Naming of the waves in the QRS complex. Naming of the waves in the QRS complex is easy but frequently misunderstood. The following rules apply when naming the waves:
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• A deflection is only referred ... View MoreNaming of the waves in the QRS complex. Naming of the waves in the QRS complex is easy but frequently misunderstood. The following rules apply when naming the waves:
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• A deflection is only referred to as a wave if it passes the baseline.
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• If the first wave is negative then it is referred to as Q-wave. If the first wave is not negative, then the QRS complex does not possess a Q-wave, regardless of the appearance of the QRS complex.
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• All positive waves are referred to as R waves. The first positive wave is simply an "R-wave" (R). The second positive wave is called "R-prime wave" (R'). If a third positive wave occurs (rare) it is referred to as "R-bis wave" (R").
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•Any negative wave occurring after a positive wave is an S-wave. Large waves are referred to by their capital letters (Q, R, S), and small waves are referred to by their lower-case letters (q, r,s).
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