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.
A board, typically with a hole for the thumb, which an artist can hold while painting and on which colors are mixed. 2. a. The range of colors used in a visual medium, in a picture, or by an artist: a limited palette.
A limited edition is normally hand signed and numbered by the artist, typically in pencil, in the form (e.g.): 14/100. The first number is the number of the print itself. The second number is the number of overall prints the artist will print of that image.