100 patients without evidence of dysglycemia.

100 patients with evidence of pre-diabetes defined as hemoglobin A1C (HbA1c) 5.7-6.4% with or without fasting plasma glucose (FPG) of 100 mg/dL to 125 mg/dL.

100 patients without evidence diabetes defined as hemoglobin HbA1c > 6.4% with or without FPG >125 mg/dL.

Invasive coronary angiography

The incidence, number and percent, of newly diagnosed diabetes and pre-diabetes in patients with first-time diagnosed coronary artery disease

Clinical and laboratory characteristics of newly diagnosed diabetes and pre-diabetes in Patients with first-time diagnosed coronary artery disease.

Extent of newly diagnosed coronary artery disease in newly diagnosed diabetes and pre-diabetes. The severity of coronary artery disease will be assessed using the SYNTAX score.

Assessment will include in-hospital and 1-month major adverse cardiac events (MACE), recurrent angina, stent thrombosis, need for emergent/urgent coronary intervention, clinical heart failure and left ventricular dysfunction.