ECG abnormalities that are more frequent in patients with hyperthyroidism

  Sinus tachycardia

  Increased voltage, especially in the young

  Supraventricular arrhythmias : atrial fibrillation (most common), atrial flutter

  Left anterior fascicular block

  Atrial premature systole (APS), ventricular premature systole (VPS)

  Non-specific ST segment and T wave changes

  Any type of atriventricular block (less common)



  In patients with atrial fibrillation, it is more difficult to control high ventricular rate if the patient also has accompanying hyperthyroidism.



References

  JAMA 1970;212:2117-2119.

  J R Soc Med 2001;94:346-348.

  Emerg Med Clin N Am 2006;24:145-157.