Abstract
Changes in QRS morphology in ECG precordial leads and the value of these leads for identifying worsening heart failure (HF) have not been fully determined, though the effects of HF status on changes in QRS amplitude [1,2] and transitional zone [3,4] in these leads have been briefly described. When considering the right ventricle being more compliant than the left, it would be expected that expansion of the right ventricle is more than the left under the volume overload in worsening HF, and vice versa at its recovery [5], causing changes in QRS morphology in precordial leads.
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