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2. Heart block - Wikipedia

   en.wikipedia.org/wiki/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 .

3. Atrioventricular block - Wikipedia

   en.wikipedia.org/wiki/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.

4. What Is Heart Disease? Everything You Need to Know - AOL

   www.aol.com/heart-disease-everything-know...

   A heart attack, or myocardial infarction, occurs when blood flow to the heart is suddenly blocked. This medical emergency is often the result of coronary artery disease.

5. 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.

6. What are cardiac arrest, heart attack and heart failure? - AOL

   www.aol.com/cardiac-arrest-heart-attack-heart...

   Heart disease is a leading killer around the world and the top cause of death in the United States. ... When circulation is blocked or cut off in some way and blood is no longer supplied to the ...

7. First-degree atrioventricular block - Wikipedia

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

   First degree AV block does not generally cause any symptoms, but may progress to more severe forms of heart block such as second- and third-degree atrioventricular block. It is diagnosed using an electrocardiogram, and is defined as a PR interval greater than 200 milliseconds. [1]