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.
An arrhythmia is an abnormality in the timing or pattern of the heartbeat. When you have an arrhythmia, your heart may beat too quickly or too slowly, or you may experience an irregular rhythm in which your heart feels as if it is skipping a beat.. Some types of arrhythmia may not be serious.