PMC8672374_01
Telemetry strip showing repeated self-terminating episodes of TdP with prolonged QT with R-on-T phenomenon with bradycardia.. Abbreviation: TdP, torsades de pointes.
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She was immediately placed on telemetry and was revealed to have several self-terminating episodes of polymorphic ventricular tachycardia (Figure 1).
A 12-lead EKG demonstrating EAD occurring during repolarization or R-on-T phenomenon which occurs during bradycardia.. Abbreviations: EKG, electrocardiogram; EAD, early afterdepolarization.
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The patient's QTc was 529 ms on day 1 with R-on-T phenomenon (Figure 2), which exceeded the normal QTc interval for women of <=450 ms.  
EKG after transvenous pacer is placed, prolonged QTc, but overdrive pacing suppresses ventricular ectopy.. Abbreviation: EKG, electrocardiogram.
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She was then temporarily placed on transcutaneous pacing until a transvenous pacemaker could be placed in the cardiac catheterization lab (Figure 3).