1. ST depression is a sign of myocardial ischemia
i.e. reduced coronary perfusion i.e. Ischemic heart Disease
2. but since tachycardia was there along with nervousness both these conditions (sinus tachycardia + CNS) can lead to non- ischemic ST depression.
3. hopefully your tech or attending Physician have ruled out other possibility of ST depression: hypokalemia,hypocalcemia, Right or Left Ventricular Hypertrophy
,or due to side effect of medication.
4. Have an appointment with your physician or consider a second Opinion
5. probably TMT (stress ecg)/Echo will be helpful.
6. In Patients with pre existing heart disease receiving Thyroxine there is chest pain and increased heart rate
, so check with the dosage.
7. treatment will rest upon the diagnosis.