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).
Smithsonian Magazine on MSN
James Webb Space Telescope Reveals That Most Galaxies Rotate Clockwise
NASA’s James Webb Space Telescope (JWST) launched into orbit around the sun in December 2021. Since then, it has been ...
From space, the Iberian Peninsula – primarily occupied by Spain and Portugal – looks like an immovable solid block of land anchoring southwestern Europe. But beneath that apparent stability, the ...
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