support for the role of variables in all five categories (examples are in Figure 1).16,25–29 Among the most consistently found and most potent risk factors is past MNA.16,25,30,31 A meta-analysis found that three factors—nonwhite ethnicity, poor social supports, and poor perceived health—increased patients’ risk for immunosuppressant MNA, but the effect of these factors, although consistent, is relatively small.32 Other factors emerging as important in recent studies include cognitive elements, such as forgetting; treatment-related features, such as regimen complexity; condition-related factors, such as receipt of a living donor transplant and perceiving one’s health to be better; and health care system factors, such as insurance coverage and copayments.25,26,30,33,34

Figure 1.
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Figure 1.

Major categories of risk factors for nonadherence in chronic disease based on reviews of the empirical literature (the work by Sabaté and World Health Organization24). For each of the five categories of risk factors identified, examples are provided to illustrate findings specific to studies of kidney transplant recipients.

Risk factors for nonadherence in pediatric kidney recipients have also received consideration, and among the strongest such factors is recipient age.30,35–37 Adolescents/young adults (i.e., age <25 years old) are at considerably greater risk for nonadherence to the medical regimen and medication taking in particular than either younger or older recipients. In pediatric recipients of kidneys and other types of organ transplants, there is also relatively consistent evidence that sociodemographic characteristics of the family (e.g., parental marriage not intact), family psychosocial characteristics (lower family cohesion/support and greater parental distress and burden), child psychosocial status (poorer behavioral functioning and greater psychologic distress), and health care system–related factors (receipt of public rather than private insurance) increase risk for medical regimen nonadherence.35,36 However, this literature is smaller than that available for adults, and studies have not always distinguished between risk factors specifically for immunosuppressant nonadherence as opposed to other areas of the regimen.

Qualitative Studies

A growing qualitative literature has focused on self-management issues in general and MNA more specifically after organ transplantation. Three recent systematic reviews summarized this evidence for adult kidney recipients38,39 and adolescent organ (including kidney) recipients.40 The strength of this literature is its emphasis on eliciting the experiences of transplant recipients in their own words (i.e., the perspective that the patients—rather than the researchers—are the real experts on what limits and promotes adherence).41 This approach has the potential to suggest possible risk factors for nonadherence that researchers may have overlooked or assessed inadequately.

Adult kidney recipients’ views about self-management issues and challenges in this literature seem to reflect five broad areas or themes38: (1) empowerment (difficulties and strategies for gaining a sense of control over the post-transplant medical regimen), (2) fear of consequences (e.g., fear of graft loss and medications’ adverse effects), (3) managing regimen demands (coping with forgetfulness, side effects, and lifestyle disruptions), (4) concerns about overmedicalizing life (feelings of fatigue at being a patient and feeling burned out at performing self-management tasks), and (5) social accountability and motivation (indebtedness to the donor and gratitude to the medical team). In adolescent organ recipients (kidney and/or other organs), similar concerns with respect to the medical regimen and medication adherence emerged, with an emphasis on moving from dependence on caregivers to assuming responsibility for self-management.39

Tong et al.40 focused more narrowly on medication taking after kidney transplantation in adults ages 18 years old and older. On the basis of their synthesis of the evidence, they judged that the themes that patients emphasized could be integrated to offer general perspectives on the factors contributing to patients’ degree of medication adherence. As shown in Figure 2, patients fall along a spectrum ranging from complete MNA (for a variety of reasons described by patients, some of which are shown in Figure 2) to partial adherence (in which patients may seek to change their dosing, miss doses, or take them at the wrong times) to complete adherence (motivated by factors, such as protecting the new organ, or because patients have developed their own systems and ways of relying on others’ help). In all three systematic reviews, the authors suggest that interventions to improve self-management or more specifically, adherence to the post-transplant medical regimen would have greater potential for success if they explicitly considered the themes reflected in patients’ comments. This would lead logically to the need to tailor interventions to each transplant recipient’s unique needs, motivations, and barriers rather than offer a one size fits all approach.

Figure 2.
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Figure 2.

Themes reflecting challenges and decisions about medication taking after kidney transplantation. Results from qualitative studies in adults are modified from Tong et al.40, with permission.

