Key result
Supratherapeutic lithium is linked to a ~7-fold higher rate of prolonged QTc.
Why the study?
The correlation between serum lithium levels and electrocardiographic changes has never been characterized in a systematic way.
Do ECG abnormalities (QTc >440 ms and diffuse T wave inversion) predict over-range lithium levels in patients undergoing lithium treatment?
Population
76 patients undergoing lithium treatment with available lithium level records
Comparison
Patients with lithium over range (>1.2 mEq/l) vs patients without lithium over range
Design
Retrospective observational study
Authors
Loading...
Retrospective lithium-ECG correlations warrant cautious interpretation; leaves open prospective confirmation of clinical relevance.
Observational (n=76)
Do ECG abnormalities (QTc >440 ms and diffuse T wave inversion) predict over-range lithium levels in patients undergoing lithium treatment?
Absolute Event Rate: 55% vs 8%
p-value: p=<0.001
QTc interval >440 ms and diffuse T wave inversion are highly specific predictors of over-range lithium levels, suggesting routine ECG monitoring could aid in early detection of lithium toxicity.
Hsu et al. (2004) conducted an observational in Manic-depressive illness on lithium treatment (n=76). Lithium over range (>1.2 mEq/l) vs. Lithium levels within range was evaluated on QTc interval >440 ms (p=<0.001). Lithium over range (>1.2 mEq/l) was significantly associated with a higher prevalence of QTc interval >440 ms (55% vs 8%, p<0.001) and diffuse T wave inversion (73% vs 17%, p<0.001).
Synapse has enriched 3 closely related papers on similar clinical questions. Consider them for comparative context: