Scenario: This single-lead II rhythm strip was obtained from a 70-year-old woman during an exercise stress test done as part of screening for participation in a research trial. Her medical conditions included being overweight (body mass index [weight in kilograms divided by height in meters squared], 28.8), pharmacologically managed hypertension, and hypercholesterolemia. To be eligible to participate in the research trial, the patient had to complete a recumbent bike exercise stress test to demonstrate that she could exercise safely. The 10-second strip shown below was her electrocardiogram (ECG) during peak exercise. Although the patient was asymptomatic during this rhythm, do you think it is safe for her to exercise without further medical evaluation?

Normal sinus rhythm at 80/min with a sudden onset of supraventricular tachycardia (SVT) at 150/min induced by exercise stress test.

Supraventriculat tachycardias are a category of cardiac rhythms...

You do not currently have access to this content.