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of 25% or more of the subsequent R wave, or being > 0.04 s (40 ms) in width and > 2 mm in amplitude. However, diagnosis requires the presence of this pattern in more than one corresponding lead.

R wave progression

Looking at the precordial leads, the R wave usually progresses from showing an rS-type complex in V₁ with an increasing R and a decreasing S wave when moving toward the left side. There is usually a qR-type of complex in V₅ and V_6, with the R-wave amplitude usually taller in V₅

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