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Problems with non-adherence to antipsychotic medication in Samoan new Zealanders: A literature review

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      Abstract

      This paper explores what is known about adherence to antipsychotic medications in general and the possible reasons for non-adherence in Samoan New Zealanders. Samoan New Zealanders are either Samoan-born immigrants or their descendents born in New Zealand. Clinicians recognize a high prevalence of non-adherence among Samoan New Zealanders. The authors hypothesize that traditional Samoan beliefs play a prominent role in problems with adherence. To investigate this hypothesis, a review of the literature on adherence in Samoan New Zealanders was undertaken. Documents from the Ministry of Health support the hypothesis. To investigate this issue, the Ministry of Health initiated a qualitative research project to examine the nature of Samoan traditional beliefs. The results of this study are summarized. No research had previously been undertaken on adherence in Samoan New Zealanders. In general, there is a lack of research on all aspects of the mental health of Pacific peoples in New Zealand. Literature reviews of adherence research consistently show that interventions that improve adherence address the beliefs, behaviours, and relationships surrounding adherence. This finding supports the author's hypothesis that traditional beliefs play an important role in the problem of adherence. Further definitive study with Samoan New Zealanders is required.

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      Most cited references 53

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      Prevalence of and risk factors for medication nonadherence in patients with schizophrenia: a comprehensive review of recent literature.

      Nonadherence to prescribed antipsychotic medications places patients with schizophrenia at a greatly increased risk of illness exacerbation and rehospitalization. Identification of risk factors for nonadherence is an initial step toward designing effective interventions. This article reviews recent literature on the prevalence of and risk factors for medication nonadherence in patients with schizophrenia. We searched the MEDLINE/HealthSTAR and PsycINFO databases using combinations of the keywords risk factor(s), adherence, compliance, antipsychotic, neuroleptic, schizophrenia, and psychosis for articles published since 1980 that identified risk factors for medication nonadherence in schizophrenia patients. We included reports that (1) were published in English and (2) specifically examined risk factors for medication nonadherence. Thirty-nine articles met our selection criteria. Among the 10 reports that met a strict set of study inclusion criteria, we found a mean rate of nonadherence of 41.2%; the 5 reports that met a stricter set of inclusion criteria had a mean nonadherence rate of 49.5%. In the 39 articles reviewed, factors most consistently associated with nonadherence included poor insight, negative attitude or subjective response toward medication, previous nonadherence, substance abuse, shorter illness duration, inadequate discharge planning or aftercare environment, and poorer therapeutic alliance. Findings regarding an association between adherence and medication type were inconclusive, although few studies explored this relationship. Other factors such as age, gender, ethnicity, marital status, education level, neurocognitive impairment, severity of psychotic symptoms, severity of medication side effects, higher antipsychotic dose, presence of mood symptoms, route of medication administration, and family involvement were not found to be consistent predictors of nonadherence. Limitations of the published literature are discussed. Efforts to improve medication adherence in patients with schizophrenia should target relevant risk factors.
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        Effectiveness of interventions to improve patient compliance: a meta-analysis.

         R Merisca,  D Cretin,  D Roter (1998)
        This article summarizes the results of 153 studies published between 1977 and 1994 that evaluated the effectiveness of interventions to improve patient compliance with medical regimens. The compliance interventions were classified by theoretical focus into educational, behavioral, and affective categories within which specific intervention strategies were further distinguished. The compliance indicators broadly represent five classes of compliance-related assessments: (1) health outcomes (eg, blood pressure and hospitalization), (2) direct indicators (eg, urine and blood tracers and weight change), (3) indirect indicators (eg, pill count and refill records), (4) subjective report (eg, patients' or others' reports), and (5) utilization (appointment making and keeping and use of preventive services). An effect size (ES) r, defined as Fisher's Z transformation of the Pearson correlation coefficient, representing the association between each intervention (intervention versus control) and compliance measure was calculated. Both an unweighted and weighted r were calculated because of large sample size variation, and a combined probability across studies was calculated. The interventions produced significant effects for all the compliance indicators (combined Z values more than 5 and less than 32), with the magnitude of effects ranging from small to large. The largest effects (unweighted) were evident for refill records and pill counts and in blood/urine and weight change studies. Although smaller in magnitude, compliance effects were evident for improved health outcomes and utilization. Chronic disease patients, including those with diabetes and hypertension, as well as cancer patients and those with mental health problems especially benefited from interventions. No single strategy or programmatic focus showed any clear advantage compared with another. Comprehensive interventions combining cognitive, behavioral, and affective components were more effective than single-focus interventions.
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          Cost of relapse in schizophrenia.

