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2. Heart block - Wikipedia

   en.wikipedia.org/wiki/Heart_block

   Heart block. Heart block ( HB) [ 1] is a disorder in the heart 's rhythm due to a fault in the natural pacemaker. [ 2] This is caused by an obstruction – a block – in the electrical conduction system of the heart. Sometimes a disorder can be inherited. Despite the severe-sounding name, heart block may cause no symptoms at all in some cases ...

3. Atrioventricular block - Wikipedia

   en.wikipedia.org/wiki/Atrioventricular_block

   Atrioventricular block. Atrioventricular block ( AV block) is a type of heart block that occurs when the electrical signal traveling from the atria, or the upper chambers of the heart, to ventricles, or the lower chambers of the heart, is impaired. Normally, the sinoatrial node (SA node) produces an electrical signal to control the heart rate.

4. Second-degree atrioventricular block - Wikipedia

   en.wikipedia.org/wiki/Second-degree_atrio...

   Second-degree atrioventricular block (AV block) is a disease of the electrical conduction system of the heart.It is a conduction block between the atria and ventricles.The presence of second-degree AV block is diagnosed when one or more (but not all) of the atrial impulses fail to conduct to the ventricles due to impaired conduction.

5. Cardiac nurse, 22, had chest pains on duty — turns out she ...

   www.aol.com/cardiac-nurse-22-had-chest-221439779...

   A heart block occurs when something prevents the heart’s electrical system, also known as the conduction system, from working correctly, says Dr. Robert Kowal, a cardiac electrophysiologist and ...

6. First-degree atrioventricular block - Wikipedia

   en.wikipedia.org/wiki/First-degree_atrio...

   First-degree atrioventricular block (AV block) is a disease of the electrical conduction system of the heart in which electrical impulses conduct from the cardiac atria to the ventricles through the atrioventricular node (AV node) more slowly than normal. First degree AV block does not generally cause any symptoms, but may progress to more ...

7. Researchers identify heart block cause in athletes - AOL

   www.aol.com/researchers-identify-heart-block...

   While heart block is benign for most people, it can be a precursor to more serious heart problems.