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Left ventricular noncompaction is a heart muscle disorder that occurs when the lower left chamber of the heart, which promotes the blood pumping blood, does not develop properly. Instead of the muscle being smooth and firm, the cardiac muscle in the left ventricle's left ventricle is thick and appears spongy. For the heart to pump blood properly, cardiac muscles must contract and relax completely. Some people with left ventricular noncompaction have no signs at all; others have heart problems that can lead to sudden cardiac death. Heart disease affects two-thirds of people with left ventricular dysfunction.
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