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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