The component of the client's history that would produce such symptoms of heart arrhythmia is Electrocardiogram.
An Electrocardiogram ECG is a test that records your heart's rhythm and electrical activity.
A heart arrhythmia is an irregular heartbeat, which occurs when the electrical signals that coordinate the heart's beats don't work properly.
Thus, the component of the client's history that would produce such symptoms of heart arrhythmia is Electrocardiogram.
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