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.
For example: 1  Ischaemic heart disease (which causes angina and heart attacks). 2  Heart valve diseases can cause the heart muscle to enlarge which can trigger abnormal electrical activity. 3  High blood pressure (hypertension) can put strain on the heart and cause arrhythmias.