A 64-year-old white woman presented to the emergency department for evaluation of episodic palpitations and chest tightness. On arrival to the emergency department, her symptoms had entirely resolved. A 12-lead electrocardiogram (ECG) was obtained while she was asymptomatic and is shown in Figure 1A. Minutes later, the patient developed recurrence of her symptoms with palpitations, chest tightness, and dyspnea. A 12-lead ECG captured this event and is shown in Figure 1B.
Steyers CM, Bhave PD. The Importance of the Ladder Diagram in the Evaluation of TachyarrhythmiaJumping to Conclusions. JAMA Intern Med. 2014;174(12):2024-2026. doi:10.1001/jamainternmed.2014.5231