MNA Intervention Studies

Descriptive Information

Since 2000, 13 studies have evaluated interventions targeting immunosuppressant medication adherence after kidney transplantation (Table 1).42–56 The focus of these predominantly single-site investigations has been on adults; only one study targeted pediatric or young adult recipients.50 Sample sizes varied widely from 15 to 219 (median, 67) Most studies used randomized, controlled trial designs and examined multicomponent interventions delivered by health care professionals across multiple face to face and/or telephone sessions.42,44,46,47,49–52,55,56 These multicomponent interventions typically included education and counseling on medication taking, discussion of adherence barriers and motivation to adhere, goal setting to maximize adherence, and problem solving to eliminate barriers. Feedback on patients’ past adherence, typically on the basis of ongoing EM, was sometimes included. Some interventions attempted to enlist patients’ social supports by, for example, including the family in intervention sessions or counseling patients about how to involve others in their care. Among the single-component studies, one examined EM feedback only,46 and two focused on medication dosing strategies (effect of switching from twice daily to once daily dosing; effect of a pill dispenser that alerted patients when doses were due).51,57

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Table 1.

Studies evaluating interventions to improve immunosuppressant medication adherence in kidney transplant recipients

Studies varied widely in how they assessed adherence outcomes. Some relied exclusively on EM,43,44,46,48 whereas others used pharmacy refills,42,47 blood levels,50,54 or self-reported adherence.51,52 Only three reports assessed adherence using a multimethod strategy.49,55,56

Intervention Efficacy

Because some studies allow effect sizes to be determined, whereas others report only whether statistically significant effects were achieved (with insufficient information to calculate effect size), we summarize the findings by commenting on both overall trends across the reports (i.e., did they find statistically reliable effects?) and the magnitude of intervention effect (i.e., how large were the intervention effect sizes?). In general, findings are mixed. Eight reports found significantly better adherence in intervention recipients relative to control groups (which typically received only usual care) by the end of the intervention period.42,47–49,51,52,55,56 Effect sizes were mostly small to moderate (i.e., r values of 0.10–0.30, where r is the size of the association of intervention [versus control] group membership with better adherence outcomes). Seven of these eight studies tested multicomponent interventions. One additional multicomponent intervention study found better adherence in intervention participants during the intervention period, but the effect dissipated by the last intervention session.46 Four reports failed to identify significant intervention effects43,44,50,54; one of these studies obtained a moderately sized effect favoring the multicomponent intervention, but the sample was too small (n=22) to detect the effect.50 The remaining three reports with nonsignificant findings (one testing a multicomponent intervention and two testing single-component interventions) did not provide effect size information. Method of assessing adherence (e.g., EM, pharmacy refills, or self-report) did not seem linked to whether an intervention was effective.

Maintenance of Intervention Effects

Five studies examined adherence at least several months after the intervention had ended. Two multicomponent studies found that intervention effects endured through 3 months of follow-up.47,52 However, the three others (two multicomponent studies and one single-component intervention study) failed to find any effects at 2–12 months postintervention.43,44,50

Effect on Clinical or Psychosocial Outcomes

Six studies examined whether the interventions influenced outcomes beyond medication adherence,47,49–52,54 including service utilization (e.g., rehospitalization and emergency department visits), clinical measures (e.g., acute graft rejection and mortality), and psychosocial measures (e.g., health-related quality of life). Only one report found any intervention effect: intervention recipients were less likely to be rehospitalized during the 12-month intervention period.47

Summary

Relatively few interventions have been tested. Despite evidence that adolescents and young adults are at greater risk for nonadherence than any other age group,16,35–37 studies that included patients as young as age 18 years old did not consider whether age affected intervention efficacy. Efficacy has been evaluated primarily during the period in which the intervention is offered; whether any effects are maintained after the intervention ends is unclear. Many studies were likely underpowered. Consistent with the literature on intervention effects on medication adherence in other solid organ transplant58–62 and chronic disease populations,63–66 effect sizes were generally small to moderate, indicating that no adherence interventions to date are as effective as would be hoped for in terms of producing successful patient behavior change.

