This is my first medical post!
Angina pectoris and myocardial infarction are two serious diseases that are most commonly interchanged. Early recognition of angina pectoris may prevent the condition from developing into myocardial infarction.
In AP, there is pain due to decreased blood and oxygen supply to the heart. Heart tissue goes back to normal when there is enough oxygen supply.
There are stable and unstable angina. Unstable angina can lead to myocardial infarction (these two are known as acute coronary syndrome).
In MI, the tissue actually dies. Heart tissue never return to normal even oxygen is restored. However, there are ischemic part of tissue which there is low oxygen supply, not died tissue. So we can save those "sick" tissue by reperfusion (open those arteries) as soon as possible.
In few words, AP, reversible. MI, irreversible, died tissue.
References:
http://www.sh.lsuhsc.edu/fammed/OutpatientManual/Angina.htm
http://www.earlysymptoms.net/blog/myocardial-infarction-vs-angina-pectoris/
http://www.123angina.com/angina-pectoris/what-is-the-difference-between-angina-pectoris-and-myocardial-infarction-2
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