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  2. Arrhythmia - Wikipedia

    en.wikipedia.org/wiki/Arrhythmia

    Each heartbeat originates as an electrical impulse from a small area of tissue in the right atrium of the heart called the sinus node or sinoatrial node (SA node). The impulse initially causes both atria to contract, then activates the atrioventricular node (AV node) , which is normally the only electrical connection between the atria and the ...

  3. Palpitations - Wikipedia

    en.wikipedia.org/wiki/Palpitations

    Palpitations are perceived abnormalities of the heartbeat characterized by awareness of cardiac muscle contractions in the chest, which is further characterized by the hard, fast and/or irregular beatings of the heart. [1] Symptoms include a rapid pulsation, an abnormally rapid or irregular beating of the heart. [1]

  4. Cardiac cycle - Wikipedia

    en.wikipedia.org/wiki/Cardiac_cycle

    The heart is a four-chambered organ consisting of right and left halves, called the right heart and the left heart. The upper two chambers, the left and right atria , are entry points into the heart for blood-flow returning from the circulatory system , while the two lower chambers, the left and right ventricles , perform the contractions that ...

  5. Irregular heartbeat types, symptoms and causes - AOL

    www.aol.com/news/irregular-heartbeat-signs...

    Don't panic, symptoms can be caused by stress, and most people who do have abnormal heart rhythms are able to live normal lives, but here's what to be aware of. Irregular heartbeat types, symptoms ...

  6. Sinoatrial node - Wikipedia

    en.wikipedia.org/wiki/Sinoatrial_node

    Sinus node dysfunction also known as sick sinus syndrome is a group of irregular heartbeat conditions caused by faulty electrical signals of the heart. When the heart's sinoatrial node is defective, the heart's rhythms become abnormal—typically too slow or exhibiting pauses in its function or a combination, and very rarely faster than normal ...

  7. Premature heart beat - Wikipedia

    en.wikipedia.org/wiki/Premature_heart_beat

    A premature heart beat or extrasystole [1] is a heart rhythm disorder corresponding to a premature contraction of one of the chambers of the heart. Premature heart beats come in two different types: premature atrial contractions and premature ventricular contractions. Often they cause no symptoms but may present with fluttering in the chest or ...

  8. Tachycardia-induced cardiomyopathy - Wikipedia

    en.wikipedia.org/wiki/Tachycardia-induced_cardio...

    People with TIC most often present with symptoms of congestive heart failure and/or symptoms related to their irregular heart rhythm. [1] Symptoms of congestive heart failure can include shortness of breath, ankle swelling, fatigue, and weight gain. [2] Symptoms of an irregular heart rhythm can include palpitations and chest discomfort. [2]

  9. Sinus arrhythmia - Wikipedia

    en.wikipedia.org/wiki/Sinus_arrhythmia

    During respiration, the intermittent vagus nerve activation occurs, which results in beat to beat variations in the resting heart rate. During inspiration vagal tone is slowed down and the heart rate goes up (being maximal at the peak of inspiration), while during expiration vagal tone is increased and heart rate decreases, being slowest at end-expiration.

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