Among the 13 studies, multicomponent interventions seem more likely to be efficacious than single-component interventions; this is similar to the larger literature on medication adherence interventions in transplantation and chronic disease.62–66 However, whether such labor-intensive and often complex interventions would be feasible for general use or beyond the resources and capabilities of transplant teams remains unknown. Moreover, the multicomponent interventions offered to date consist most often of packages of strategies, each created by a single investigative team and not necessarily involving any components previously validated or known to be able to be reliably offered to patients. It is not clear whether the specific educational content, problem-solving efforts, or approaches to motivation and goal setting used in any one investigation are identical to those offered in other investigations. Such differences may contribute to the inconsistent findings on efficacy. Interestingly, when patients are asked what they find most helpful, they cite feedback on their own past adherence (e.g., dosing history from EM),44 and a recent meta-analysis shows feedback to be the most potent component of multicomponent interventions in chronic disease populations.64 This is consistent with the notion of tailored interventions suggested by the results of the qualitative studies discussed earlier.38–40 However, feedback has not consistently been included in the intervention studies with kidney recipients to date (Table 1); those including it tended to be small and underpowered.

In contrast to the potential difficulties of mounting multicomponent interventions, a simple approach, like modification of immunosuppressant dosing from twice to once daily, would seem very reasonable to implement.48 However, Kuypers et al.48 noted important caveats to their findings, including the problem that patients prescribed once daily dosing were more likely to have periods of 1 day or more with no doses taken compared with patients on a twice daily regimen. This report did not examine long-term clinical outcomes, and in general, the intervention studies do not provide strong evidence that any adherence intervention led to any clinical or psychosocial benefits. Lack of compelling evidence from MNA intervention studies may be largely due to power limitations; not only were studies’ sample sizes generally small, but also, follow-up periods were short, likely resulting in too few clinical events for meaningful analysis. Furthermore, as noted in the adherence intervention literature beyond transplant, there is no permanent cure for MNA.65 Thus, adherence interventions likely need to be maintained for as long as the medical treatment in question is needed, requiring that interventions be permanently integrated into care. However, all interventions in transplant recipients have been time limited, and this may explain why they have had minimal clinical effect.

Comment

To conclude, MNA, which adds between $100 and $300 billion to America’s annual health care costs,67,68 is increasingly recognized in kidney transplant recipients. In transplantation, the costs of MNA leading to premature allograft loss go far beyond a simple monetary calculus. Much has been learned about the factors leading to MNA, although our understanding remains far from complete. Research focused on addressing these gaps is one priority area on which to expand. Various intervention strategies have been evaluated, but none to date have been as effective as one would have hoped. Emerging is the complex nature of MNA and the requirement for comprehensive multifaceted interventions. Therefore, clinical trials evaluating multifaceted interventions are a second priority area for research investment. In designing these clinical trials, it will be critical to evaluate not only surrogate end points (i.e., decreasing MNA) but also, the intervention’s effect on clinical outcomes as well (i.e., de novo DSA, late acute rejection, and graft and patient survival). This last point is key if the expectation is for insurers to pay for the costs of interventions. A third priority area is to identify biologically modifiable factors that may limit the effect of MNA in a given patient. For example, transplanting patients with an HLA-mismatched donor below a defined threshold mitigates the effect of MNA.6,69 In summary, MNA is a common problem limiting graft and patient survival, and as such, it should be a top priority area for the academic community, research funders, and insurers.

Disclosures

P.W.N. is currently a consultant for Astellas Pharma (Chicago, IL) and Vitaeris Inc. (Vancouver, BC, Canada) T.E.N. and M.A.D. have no conflicts to disclose.

Acknowledgments

Preparation of this article was supported in part by National Institute of Allergy and Infectious Diseases grant R34 AI18416. P.W.N. is supported by the Flynn Family Chair in Transplantation.

Footnotes

  • Published online ahead of print. Publication date available at www.jasn.org.

  • Copyright © 2017 by the American Society of Nephrology

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Journal of the American Society of Nephrology: 28 (8)
Journal of the American Society of Nephrology
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Understanding Medication Nonadherence after Kidney Transplant
Thomas E. Nevins, Peter W. Nickerson, Mary Amanda Dew
JASN Aug 2017, 28 (8) 2290-2301; DOI: 10.1681/ASN.2017020216

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Understanding Medication Nonadherence after Kidney Transplant
Thomas E. Nevins, Peter W. Nickerson, Mary Amanda Dew
JASN Aug 2017, 28 (8) 2290-2301; DOI: 10.1681/ASN.2017020216
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