Arrhythmias are abnormalities of the heart rate and rhythm, and they can be divided in two categories: fast and slow heart rates. Some cause few or minimal symptoms. Others produce more serious symptoms of silliness, vertigo, dizziness, and fainting.
Some people with normal hearts can have abnormal electrical pathways in their hearts, that cause arrhythmias. People with underlying problems in the function and structure of the heart, have tendency to heart rhythm problems. People who have had successful heart surgery live longer; but doctors are diagnosing more heart rhythm abnormalities.
A heart rhythm abnormality is evaluated in ways much like those used to evaluate other health problems.
There are several tests to diagnose an arrhythmia. Some are usually an electrocardiogram; an ECG machine records your heart's electrical activity. The tracings can be recorded. Electrocardiograms are only a brief snapshot of your heart rhythm and may not detect the actual arrhythmia.