A 55-Year-Old Woman with Shortness of Breath and a Rapid Heart Rate
BACKGROUND
A 55-year-old woman presents to the emergency department (ED) with severe, progressive shortness of breath, with associated chest pressure and wheezing. She has labored respirations and is unable to speak in full sentences; she also has a 40-pack-year history of tobacco use, as well as a history of alcoholism. She used her albuterol inhaler before contacting emergency medical services (EMS), but there was no relief of her symptoms. An electrocardiogram (ECG) is performed, and it shows tachycardia at 152 bpm, with a left bundle branch block.
What is the rhythm demonstrated on the ECG?
(HINT :The rhythm can sometimes be difficult to differentiate from a supraventricular tachycardia. )
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