Inferior wall MI is caused by occlusion of the right coronary artery (RCA). This type of infarction is manifested by ECG changes in leads II, III, and aVF (See image below).
Conduction abnormalities are expected with an inferior wall MI and are r/t the anatomy of the coronary arterial circulation supply. The RCA perfuses the sinoatrial (SA) node in slightly more than 50% of the population, supplies the proximal bundle of His and atrioventricular (AV) node in more than 90% of individuals, heart block and other conduction disturbances should be anticipated.
Inferior wall infarction has a mortality rate of about 6%. If the right ventricle is involved, the mortality rate rises to 25% to 30%.
The images below show changes seen on a 12-lead ECG with an inferior wall MI. A. Infarction location on cardiac wall.
B. ECG leads with expected ST-segment elevation.
C. A 12-lead ECG from a patient experiencing inferior wall MI.
B. ECG leads with expected ST-segment elevation.
C. A 12-lead ECG from a patient experiencing inferior wall MI.
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