Sinus bradycardia pathophysiology

Sinus bradycardia Microchapters
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor-In-Chief: Cafer Zorkun, M.D., Ph.D. [2]

Pathophysiology

This rhythm may be caused by one of the following:

• Increased vagal tone
• Intrinsic disease of the SA node
• An effect of drugs, such as the use of digitalis or beta-blockers
• Sleep
• Sinus bradycardia is a normal finding in a healthy, well-conditioned athlete

The HCN4 genetic variant is associated with sinus bradycardia. Certain sodium channelopathies are associated with sinus bradycardia.

References

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