By Neil P. Hines Heart conditions are certainly among the most worrisome maladies, and sadly they are also some of the most common in the developed world. A healthy heart has a regular rhythm, and will beat at approximately 60 to 100 beats a minute when at rest. The presence of atrial fibrilation means that the heart's rhythm becomes irregular. This is sometimes accompanied by its beat pattern becoming abnormally fast (known as palpitations). This impaired functioning of the heart can lead to...