Quality Measurement and Improvement Study of Surgical Coronary Revascularization: Medication Adherence

The study is a randomized controlled trial, having a plan to recruit 1000 patients underwent coronary artery bypass grafting in 1 of 5 participating sites in 2015, and randomized to either the intervention group or control group, to test the effectiveness of a smartphone based application (APP) focusing on improving patients medication adherence. Patients randomized to the intervention group install the APP in their smartphones with personnel information and physicians' medication descriptions. The APP reminds at the time of taking medications, educates them on secondary prevention for coronary artery disease, and collects their weekly situations by questionaires. Investigators will follow-up patients by face to face or telephone interview. The 6-month effects of the intervention are evaluated.