How does ECG lead involvement affect risk stratification?

How does ECG lead involvement affect risk stratification?

• A. More leads with significant ST-segment depression indicate increased disease severity and poorer prognosis.
• B. One lead is enough to determine risk.
• C. ST-segment depression in leads has no prognostic value.
• D. ST-depression always indicates a successful exercise test.

Answer: (A)

The key idea is that how widespread ST-segment depression is across the ECG leads during stress testing reflects how much myocardium is at risk. If significant depression appears in many leads, it means ischemia is affecting multiple regions of the heart, which points to more extensive or severe coronary disease and a higher risk of future events. In contrast, depression seen in just one lead may indicate a more limited ischemic area and less overall risk. ST-segment depression does have prognostic value, so it’s not correct to say it has no value. And ST depression during a test does not mean the test was successful; it signals inducible ischemia and typically prompts further evaluation or treatment.

The key idea is that how widespread ST-segment depression is across the ECG leads during stress testing reflects how much myocardium is at risk. If significant depression appears in many leads, it means ischemia is affecting multiple regions of the heart, which points to more extensive or severe coronary disease and a higher risk of future events. In contrast, depression seen in just one lead may indicate a more limited ischemic area and less overall risk. ST-segment depression does have prognostic value, so it’s not correct to say it has no value. And ST depression during a test does not mean the test was successful; it signals inducible ischemia and typically prompts further evaluation or treatment.