why is the endocardium spared in a subendocardium infarct ?

[voicesinmyhead]

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why is the endocardium spared in angina (MC lesion is a subendocardial infarct) ?

if the subendocarium is affected, shouldn't the endocardium be also affected, as endocardium is even farther from the epicardial blood vessels than the subendocardium is.

Also approx only 10% of endocardium derives blood supply directly from chamber blood or so i read.

Any input?

thanks

 

[pd1112]

why is the endocardium spared in angina (MC lesion is a subendocardial infarct) ?

if the subendocarium is affected, shouldn't the endocardium be also affected, as endocardium is even farther from the epicardial blood vessels than the subendocardium is.

Also approx only 10% of endocardium derives blood supply directly from chamber blood or so i read.

Any input?

thanks

Endocardium is epithelial tissue & doesn't require the amount of oxygen that ventricular myocytes do. The oxygen that diffuses from the blood in the chambers is initially enough to meet the requirements of the endocardium & a narrow rim of subendocardial myocardium in the event of an intramural or epicardial occlusion.

 

[voicesinmyhead]

thanks for the reply.

Just wondering why this site mentions that only 10% of endocardium is from chamber blood.? wrong?

 

[pd1112]

thanks for the reply.

Just wondering why this site mentions that only 10% of endocardium is from chamber blood.? wrong?

That 10% is more than the 0% supplying the rest of the wall when the epicardial/intramural vessels are infarcted.