Cardiovascular Health and Texting Messaging (CHAT) Study

Study Overview
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Brief Summary
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The study is a two-arm, parallel, randomized clinical trial. The purpose of the study is to evaluate the effectiveness of automated mobile phone text message-based intervention for secondary prevention, including lifestyles modification, medication adherence improvement and risk factors control among coronary heart disease (CHD) patients without diabetes. The participants will be randomized into intervention and control groups in a 1:1 ratio. The intervention group will receive 6 pre-designed text messages per week in addition to usual care for 6 months, while the control group will receive usual care.

Detailed Description
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Objective: This study aims to evaluate the effectiveness of automated mobile phone text message-based intervention for secondary prevention, including lifestyles modification, medication adherence improvement and risk factors control among CHD patients without diabetes. We hypothesized that an intervention using mobile phone text based education and reminder can improve risk factors control and medication adherence for CHD patients. Study design: The study is a two-arm, parallel, randomized clinical trial. Patients will be eligible if they have documented CHD defined as having history of myocardial infarction and PCI but without diabetes mellitus, have the capability of reading and sending short message, and are able to provide informed consent. Patients who do not have an active mobile phone will be excluded. The eligible participants will be allocated into intervention and control groups in a 1:1 ratio randomly. The intervention group will receive intervention of pre-designed text messages in addition to usual care, while the control group will receive usual care. All the participants will be followed up for 6 months. Study intervention: Participants in the intervention group will receive semi-personalized text messages for 6 months as well as usual care. Non-smokers will receive two general messages, two hypertension messages, one medication adherence message and one physical activity message per week. Smokers will receive one general message, two hypertension messages, one medication adherence message, one physical activity message and one smoking cessation message per week. Outcome measures: The primary endpoint is systolic blood pressure control. Secondary endpoints include a change in proportion of patients achieving a systolic blood pressure<140mm Hg, physical activity, medication adherence, smoking cessation, low-density lipoprotein cholesterol (LDL-C) and body mass index (BMI). Exploratory endpoints include long-term prognosis of the patients, such as death, non-fatal myocardial infarction, stroke and so on, as well as health status (SAQ and EQ-5D). Statistical analysis: Evaluation will be carried out on an intention-to-treat basis. Values of analyzed endpoints between intervention group and control group will be compared according to the analysis plan. We'll follow a prespecified analysis plan and subgroup analysis will be conducted accordingly.

Official Title
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Effectiveness of Text Messaging on Risk Factors Control and Medication Adherence Among Coronary Heart Disease Patients Without Diabetes in Cardiovascular Health and Texting Messaging (CHAT) Study

Conditions
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Coronary Artery Disease

Intervention / Treatment
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* Behavioral: Text Messaging


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Participants with coronary artery disease defined as history of myocardial infarction and percutaneous coronary intervention (PCI) Capability to read and send text messages Exclusion Criteria: History of diabetes Assumed poor adherence Do not have an active mobile phone

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 90 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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Design Details

Primary Purpose: Supportive Care
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Intervention-Text messaging<br>Patients will receive regular semi-personalized text messages for 6 months. Each participants will receive 6 text messages per week, which will be sent at random times of the day (9.00am, 12noon, 4.00pm). Non-smokers will receive two general messages, two hypertension messages, one medication adherence message and one physical activity message per week. Smokers will receive one general message, two hypertension messages, one medication adherence message, one physical activity message and one smoking cessation message per week. | Behavioral: Text Messaging<br>* Patients will receive regular semi-personalized text messages for 6 months. Each participants will receive 6 text messages per week, which will be sent at random times of the day (9.00am, 12noon, 4.00pm). Non-smokers will receive two general messages, two hypertension messages, one medication adherence message and one physical activity message per week. Smokers will receive one general message, two hypertension messages, one medication adherence message, one physical activity message and one smoking cessation message per week. Prior to study commencement, a bank of 280 messages have been developed based on guidelines and behavior change theory (BCT), and have underwent multidisciplinary expert review and qualitative review process.<br>|
| No Intervention: Control<br>Participants in the control group will receive 2 thank-you messages per month and undertake routine clinical practice. | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change in systolic blood pressure obtained in office during each interview | The investigators will measure the change in systolic blood pressure from baseline to 6 months. | Baseline; 6months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change in proportion of patients achieving a SBP<140mm Hg | The investigators will measure the proportion of patients achieving a SBP<140mm Hg from baseline to 6 months. | Baseline; 6months | 
| Change in low-density lipoprotein cholesterol (LDL-C) level | The investigators will measure the change in LDL-C level from baseline to 6 months. | Baseline; 6months | 
| Change in body mass index (BMI) | The investigators will measure the change in BMI from baseline to 6 months. | Baseline; 6months | 
| Change in medication adherence | The investigators will measure the change in medication adherence from baseline to 6 months. | Baseline; 6months | 
| Change in level of physical activity measured via International Physical Activity Questionnaire (IPAQ) scale | The investigators will measure the change in IPAQ scale from baseline to 6 months. | Baseline; 6months | 
| Change in proportion of non-smokers | The investigators will measure the proportion of non-smokers via self report and cotinine urine strip test from baseline to 6 months. The patients who report as non-smokers with negative cotinine test result will be defined as non-smokers. | Baseline; 6months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Coronary artery disease, Text messages, Blood pressure, Lifestyle, Risk factors