It is just a general term meaning the heart is not acting normal from time to time. Also known as arrhythmia and irregular heartbeat is any of a large and heterogeneous group of conditions in which there is abnormal electrical activity in the heart. The heartbeat may be too fast or too slow, and may be regular or irregular. A heart beat that is too fast is called tachycardia and a heart beat that is too slow is called bradycardia. It is possible the doctor is seeing your sinus tachycardia as inappropriate sinus tachycardia though you will have to question him as to what he thinks is specifically wrong and if it can be fixed and if so how. But essentially he is determining that there is some sort of an issue going on.
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