Some nebulae create their own light, which sometimes has a fluorescent appearance, while others only reflect the light from nearby stars. Nebulae are often seen around dying stars, and it's thought they may be a natural process that occurs when a star is nearing the end of its life. Nebulae resemble thin clouds that have less atoms per cubic inch than a cloud of smoke.
Cardiomyopathy is a group of diseases that affect the heart muscle. Early on there may be few or no symptoms. Some people may have shortness of breath, feel tired, or have swelling of the legs due to heart failure. An irregular heart beat may occur as well as fainting.
During a heart attack, heart muscle cells die due to lack of oxygen. Cardiac enzymes from the dying cells leak into the bloodstream. In addition to a heart attack, other cardiac diseases that can cause elevated cardiac enzymes include: -- heart failure, or weakness of the heart muscle. -- inflammation of the sac surrounding the heart, or pericarditis. -- inflammation of the heart muscle, or myocarditis.