Embolism Hemorrhage Pacemaker 
EMS 12-Lead
MARCH 30, 2024
This is demonstrated ( Figure 5 ) by the gap in arrows at the bottom of the strip, signifying that the demand pacemaker has recognized an underlying rhythm (in this case, artifact from a moving ambulance). The artifact fools the pacemaker into thinking the rhythm is native. On ED arrival ROSC is achieved.
Dr. Smith's ECG Blog
APRIL 8, 2015
Also consider non-hemorrhagic volume depletion, dehydration : orthostatic vitals may uncover this [see Mendu et al. (3)]. Family history of sudden death at age less than 40 Negative predictors : pacemaker, pre- or near- syncope only Workup (Smith opinion from literature) Always evaluate with: 1. Syncope with Exertion (EGSYS) 7.
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