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.
Problems with this electrical conduction system can cause an arrhythmia. Arrhythmias can cause the heart to pump less effectively because the coordination of the heart muscle becomes uncoordinated. Certain arrhythmias increase your risk of other medical problems like stroke or blood clots. In an arrhythmia, abnormal electrical signals through the heart muscle may cause the heart to beat too fast, too slow, or in an irregular manner. In any of these situations, the heart may not be able to pump an adequate amount of blood to the body with each beat.