A patient with hyperthyroidism may develop a number of changes in the electrocardiogram that reflect the increase in metabolic and sympathetic activity.
ECG Changes:
(1) sinus tachycardia
(2) shortening of the QT interval, while the QTc interval may be prolonged
(3) nonspecific changes in ST and T waves
(4) atrial fibrillation or other supraventricular arrhythmias (premature atrial beats, paroxysmal supraventricular tachycardia, multifocal atrial tachycardia, atrial flutter)
(5) increased voltage in all waveforms, especially QRS complexes (simulates right atrial and left ventricular enlargement)
(6) ventricular extrasystoles
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