BIOchemical Urine Analysis of Adherence to Statins and Associated FACTorS in Coronary Artery Disease

Study Overview
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Brief Summary
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Feasibilty study of biochemical urine analysis of adherence to high intensity statin therapy in outpatients with coronary artery disease

Detailed Description
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Background: Statin therapy is known to improve clinical outcomes in patients with coronary artery disease (CAD), while being highly cost-effective. However, adherence to statin therapy in real world settings is suboptimal and represents a possible target to ameliorate secondary CAD disease prevention. Previous interventional studies on statin adherence showed inconsistent results and it is widely acknowledged that a tailored adherence improvement approach adapted to patient determinants is required. However, methodology to accurately detect and characterize non-adherent patients is challenging and constitutes an important obstacle to developing such interventions. Urine analysis with liquid chromatography/mass spectrometry (LC-MS) for detection of statin intake is a promising method for objective measurement of adherence as an adjunct to subjective adherence assessment using questionnaires, which has not been applied in CAD patients in Germany. Objectives: In this pilot study (i) a feasibility testing of objective (LC-MS urine analysis) and subjective (questionnaire survey) measures of adherence to statin therapy will be performed, (ii) the prevalence of nonadherence in the target population will be determined , and (iii) instruments assessing possible factors associated with (non-)adherence (e.g. side effects, beliefs about medications, and disease-related knowledge) will be evaulated, in order to establish a methodological ground for further studies characterizing non-adherent patients. Methods: Outpatients with CAD treated in University Hospital Düsseldorf and receiving guideline-recommended atorvastatin or rosuvastatin on prescription will be included in the pilot study. Based on sample size calculation about 130 patients will be recruited. A biochemical method of objective urine measurement of statin intake by LC-MS will be combined with a preselected set of questionnaires on adherence behavior and associated factors. Clinical characteristics will be obtained from patient records. A sub-sample of the study population will be invited to participate in the interview for the evaluation of the questionnaire survey. Outlook: Based on the results of the pilot study, an adequately powered study to characterize non-adherent patients and identify patterns of non-adherence will be conducted. The results will be used for the development of a complex tailored intervention for non-adherent patients in Germany.

Official Title
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Feasibility of BIOchemical Urine Analysis of Adherence to Statins and Associated FACTorS in Coronary Artery Disease: The BIO-FACTS Pilot Study

Conditions
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Coronary Heart Disease

Intervention / Treatment
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* Diagnostic Test: blood and urine samples


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: patients with coronary artery disease prescription of atorvastatin or rosuvastatin Exclusion Criteria: < 18 years impairment (e.g. dementia) language barrier (German) end-stage kidney disease with hemodialysis

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Intervention/Treatment |
| --- |
|Diagnostic Test: blood and urine samples|blood and urine samples|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Recrutiment Rate | Recruitment will be assessed by proportion of eligible patients (in %) that agree to participate in the study | through study completion, approximately 1 year | 
| Rate of participating patients (in %) from whom a urine sample can be obtained that is suitable for detection analysis of atorvastatin or rosuvastatin by liquid chromatography/mass spectrometr | Rate of participating patients (in %) from whom a urine sample can be obtained that is suitable for detection analysis of atorvastatin or rosuvastatin by liquid chromatography/mass spectrometry | through study completion, approximately 1 year | 
| Rate of urine samples (in %) from which a valid result of liquid chromatography/mass spectrometry analysis for detection of atorvastatin or rosuvastatin can be obtained. | Rate of urine samples (in %) from which a valid result of liquid chromatography/mass spectrometry analysis for detection of atorvastatin or rosuvastatin can be obtained. | through study completion, approximately 1 year | 
| Average time (in minutes) that is needed by the study personnel to inform the patient about the study, receive written informed consent, hand out and retrieve the study questionnaire, and obtain a urine sample from the participant. | Average time (in minutes) that is needed by the study personnel to inform the patient about the study, receive written informed consent, hand out and retrieve the study questionnaire, and obtain a urine sample from the participant. | through study completion, approximately 1 year | 
| Average time (in minutes) that is needed by the participants to complete the study questionnaire | Average time (in minutes) that is needed by the participants to complete the study questionnaire | through study completion, approximately 1 year | 
| Rate of questions (in %) in the study questionnaire that are completely answered by participants | Rate of questions (in %) in the study questionnaire that are completely answered by participants | through study completion, approximately 1 year | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Rate of patients (in %) in whom atorvastatin or rosuvastatin is detected by liquid chromatography/mass spectrometry analysis of a urine sample | Prevalence of statin adherence assessed by urine analysis | through study completion, approximately 1 year | 
| Rate of patients (in %) who report good adherence atorvastatin or rosuvastatin assessed by Medical Adherence Report Scale (MARS-D) | Prevalence of statin adherence assessed by questionnaire | through study completion, approximately 1 year | 
| Rate of patients (in %) from whom information on concomitant medication other than atorvastatin or rosuvastatin can be obtained from medical records |  | through study completion, approximately 1 year | 
| Rate of patients (in %) from whom information on comorbidities (i.e., cerebrovascular disease, peripheral artery disease, arterial hypertension, and heart failure, or other comorbidities) can be obtained from medical records |  | through study completion, approximately 1 year | 
| Rate of patients (in %) from whom socio-demographic information (i.e., level of education and income) can be obtained by the study questionnaire. | Rate of patients (in %) from whom socio-demographic information (i.e., level of education and income) can be obtained by the study questionnaire. | through study completion, approximately 1 year | 
| Rate of patients (in %) from whom information on perceived side-effects of statin therapy can be obtained by the study questionnaire (open question). | Rate of patients (in %) from whom information on perceived side-effects of statin therapy can be obtained by the study questionnaire (open question). | through study completion, approximately 1 year | 
| Rate of patients (in %) from whom information on patients' concerns about medications assessed by Beliefs about Medicines Questionnaire (BMQ-D) can be obtained by the study questionnaire | Rate of patients (in %) from whom information on patients' concerns about medications assessed by Beliefs about Medicines Questionnaire (BMQ-D) can be obtained by the study questionnaire | through study completion, approximately 1 year | 
| Rate of patients (in %) from whom information on anxiety and depression on the Hospital Anxiety and Depression Scale can be obtained by the study questionnaire. | Rate of patients (in %) from whom information on anxiety and depression on the Hospital Anxiety and Depression Scale can be obtained by the study questionnaire. | through study completion, approximately 1 year | 
| Rate of patients (in %) from whom information on health-related quality of life measured by the The Short Form (12) Health Survey (SF-12) can be obtained by the study questionnaire | Rate of patients (in %) from whom information on health-related quality of life measured by the The Short Form (12) Health Survey (SF-12) can be obtained by the study questionnaire | through study completion, approximately 1 year | 
| Rate of patients (in %) from whom information on social integration measured by the Social Integration Index can be obtained by the study questionnaire | Rate of patients (in %) from whom information on social integration measured by the Social Integration Index can be obtained by the study questionnaire | through study completion, approximately 1 year | 
| Rate of patients (in %) from whom information on social support measured by the Oslo-3-Social-Support-Scale can be obtained by the study questionnaire | Rate of patients (in %) from whom information on social support measured by the Oslo-3-Social-Support-Scale can be obtained by the study questionnaire | through study completion, approximately 1 year | 
| Rate of patients (in %) from whom information on health locus of control (open question) can be obtained by the study questionnaire | Rate of patients (in %) from whom information on health locus of control (open question) can be obtained by the study questionnaire | through study completion, approximately 1 year | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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coronary artery disease, statin, atorvastatin, Rosuvastatin, adherence, biochemical urine testing of adherebnce