           P Weiden,  M Olfson (1994)
          To estimate the national annual cost of rehospitalization for multiple-episode schizophrenia outpatients, and to determine the relative cost burden from loss of medication efficacy and from medication noncompliance, the yearly number of neuroleptic-responsive multiple-episode schizophrenia inpatients in the United States who are discharged back to outpatient treatment was estimated. The cohort at risk for future relapse and rehospitalization was determined. The research literature on the expected rates of relapse for schizophrenia patients on maintenance antipsychotic medication was reviewed; in particular, monthly relapse rates under the optimal medication conditions of compliant patients taking optimal doses of a depot neuroleptic (optimal neuroleptic dose) and under the less optimal conditions of patients stopping medication (medication noncompliant) was estimated. Using established noncompliance rates from the literature, it became possible to estimate a "real world" rehospitalization rate for this cohort, as well as the relative burden accruing from loss of medication efficacy and from medication noncompliance. Finally, cost estimates for index hospitalizations and rehospitalizations were derived from data on national expenditures for inpatient mental health care. The monthly relapse rates are estimated to be 3.5 percent per month for patients on maintenance neuroleptics and 11.0 percent per month for patients who have discontinued their medication. Postdischarge noncompliance rates in community settings are estimated to be 7.6 percent per month. These estimates were entered into a survival analysis model to determine the real world relapse rate of this cohort. An estimated 257,446 multiple-episode (> or = two hospitalizations) schizophrenia patients were discharged from short-stay (< or = 90 days) inpatient units in the United States during 1986. The estimated aggregate baseline inpatient cost for the index hospitalizations of this cohort was $2.3 billion (1993 dollars). Within 2 years after discharge, the aggregate cost of readmission approached $2 billion. Loss of neuroleptic efficacy accounted for roughly 60 percent of the rehospitalization costs and neuroleptic noncompliance for roughly 40 percent. The economic burden due to loss of efficacy is relatively higher during the first postdischarge year, whereas the burden from noncompliance is higher in the second year. Because loss of medication efficacy and medication noncompliance act synergistically on relapse, substantial inpatient cost savings can be realized by linking better pharmacologic treatments of schizophrenia with more effective strategies to manage medication noncompliance.
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            Author and article information

            Affiliations
            [1 ]Mangere Community Health Trust (Primary Health Organisation) Auckland, New Zealand
            [2 ]Mental Health Unit, Cairns Base Hospital Cairns, Queensland, Australia
            Author notes
            Laurie Jo Moore, Cairns Base Hospital Mental Health Unit, PO Box 902, Cairns, QLD 4870, Australia.

            Itagia Ioasa-Martin, RN, MA, MA (Applied) Nursing.

            Laurie Jo Moore, MD, ABPN, FRANZCP.

            Journal
            Int J Ment Health Nurs
            Int J Ment Health Nurs
            inm
            International Journal of Mental Health Nursing
            Blackwell Publishing Asia (Melbourne, Australia )
            1445-8330
            1447-0349
            August 2012
            : 21
            : 4
            : 386-392
            22417230
            3506738
            10.1111/j.1447-0349.2011.00801.x
            © 2012 The Authors. International Journal of Mental Health Nursing © 2012 Australian College of Mental Health Nurses Inc

            Re-use of this article is permitted in accordance with the Creative Commons Deed, Attribution 2.5, which does not permit commercial exploitation.

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