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Mutation in Gene That's Critical for Human Development Linked to Arrhythmia, University of Utah Study  
12/28/2011 7:31:41 AM

Arrhythmia is a potentially life-threatening problem with the rate or rhythm of the heartbeat, causing it to go too fast, too slow or to beat irregularly. Arrhythmia affects millions of people worldwide. The cardiac conduction system (CCS) regulates the rate and rhythm of the heart. It is a group of specialized cells in the walls of the heart. These cells control the heart rate by sending electrical signals from the sinoatrial node in the heart's right atrium (upper chamber) to the ventricles (lower chambers), causing them to contract and pump blood.
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