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  2. Heart block - Wikipedia

    en.wikipedia.org/wiki/Heart_block

    SA blocks rarely give severe symptoms, because even if an individual had complete block at this level of the conduction system (which is uncommon), the secondary pacemaker of the heart would be at the AV node, which would fire at 40 to 60 beats a minute, which is enough to retain consciousness in the resting state. However SA block is capable ...

  3. The Common Issue for People Over 50 That’s a ... - AOL

    www.aol.com/lifestyle/common-issue-people-over...

    Heart disease is terrifying, especially as it's the number one cause of death in the U.S. About 1 in 20 people who are 20 years old or older are living with it.. At doctor’s visits, your ...

  4. 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.

  5. Third-degree atrioventricular block - Wikipedia

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

    The cause of congenital third-degree heart block in many patients is unknown. Studies suggest that the prevalence of congenital third-degree heart block is between 1 in 15,000 and 1 in 22,000 live births. [citation needed] Hyperkalemia in those with previous cardiac disease [8] and Lyme disease can also result in third-degree heart block. [9]

  6. Coronary occlusion - Wikipedia

    en.wikipedia.org/wiki/Coronary_occlusion

    Symptoms include chest pain or angina, shortness of breath, and fatigue. [6]A completely blocked coronary artery will cause a heart attack. [6] Common heart attack symptoms include chest pain or angina, pain or discomfort that spreads to the shoulder, arm, back, neck jaw, teeth or the upper belly, cold sweats, fatigue, heartburn, nausea, shortness of breath, or lightheadedness.

  7. Cannon A waves - Wikipedia

    en.wikipedia.org/wiki/Cannon_A_waves

    Cannon A wave. Cannon A waves, or cannon atrial waves, are waves seen occasionally in the jugular vein of humans with certain cardiac arrhythmias.When the atria and ventricles happen to contract simultaneously, the right atrium contracts against a closed tricuspid valve, resulting in back pressure into the venous system that can be seen in the jugular venous pulse as a high-amplitude "cannon ...

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