Over 366 million individuals throughout the world have diabetes mellitus (DM), and by 2030, that number is projected to increase to 522 million. Diabetes' macrovascular consequences raise the risk of illness and death. Systolic and diastolic dysfunction are caused by ischemic heart disease, although diastolic function appears to be more vulnerable to ischemia than systolic function. We thus look into the connection between coronary artery disease severity and left ventricular (LV) diastolic performance in diabetic individuals presenting with symptoms similar to angina. Objective: to assess the connection between 2D echocardiography and the SYNTAX score, as well as the amount and severity of left ventricular diastolic dysfunction in diabetic individuals. Patients and methods: one hundred patients undergoing elective angiography of coronaries were enrolled in the research with assessment for LV diastolic and systolic function by transthoracic echocardiography before coronary angiography. This study was carried out at cardiovascular department Azhar-Assiut university hospital and Sohag Cardiac Specialized center, from December 2020 to December 2021.