Editor's Comment (H.D.M.): 2-1 or 3-1 conduction may be due to a block localized in the A-V node (narrow QRS). Under such conditions, it is a variation of Mobitz type I and is usually a benign asymptomatic condition, and, therefore, a very rare, if ever, indication for pacing. 2-1 or 3-1 conduction may also be due to a block in the bundle-branch system; it therefore may be a variation of Mobitz type II block and is often symptomatic, and, therefore, is a common justification for pacemaking implantation.
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