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.
Figure 100 â ECG demonstrating premature atrial contractions. Discussion. A cardiac arrhythmia or dysrhythmia is an abnormality in the cardiac muscle contraction or variation in the normal rhythm. This includes rhythm loss, irregular rhythms or abnormal regular rhythms.