Surveillance video shows that a Seattle news helicopter began rotating at takeoff before it pitched forward into a fiery crash that killed both men aboard and burned a third on the ground, the ...
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).
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