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2. Premature atrial contraction - Wikipedia

   en.wikipedia.org/wiki/Premature_atrial_contraction

   Premature atrial contractions are often benign, requiring no treatment. Occasionally, the patient having the PAC will find these symptoms bothersome, in which case the doctor may treat the PACs. Sometimes the PACs can indicate heart disease or an increased risk for other cardiac arrhythmias .

3. Bigeminy - Wikipedia

   en.wikipedia.org/wiki/Bigeminy

   When the atrial rhythm is irregular (as in atrial fibrillation or sinus arrhythmia) the presence of bigeminy depends on the length of the P–P interval and happens more frequently with a longer interval. As with post PVC pauses, a longer P–P interval leads to a higher chance of re-entrant circuits and thus PVCs.

4. Wandering atrial pacemaker - Wikipedia

   en.wikipedia.org/wiki/Wandering_atrial_pacemaker

   Wandering atrial pacemaker may be seen in young, healthy individuals as well as in the elderly and those with lung disease. [2] The cause of wandering atrial pacemaker is unclear. Increased tone from the vagus nerve may factor into the rhythm appearing in young, healthy individuals who exercise. The vagus nerve is a part of the parasympathetic ...

5. Normal Heart Rate for Elderly: What You Need to Know - AOL

   www.aol.com/normal-heart-rate-elderly-know...

   This stress response can be useful in times of imminent danger, but when it happens frequently it may lead to a number of health concerns, including an irregular heart rate and rhythm, which ...

6. Arrhythmia - Wikipedia

   en.wikipedia.org/wiki/Arrhythmia

   Atrial fibrillation affects the upper chambers of the heart, known as the atria. Atrial fibrillation may be due to serious underlying medical conditions and should be evaluated by a physician. It is not typically a medical emergency. Ventricular fibrillation occurs in the ventricles (lower chambers) of the heart; it is always a medical emergency.

7. Supraventricular tachycardia - Wikipedia

   en.wikipedia.org/wiki/Supraventricular_tachycardia

   This rhythm is most commonly seen in elderly people with COPD. [20] Atrial fibrillation: Red dots show atrial fibrillation activity. Atrial fibrillation meets the definition of SVT when associated with a ventricular response greater than 100 beats per minute. It is characterized as an "irregularly, irregular rhythm" both in its atrial and ...