By Andrew Zimmerman Jones. Definition: Dark matter is a hypothesized form of matter particle that does not reflect or emit electromagnetic radiation. The existence of dark matter is inferred from gravitational effects on visible matter, such as stars and galaxies.
An enlarged heart is medically known as cardiomegaly. Cardiomegaly can be caused by a number of different conditions, including diseases of the heart muscle or heart valves, high blood pressure, arrhythmias, and pulmonary hypertension.t is important to remember that an enlarged heart is not a disease itself but a physical sign that can accompany many diseases and conditions. Not all of the associated conditions listed below, however, will always result in cardiomegaly. Treatment and prognosis are dependent upon the underlying cause.
Heart Palpitations. A heart palpitation is the sensation that your heart has skipped a beat or added an extra beat. It may feel like your heart is racing, pounding, or fluttering. You may become overly aware of your heartbeat. This sensation is sometimes also felt in the neck, throat, or chest.While you are having palpitations, your heart rhythm may or may not be abnormal. Heart palpitations can be caused by a variety of factors, including caffeine, exercise, smoking, or stress.Although they can be quite unsettling, most heart palpitations are harmless and resolve on their own without treatment.ou may become overly aware of your heartbeat. This sensation is sometimes also felt in the neck, throat, or chest. While you are having palpitations, your heart rhythm may or may not be abnormal. Heart palpitations can be caused by a variety of factors, including caffeine, exercise, smoking, or stress.