Association of total serum antioxidant capacity with the Tei index in echocardiography in patients with microvascular angina

OBJECTIVESCardiac syndrome X (CSX) is a condition characterized by exercise-induced chest pain that occurs considering a normal coronary angiogram. We aimed to investigate the total serum antioxidant capacity (TAC) and biventricular global functions using echocardiography in patients with CSX. PATIENTS AND METHODSThe study population included 55 patients with typical anginal symptoms and a positive exercise stress test, or ischemia in myocardial perfusion scintigraphy and normal coronary arteries detected angiographically, and 49 healthy volunteers with atypical chest pain and a negative stress test. TAC was assessed from blood samples. Transthoracic echocardiography was performed for the entire study population. The Tei index was calculated using the formula IVCT+IVRT/ET. RESULTSTAC was found to be significantly lower in the CSX group compared with the control group (0.70±0.37 vs. 1.5±0.30, respectively, P