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. 2007 Aug;24(8):588–591. doi: 10.1136/emj.2007.047373

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Figure 3 Mean (SD) door‐to‐balloon times (DBT) during regular hours versus off hours for those who arrived via emergency medical services with Cath Alert activation only compared to those with the prehospital electrocardiogram (ECG) along with Cath Alert activation. The addition of the prehospital ECG negated the delay effect of off hour presentation and significantly reduced the DBT.