Bpm: beat per minute, SBP: Systolic blood pressure, DBP: Diastolic blood pressure

During performing stress echocardiography, all subjects completed stress test in view of reaching at least 90% of maximum predicted heart rate, and no one had developed evidence of ischemia in echocardiography or ECG. About 7 patients (26.9%) reported mild dyspnea at peak stress that was not restricting for exercise and no one had typical chest pain and dizziness. No significant ST-T change and arrhythmia were induced.

For evaluation of diastolic function reserve, according to the mentioned criteria in previous section, no one had developed criteria of diastolic dysfunction in stress echocardiography and mean E/e’ ratio and TR velocity were 7.25 ± 1.4 and 2.6(2.39-2.88), respectively. There was also no significant difference between the two groups. (Table-3)

Table -3. Comparison of echocardiographic diastolic parameters at maximal exercise between the hyperthyroid and control groups.