- Chronic inappropriate tachycardia can lead to dilated cardiomyopathy
- Atrial fibrillation/flutter w/poorly controlled ventricular response
- Other sustained SVT w/poorly controlled ventricular response
- High burden of PVCs or runs of VT
- Inappropriate tachycardia from hyperthyroidism, other endocrinopathy
- Sense of rapid heart rate
- SOB, DOE, PND, orthopnea