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Harvard Bipolar Research Program, Consolidated Department of Psychiatry, Harvard Medical School, Boston, MA, USA.
In vivo magnetic resonance spectroscopy (MRS) was used to determine the relationship between serum and brain lithium levels in bipolar patients (n=25). Over the broad range of serum lithium levels observed, the correlation (r=.68) with brain lithium levels was high. This correlation was much weaker (r=.39) when limited to only those patients with serum lithium levels in the range of 0.6-1.0 mmol/l. This variability may account for failure of lithium prophylaxis in some patients who have serum lithium levels in the therapeutic range.