A Second Degree AV Block Type II (Mobitz) is a more serious arrythmia than Type I (Wenckebach) because it results in a non-conducted P wave. It is almost always a disease of the distal conduction system (bundle of His or Purkinje Fibres), and almost always leads to a Third Degree Av Block (Complete Heart Block).
Second Degree AV Block Type II (Mobitz) ECG
Heart Rate: the atrial rate is usually that of the underlying rhythm, but the ventricle rate is less than normal.
Rhythm: the atria is usually regular, where as the ventricles are irregular.
P Waves: Normal
PR Interval: Normal.
QRS Complexes: abnormal and usually prolonged (greater than 0.12 seconds)
Second Degree AV Block Type II (Mobitz) Signs and Symptoms
The patient is usually starting to show signs of poor perfusion, such as mild confusion and cool, pale, clammy skin. The patient my experiences symptoms such as dizziness, chest pain, chest tightness, and palpitations.