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Mechanism of Coumel’s Sign
Orthodromic atrioventricular reentrant tachycardia using the left-sided accessory pathway in the absence and presence of left bundle branch block. On the right, with the left bundle branch block, the circuit passes through the right bundle and takes longer to reach the left-sided accessory pathway. Printed with permission from © 2022 Mount Sinai Health System. AV = atrioventricular node; SA = sinoatrial node.
