The r wave amplitude should increase in the normal chest lead of ECG,and R/S should increase gradually,but in some pathological and physiological conditions the poor R wave progression or reverse increment exist,in this case,only the body surface electrocardiogram cannot make a definite diagnosis,and vectorcardiogram serves as another way to record the heart electricity excited method,it can reflect the space between the electrode position,compared with electrocardiogram inspection,it has obvious advantages...
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