the study of the anatomy, normal functions, and disorders of the heart. The medical field dedicated to diagnosing and treating diseases of the heart and cardiovascular system. See Interventional cardiology, Nuclear cardiology.. APC, or atrial premature complex (or beat) is a beat that arise in the atria of the heart from outside the normal mechanism of heartbeats. It's very common and doesn't portend any bad prognosis. It increase with age, smoking, coffee intake, alcohol intake, and stress, and also with heart and lung disease.
A nanometer is a unit of spatial measurement that is 10-9 meter, or one billionth of a meter. It is commonly used in nanotechnology, the building of extremely small machines. This was last updated in September 2005.
1 nanometer, an SI unit of length, equal to 10 â9 m (a billionth of a meter). 2  nm (Unix) , a computer program used as an aid for debugging.  3 never married on matrimonial web sites or newspaper classified ads. 4  nm also refers to nautical miles usually used to define a distance in the aeronautical field.