Abstract
Our aim was to evaluate the acute cardiac toxicity of adjuvant trastuzumab treatment and its possible relation to changes in oxidative stress. Electrocardiographic and echocardiographic tissue Doppler imaging (TDI) parameters, activity of antioxidant enzymes (superoxide dismutase; SOD), and products of oxidative stress (malondialdehyde; MDA) were analyzed in 30 patients with early-stage breast cancer who had adjuvant trastuzumab treatment. There was a significant prolongation of QT interval after trastuzumab treatment. There was also a significant decrease in left ventricular ejection fraction (LVEF), TDI-derived S' parameters, and SOD enzyme activity and increase in MDA levels after trastuzumab infusion. There was a positive correlation between changes in SOD activity and LVEF and a negative correlation between changes in MDA levels and LVEF. This study demonstrated a correlation between decreases in LVEF and increases in products of the oxidative stress in patients who had adjuvant trastuzumab treatment.
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