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Genetic Cause for Atrial Fibrillation Found

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Doctors have found that some cases of atrial fibrillation may be due to a genetic defect.  
 
Atrial fibrillation is a fairly common type of irregular heartbeat which affects the upper heart chambers. It is not immediately deadly but does raise the risk of stroke due to blood clots. 
 
The gene, found only in heart cells, makes a certain protein, connexin 40, which is necessary for the heart's electrical conductivity. 
 
The finding could lead to treatments for these cases.

Mutant Gene May Help Cause Abnormal Heartbeat

Forbes - 6/21/2006 6:14 PM

WEDNESDAY, June 21 (HealthDay News) -- A genetic flaw may help trigger atrial fibrillation, the dangerous abnormal heartbeat whose cause has long remained a mystery.
 
Canadian researchers say mutations in a gene for a protein called connexin 40, which transmits the electrical signals that keep the heart beating normally, were found in 4 of 15 patients with atrial fibrillation classified as "idiopathic" -- meaning no specific cause could be found
 
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