During exercise testing, the appearance of dangerous arrhythmias is an absolute contraindication. Which option best describes this condition?

During exercise testing, the appearance of dangerous arrhythmias is an absolute contraindication. Which option best describes this condition?

• A. Occasional premature beats at rest.
• B. Non-sustained ventricular tachycardia during testing.
• C. Presence of dangerous arrhythmias.
• D. Mild sinus tachycardia with exertion.

Answer: (C)

The key idea is safety: dangerous arrhythmias during exercise testing require stopping the test because continuing could lead to life-threatening events. When such arrhythmias appear—examples include sustained ventricular tachycardia, ventricular fibrillation, or other rhythms that cause hemodynamic instability—the risk of sudden deterioration is too high, so the test is immediately contraindicated to proceed. Occasional premature beats at rest are typically benign and don’t justify stopping. Non-sustained ventricular tachycardia during testing can raise concern but isn’t an automatic absolute ban in every case, depending on context. Mild sinus tachycardia with exertion is a normal, expected response to exercise. Therefore, the description that best matches an absolute contraindication is the presence of dangerous arrhythmias.

The key idea is safety: dangerous arrhythmias during exercise testing require stopping the test because continuing could lead to life-threatening events. When such arrhythmias appear—examples include sustained ventricular tachycardia, ventricular fibrillation, or other rhythms that cause hemodynamic instability—the risk of sudden deterioration is too high, so the test is immediately contraindicated to proceed.

Occasional premature beats at rest are typically benign and don’t justify stopping. Non-sustained ventricular tachycardia during testing can raise concern but isn’t an automatic absolute ban in every case, depending on context. Mild sinus tachycardia with exertion is a normal, expected response to exercise. Therefore, the description that best matches an absolute contraindication is the presence of dangerous arrhythmias.