Types of Myocardial Infarction

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Questions and Answers

What are the two major types of MI based on gross inspection?

Transmural infarcts and subendocardial infarcts

What is the difference between transmural infarcts and subendocardial infarcts?

Transmural infarcts involve the full thickness of the ventricular wall, while subendocardial infarcts involve the subendocardium or intra-mural myocardium without extending all the way through the ventricular wall.

In which type of infarction is occlusive coronary thrombosis more common?

Transmural infarction

Under what conditions do nontransmural infarctions frequently occur?

Nontransmural infarctions frequently occur in the presence of severely narrowed but still patent coronary arteries, with sufficient collateral circulation, or if the artery is only transiently occluded. Signup and view all the answers

How may patchy nontransmural MI arise?

Patchy nontransmural MI may arise secondary to fibrinolysis or PCI of an originally occlusive thrombus, with restoration of blood flow before the wavefront of necrosis has extended from the subendocardium across the full thickness of the ventricular wall. Signup and view all the answers

What is the key factor that determines the extent and type of MI?

The extent and type of MI are determined by factors such as the presence of collateral circulation, the patency of coronary arteries, and the duration of occlusion. Signup and view all the answers

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