Atrioventricular Block: 2nd Degree, Mobitz II

ECG Features

Figure 1: ECG Strip[1]

A second degree, Mobitz II atrioventricular (AV) block indicates "intermittent non-conducted P waves ('dropped' QRS complexes) without progressive prolongation of the PR interval."[2]

Table 1: ECG Characteristics[3]

Clinical Significance[2]

  • 2nd degree, Mobitz II heart block is commonly associated with haemodynamic compromise, severe bradycardia, and advancement to 3rd degree heart block (complete heart block).
  • Onset of haemodynammic instability can be abrupt and unanticipated and may trigger syncope or sudden cardiac death.

ECM Features

Additional Information


    1. Second Degree Heart Block Type II [Online image]. (2013). Retrieved July 19, 2016, from
    2. AV Block: 2nd degree, Mobitz II. (n.d.). Retrieved July 27, 2016, from