2:1 AV block

Every other P conducts, so there is no PR sequence to read — which is why this is the one second-degree block that cannot be called Mobitz I or II.

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The spec that drew it

Rhythm

two_to_one_block

Format

Rhythm strip

More in Blocks & conduction

• Wenckebach (Mobitz I)
• Mobitz II
• Complete block, narrow escape
• High-grade block with escape
• Junctional escape over a slow sinus
• WPW pre-excitation
• Left bundle branch block

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