Is QTc prolongation in poisoned patients associated with an increased risk of death?

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Why is this study important?

Poisonings are common emergency department (ED) presentations and the electrocardiogram (ECG) is considered a standard screening and diagnostic test for these patients. Very few studies have examined the prognostic value of a prolonged QT interval in poisoned patients. This multi-center database review attempts to determine the risk of death with a prolonged QT interval on the ECG at ED presentation.

Which, if any, threats to validity are most likely to have an impact on the results and how?

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