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If there is the same distance between each P wave it is regular. If the distances between the P waves varies it is irregular. Also, in a regular rhythm all the P waves should look the same.
Atrial fibrillation
Atrial fibrillation is an irregular heartbeat. Atrial fibrillation has been linked to heart disease and evidence suggests it may be hereditary. Taking measures to lower your heart disease risk are advised. Specifically, don't smoke, get regular exercise and have a healthy diet.
"atrial fibrillation" is the irregular quivering action of the atria, which in turn, may cause "palpitations" (the awareness of an irregular heartbeat) and/or "tachycardia" (rapid heartbeat).
If you hear a heart mumur, this indicates heart valve disease. If the heart rate is irregular it is either atrial fibrillation or ectopic beats, either atrial or ventricular.
the heart beat is completely irregular. The atrial muscles contract very quickly and irregularly; the ventricles, the heart's two large lower chambers, beat irregularly but not as fast as the atria
Tachycardia
Decreased Cardiac Output as evidenced by irregular heart beat, decreased ejection fraction and generalied edema.
It is called Atrial Fibrillation
Could be a supraventriculat tachycardia or atrial flutter.
A doctor can detect an irregular heartbeat during a physical exam by taking your pulse, listening to your heartbeat or by performing diagnostic tests.
If you have atrial fibrillation that is not well-controlled (i.e. the medication is not working), this can lead to some of the symptoms you describe due to a fast heart rate, which causes the heart to not work efficiently. The symptoms can be due to the atrial fibrillation itself or another underlying heart problem that led to the atrial fibrillation. I would suggest talking with your doctor about your symptoms and to discuss whether additional therapy is necessary for your atrial fibrillation-there are many options to treat this disorder. He or she can also determine if additional testing is warranted.