Final answer:
Anterior myocardial infarction often causes conduction disturbances like AV nodal and infra-Hisian blocks, which are observable as different degrees of blocks on an ECG and represent disruptions in the heart's electrical pathways caused by the infarct.
Step-by-step explanation:
Anterior myocardial infarction (MI) often leads to conduction disturbances within the heart. Among the most common types are the AV nodal and infra-Hisian blocks. AV blocks can be classified by degrees:
- A first-degree block shows a prolonged PR interval on ECG.
- A second-degree block presents as some P waves not followed by QRS complexes, leading to occasional dropped beats.
- A third-degree, or complete block, demonstrates a complete disassociation between P waves and QRS complexes on ECG, where the ventricles beat independently from the atria.