Dynamics of myocardial infarction--the role of critical closing pressure

Area of Science:

• Cardiovascular physiology
• Pathophysiology of myocardial infarction

Background:

• Normally, heart vessel pressure prevents critical closure of smaller vessels.
• Reduced pressure can occur with acute occlusion or cardiac overactivity impacting major supply vessels.

Purpose of the Study:

• To propose a mechanism for myocardial infarction based on critical closure and vasospasm.
• To explain the role of transmural pressure in coronary artery networks.

Main Methods:

• Theoretical postulation of a physiological mechanism.
• Analysis of pressure dynamics in the coronary arterial network.

Main Results:

• Acute occlusion or overactivity can reduce transmural pressure in parts of the coronary network.
• Reduced pressure may lead to critical closure and subsequent vasospasm.
• Vasospasm is postulated as the basis for myocardial infarction.

Conclusions:

• Critical closure of coronary vessels due to reduced transmural pressure is a potential cause of myocardial infarction.
• Vasospasm, resulting from critical closure, is proposed as the primary mechanism.
• Maximal dilation of unaffected vessels occurs concurrently.