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33 bytes removed, 10:45, 19 January 2012
m
Lead reversals
* '''Chest lead reversals''' lead to inappropriate R wave progression (increase-decrease-increase) and are often easily recognized.
Therefore '''any right axis or small signal in an extremity lead''' should be reason enough to check lead positioning. A previous ECG can be very helpful.
<div style="float:right"><gallery>Image:cableReversal1.png|Right and left arm lead reversal can be distinguished from the (much rarer) dextrocardia by examination of the precordial R wave progression.Image:cableReversal2.png|Right arm and left leg lead reversal. Lead II now measures the signal between the left and right leg, which is remote from the heart.Image:dextrocardia.jpg|A patient with dextrocardia (and previous inferior myocardial infarction)</gallery></div>
More specific patterns with every lead reversal:
*right and left arm electrodes:
It is possible to distinguish lead reversal and [[w:Dextrocardia|dextrocardia]] by watching the precordial leads. Dextrocardia will not show any R wave progression in leads V1-V6, whereas lead reversal will.
<gallery>Image:cableReversal1.png|Right and left arm lead reversal can be distinguished from the (much rarer) dextrocardia by examination of the precordial R wave progression.Image:cableReversal2.png|Right arm and left leg lead reversal. Lead II now measures the signal between the left and right leg, which is remote from the heart.Image:dextrocardia.jpg|A patient with dextrocardia (and previous inferior myocardial infarction)</gallery>
{{clr}}

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