Original
The worst symptoms of Inappropriate Sinus Tachycardia tend to be the following:
* Sinus Tachycardia (Fast, rhythmic heart rate)
* Palpitations (Sensation of feeling your heartbeat)
* Chest Pain
* Dizziness
While this is not an exhaustive list, the above symptoms tend to be the ones that cause the most disruption of day-to-day life and disturbance of the patient.