Zipcodes in Twentynine Palms, CA (San Bernardino County) Cities in San Bernardino County, CA. * Not found in the U.S. Census 2000 data. Location may not be an incorporated place or boundary may be approximate.
About Arrhythmia. An arrhythmia is an abnormal heart rhythm. Learn about the heart's structure and why abnormal heart rhythms may cause problems. Read more.
Types of Heart Arrhythmias. Arrhythmia refers to any kind of abnormal heart rhythm. There are two types of arrhythmias: atrial arrhythmia, also called supraventricular arrhythmia, which begins in the upper chambers of the heart, and ventricular arrhythmia, which begins in the lower chambers of the heart