This is a retrospective study using medical records in two hospitals affiliated to the Catholic University of Korea. Patients with diabetes mellitus who received insulin are retrospectively enrolled. Among those, only patients who underwent coronary CT scan for more than two times will be included. Included patients will be classified into DPP4-inhibitor group and no DPP4-inhibitor group according to the prescribed medication. The changes in obstructive coronary artery disease prevalence and coronary calcium score per one year will be compared between the two groups.
The study aim is to evaluate whether DPP4-inhibitor could reduce coronary atherosclerosis assessed by CT scan in patients receiving insulin for diabetes mellitus. In this retrospective study, changes in obstructive coronary artery disease prevalence and coronary calcium burden between two coronary CT scans will be compared in patients with and without receiving DPP4-inhibitor.