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Is Surface ECG a Useful Surrogate for Subcutaneous ECG?

Background: Surface electrocardiograms (ECGs) have been used as surrogates for subcutaneous ECGs to optimize and evaluate subcutaneous devices, but differences between surface and subcutaneous ECGs remain poorly understood. This study evaluated the correspondence between surface and subcutaneous ECGs in Reveal® Plus (Medtronic Inc., Minneapolis, MN, USA) patients during various maneuvers.