V1 and V2 electrodes should be placed in the 4th intercostal space, either side of the sternum. All too often this space is not accurately located. If you spot that the QRS complex in V1 has developed ‘evil bunny ears’ (rSr’), check the electrode placement – there are other causes but high electrode misplacement is all too common. Other signs include negative P and T waves in V2, or a larger negative component to a biphasic P wave in V1 and V2.See also: Electrode misplacement
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