Lithium is used for the treatment of bipolar disease (manic depressive disorder).

ECG abnormalities that may be seen frequently in patients with lithium intoxication

  Sinoatrial block

  Sinus bradycardia

T wave abnormalities: Negative, biphasic or flattened T waves

ECG abnormalities that may also be seen (albeit less frequently) during lithium intoxication

  Prolonged QT interval

  First degree AV block

  Brugada pattern

  Supraventricular tachycardia

  Ventricular tachycardia

References (with links to full text and sample ECGs)

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