Question: Could you explain to me what electrocardiographic alterations are observed in a patient who has a complete heart branch block, either right or left? Jacinto (Castellón).
Answer: Each wave has a duration that we call abnormal if it exceeds certain limits. In the case of complete blocks, the QRS complex is said to be wider than normal (more than 120 ms). In the case of right bundle branch block, there are alterations in the QRS (wider) with a peculiar morphology, more marked in the electrocardiographic leads that face that part of the heart, the right precordial leads.