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.
Triadic: palette based on the full range of colors around the wheel. Monochromatic: dominant use of one hue. Analogous: use of colors next to each other on the color wheel. Complementary: use of colors limited to those that are opposite each other.