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.
Other Art Definitions. A blank canvas can refer to artistic supplies other than canvas that have not yet been filled with art. For example, a piece of paper could be considered a blank canvas for a writer or poet and a roll of photographic film is a blank canvas for a photographer.