Clockwise and Counterclockwise rotation: Difference between revisions
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Clockwise and Counterclockwise rotation (view source)
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Clockwise and counterclockwise rotation refer to a change in the electrical activity in a horizontal plane through the heart. Imaginge the observer standing at the feet of the patient who is in bed. If the electrical activity of the heart has turned more to the right side of the patient this is called ''counterclockwise rotation''. If the electrical activity of the heart has turned more to the left side of the patient this is called ''clockwise rotation''. | [[File:rwaveprogression.svg|thumb|right|300px|Normal R wave progression]]Clockwise and counterclockwise rotation refer to a change in the electrical activity in a horizontal plane through the heart. Imaginge the observer standing at the feet of the patient who is in bed. If the electrical activity of the heart has turned more to the right side of the patient this is called ''counterclockwise rotation''. If the electrical activity of the heart has turned more to the left side of the patient this is called ''clockwise rotation''. | ||
Clockwise and counterclockwise rotation can be assessed only in the chest-leads (V1 - V6). Normally the R wave amplitude increases from V1 to V5. Around V3 or V4 the R waves become larger than the S waves and this is called the 'transitional zone'. If the transition occurs at or before V2, this is called counterclockwise rotation. If the transition occurs after V4, this is called clockwise rotation. | Clockwise and counterclockwise rotation can be assessed only in the chest-leads (V1 - V6). Normally the R wave amplitude increases from V1 to V5. Around V3 or V4 the R waves become larger than the S waves and this is called the 'transitional zone'. If the transition occurs at or before V2, this is called counterclockwise rotation. If the transition occurs after V4, this is called clockwise rotation. | ||