what causes strained muscle around the heart
In time, the strain causes the wall of the left ventricle to thicken (left ventricle hypertrophy). The heart may become weak and eventually suffer heart failure. slide 2 of 7. Causes of a Heart Thickened by a Narrowed Aorta In most patients, aortic stenosis is due to a congenital abnormality of the aortic valve.