In a “normal” electrocardiogram (ECG), the transition of the QRS axis in the precordial leads occurs between leads V 3 and V 4 (i.e., there is a dominant S in V 3 and a dominant R in V 4).
MOLINE, Ill. — We've all likely seen at least one tornado in our lifetime, whether it be via a video or in person. One thing the majority of those tornadoes have in common? The direction in which they ...
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