Testing Strategies to Improving Warfarin Adherence

Inclusion Criteria:

• 21 years old age or older
• On warfarin managed at the AC clinic
• Target INR 2.0-3.0 or 2.5-3.5
• At maintenance phase of therapy (defined as stable INR with stable warfarin dosing over at least 2 consecutive visits)

Exclusion Criteria:

• Do not have access to telephone line
• Unwillingness to participate or to sign a consent form(refusal)
• Inability to participate because of advances dementia, advanced Alzheimer's disease or other impairment affecting ability to provide informed consent and/or quality data or utilize the Med-eMonitor
• Participation in a current study that does not permit participation in another study
• End stage or terminal illness with anticipated life expectancy of 6 months or less
• INR over the upper limit for the individual's range at the time of enrollment (e.g.,>3.0 or >3.5, depending on the target range)
• Diagnosed with antiphospholipid antibody syndrome or abnormal INR prior to starting warfarin