Accepted
at 7:12 p.m. Jan, 14, 2024
by
thyrolobule
Author:
Fikthenig
Co-authors:
thyrolobule
Type of change:
Updated content
Rationale for change
To clarify that we are talking about degrees rather than normality
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After
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The QRS complex: the QRS axis is about 0°. It is nearly biphasic in aVF, implying an axis of 0° or 180°. Because the QRS complex in lead I has a tall R wave, the axis must be 0°.
The P wave: in lead aVL, the P-wave is virtually invisible (isoelectric), so the P-wave axis must lie perpendicular to this lead and is either 60° or -120°. Since the P-wave is positive in leads I and aVF. the axis must be 60°
The T wave: all of the leads with tall R waves have positive T-waves. The T-waves are flat in lead III, indicating an axis perpendicular to lead III (either +30° or -150°). Because there is a tall T-wave in lead I, the axis must be about +30°
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