The ECG in the figure below:
is suggestive of:
This electrocardiogram shows a sinus rhythm. There is a first-degree AV block and intermittent 2:1 block. In addition, there is STsegment depression that is scooping in quality in the lateral leads. This is an example of digitalis excess with intermittent second-degree AV block and digitalis effect.
ECG changes:
shows:
Right Bundle Branch Block (RBBB), complete. This patient has a right bundle branch block and left axis deviation. He also has pauses. In this case, the P waves are regular and the PR intervals do not change. This is an example of a Mobitz type II seconddegree AV block. The P-wave vectors are prominent in both leads II and V1 , suggesting left atrial enlargement.
ECG shows:
Blocked Atrial premature beats (nonconducted). This patient has a right bundle branch block. There is also left axis deviation which probably is enough to qualify as an anterior hemiblock. There are occasional pauses. In this case, the pauses are preceded by P waves, which are within the preceding T waves, and so this is an example of blocked Premature Atrial Contractions (PACs) and not an example of more advanced AV block associated with bifascicular block.
Acute Inferior Infarction with 2:1 AV block. This patient shows a sinus rhythm with a 2:1 AV block. This can either be a Mobitz type I or II AV block. It is impossible to tell which. This also shows ST-segment elevation with Q waves in the inferior leads with reciprocal changes in leads I and aVL and is an example of an acute inferior infarction with 2:1 AV block.
This patient shows a sinus rhythm. There is ST elevation in the inferior leads, especially leads III and aVF. There are reciprocal depressions in leads I and aVL. In leads V1 and V2 , there is also ST elevation. This is an acute inferior infarction plus acute right ventricular infarct.
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