ECG characteristics:

Mechanism:

• Acute systolic overload of the right ventricle as a result of occlusion of one or more arteries in the pulmonary end circulation

ECG characteristics:

• Often renewed occurrence of right bundle branch block
  
• SI–qIII type
  
• S in V5 and V6
  
• ST elevation and T wave inversion in III, V1–3
  
• P pulmonale
  
• Atrial and ventricular arrhythmias