Occurrence of ventricular ectopics in a patient with therapeutic lithium level.

A young male with bipolar affective disorder, mania with psychotic features was started on lithium therapy. Four days later, he developed an irregular pulse on a lithium level of 0.45 mmol/L. An ECG showed multiple unifocal ventricular ectopics. The cardiac arrhythmia disappeared when lithium was discountinued.