<prompt> Answer this question truthfullyWhat is the importance of an electrocardiogram ECG in individuals who have De Quervains thyroiditis?  <response>: <reason> The most common EKG finding associated with the thyrotoxicosis in de Quervains thyroiditis is sinus tachycardia. Rarely signs of myocardial damage, including ST-segment elevation and arrhythmias, can also be seen in thyrotoxicosis. 