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Left atrial enlargement (LAE) or left atrial dilation refers to enlargement of the left atrium (LA) of the heart, and is a form of cardiomegaly. Signs and symptoms
In heart failure, the heart muscle weakens, and the ventricles stretch (dilate) to the point that the heart can't pump blood efficiently throughout the body. Blood clots: If clots enter the bloodstream, they can block blood flow to vital organs, possibly causing a heart attack or stroke.
Dilated cardiomyopathy (DCM) is a condition in which the heart becomes enlarged and cannot pump blood effectively. [3] Symptoms vary from none to feeling tired, leg swelling , and shortness of breath . [ 2 ]
There is myocardial necrosis (cell death) and disproportionate thinning of the heart. This thin, weakened area is unable to withstand the pressure and volume load on the heart in the same manner as the other healthy tissue. As a result, there is dilatation of the chamber arising from the infarct region.
The contrasting phase is systole when the heart chambers are contracting. Atrial diastole is the relaxing of the atria, and ventricular diastole the relaxing of the ventricles. The term originates from the Greek word διαστολή (diastolē), meaning "dilation", [1] from διά (diá, "apart") + στέλλειν (stéllein, "to send").
Dilated cardiomyopathy (DCM) – Cardiomyopathy caused by dilation of the heart, typically caused by "drugs and bugs." It is the most common form of non-ischemic cardiomyopathy and the dilatation of the heart results in larger chamber volumes & thinner myocardial walls, both of which decrease the ability to pump.