Myocardium is the muscular substance of the HEART. (See also MUSCLE.)
The middle, muscular layer of the heart.
n. the middle of the three layers forming the wall of the heart (see also endocardium; epicardium). It is composed of *cardiac muscle and forms the greater part of the heart wall, being thicker in the ventricles than in the atria. —myocardial adj.
an area of heart muscle subject to critical coronary ischaemia sufficient to cause reversible impairment of function but insufficient to result in death of the muscle. Also known as viable myocardium, it is detected by MRI scanning of the heart. The clinical importance is that restoration of normal coronary blood flow may improve heart muscle contraction.... hibernating myocardium
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