METHODS

Research design and location. This study uses a quasi-experimental design with two repeated surveys after the baseline. Face-to-face interviews and telephone calls with the same patients with unstable angina before and one month and three months after PCI were conducted at the National Heart Institute, Vietnam.
Sample size and participants . All patients who visited the Vietnam Heart Institute from September 2016 as baseline to February 2017 as post line and met criteria were included. Those who were diagnosed with unstable angina (UA), received PCI in the Vietnam National Heart Institute and agreed to participant were interviewed. The patient was excluded if s/he had associated chronic diseases such as cancer and COPD, or died after intervention. In total, 120 out of 127 patients were enrolled in this study, which gave a response rate of 94.5%.