Sustained ventricular tachycardia during a Symptom-Limited Test is particularly concerning because it increases risk of which outcome?

Sustained ventricular tachycardia during a Symptom-Limited Test is particularly concerning because it increases risk of which outcome?

• A. Syncope due to fainting.
• B. Myocardial necrosis.
• C. Sudden cardiac arrest.
• D. Chronic heart failure.

Answer: (C)

Sustained ventricular tachycardia during exercise reveals a highly unstable electrical electrical substrate in the ventricles and indicates the heart may not be able to supply adequate blood flow during stress. When this rapid rhythm persists, cardiac output can drop quickly, leading to dangerous hemodynamic compromise. If the rhythm worsens or degenerates, it can trigger ventricular fibrillation, which stops effective circulation and causes sudden cardiac arrest. That immediate, life‑threatening possibility is why this finding is so concerning during a symptom-limited test. Syncope can occur from reduced blood flow, but the key danger during the test is the risk of sudden cardiac arrest. Myocardial necrosis is about tissue death from ischemia, not the direct effect of sustained VT itself. Chronic heart failure is a longer-term consequence and not the immediate outcome the test highlights.

Sustained ventricular tachycardia during exercise reveals a highly unstable electrical electrical substrate in the ventricles and indicates the heart may not be able to supply adequate blood flow during stress. When this rapid rhythm persists, cardiac output can drop quickly, leading to dangerous hemodynamic compromise. If the rhythm worsens or degenerates, it can trigger ventricular fibrillation, which stops effective circulation and causes sudden cardiac arrest. That immediate, life‑threatening possibility is why this finding is so concerning during a symptom-limited test.

Syncope can occur from reduced blood flow, but the key danger during the test is the risk of sudden cardiac arrest. Myocardial necrosis is about tissue death from ischemia, not the direct effect of sustained VT itself. Chronic heart failure is a longer-term consequence and not the immediate outcome the test highlights.