Diagnosing And Treating An Atrial Septal Defect
Your heart’s left and right sides are separated by an inner wall of tissue called the septum. This wall helps to prevent oxygen-poor blood on the right side from mixing with oxygen-rich blood on the left side. If the portion of the wall that separates the atria has a [...]

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Overview Of Heart Block: Abnormalities Of The Electrical System
The rhythm of your heartbeat is determined by the electrical impulses generated by your sinoatrial node. These impulses start in the two upper chambers (i.e. atria) and work downward through the two lower chambers (i.e. ventricles). As they travel downward, they cause contractions in your atria and [...]

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