A answered. Atrial fibrillation can be caused by a number of different things that predispose the heart to arrhythmias. Most commonly, longstanding high blood pressure is the cause. Other causes include heart disease such as blockage in the coronary vessels or diseases such as pneumonia or COPD.
Definition: When an artist deliberately restricts the number of colors they use in a painting, they're said to be using a limited palette. (A palette being what paints are squeezed out onto, ready for use.). Also Known As: Restricted palette.
Definitions of fine art photography on photographers' static Web pages vary from the subset of fine art that is created with a camera to limited-reproduction photography, using materials and techniques that will outlive the artist.