A patient with hypothyroidism may develop a number of changes in the electrocardiogram that reflect the decrease in metabolic and sympathetic activity.
ECG Changes:
(1) sinus bradycardia
(2) prolonged QT interval
(3) T waves that are flat or inverted without ST segment deviation
(4) heart block and intraventricular conduction defects
(5) low voltage waveforms, especially QRS complexes
(6) ventricular extrasystoles
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