Normal sinus rhythm Second degree type I sinoatrial nodal exit block (SA nodal Wenckebach) This ECG strip shows second degree type I sinoatrial nodal exit block, not to be confused with AV nodal ...

Atrial fibrillation with an uncontrolled ventricular response Left bundle branch block Premature ... on this ECG, except for the one beat in lead V1 towards the end of the ECG strip.