What does ST-segment depression indicate on telemetry?

What does ST-segment depression indicate on telemetry?

• A. Possible myocardial ischemia, especially with concomitant symptoms or T-wave changes
• B. Normal variant
• C. Hyperkalemia
• D. Pericarditis

Answer: (B)

ST-segment depression on telemetry signals possible myocardial ischemia, typically indicating subendocardial ischemia. When a patient has chest discomfort or other ischemic symptoms, or when T-wave changes accompany the depression, this finding becomes clinically significant and raises concern for unstable angina or NSTEMI. In practice, horizontal or downsloping ST depression of 0.5 mm or more is considered abnormal and prompts further evaluation, including serial ECGs and troponin checks, along with clinical correlation. To put it in context with other patterns: hyperkalemia tends to produce tall, peaked T waves and QRS widening; pericarditis more often shows diffuse ST-segment elevations with PR depressions; a normal variant would not typically present with ST depression. The key takeaway is that ST-segment depression most strongly points to possible myocardial ischemia, especially when symptoms or T-wave changes are present.

ST-segment depression on telemetry signals possible myocardial ischemia, typically indicating subendocardial ischemia. When a patient has chest discomfort or other ischemic symptoms, or when T-wave changes accompany the depression, this finding becomes clinically significant and raises concern for unstable angina or NSTEMI. In practice, horizontal or downsloping ST depression of 0.5 mm or more is considered abnormal and prompts further evaluation, including serial ECGs and troponin checks, along with clinical correlation.

To put it in context with other patterns: hyperkalemia tends to produce tall, peaked T waves and QRS widening; pericarditis more often shows diffuse ST-segment elevations with PR depressions; a normal variant would not typically present with ST depression. The key takeaway is that ST-segment depression most strongly points to possible myocardial ischemia, especially when symptoms or T-wave changes are present.