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Ladder diagram to illustrate beats between pauses. The first beat is conducted with first degree AV block and LAFB. His extra systole is conducted with RBBB (Ashman aberrancy). Prolongation of PR interval of the next sinus beat can be explained by concealed conduction from His extra systole. 3rd sinus beat is conducted in a normal manner. 4th sinus beat is blocked in the AV node due to concealed conduction from previous extra systole resulting in a pause.
