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| image1 = E000559.jpg | | image1 = E000559.jpg | ||
| caption1 = A patient with atrial fibrillation with a 'Lewis Lead' | | caption1 = A patient with atrial fibrillation with a 'Lewis Lead' positioning of the leads. Compared with the normal lead configuration, the atrial signal is enlarged. Although some parts have a 'sawtooth' appearance consistent with atrial flutter, the rhythm is atrial fibrillation as there is a changing pattern in the atrial activity. | ||
| image2 = E000557.jpg | | image2 = E000557.jpg | ||
| caption2 = The same patient with a normal lead configuration | | caption2 = The same patient with a normal lead configuration. The rhythm is atrial fibrillation. The atrial activity in lead V1 is organized probably due to a organisation of electrical activity after it enters the right atrial appendage, close to lead V1. | ||
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Throughout history extra lead positions have been tried. Most are rarely used in practice, but they can deliver very valuable diagnostic clues in specific cases. | Throughout history extra lead positions have been tried. Most are rarely used in practice, but they can deliver very valuable diagnostic clues in specific cases. | ||