ST-segment elevation
ECG finding indicating acute myocardial injury, typically representing transmural ischemia requiring immediate intervention.
Full Definition
ST-segment elevation is an electrocardiographic finding characterized by elevation of the ST segment above the baseline, measured at the J-point. In the context of acute coronary syndromes, ST-segment elevation typically indicates transmural myocardial ischemia or injury, most commonly seen in ST-elevation myocardial infarction (STEMI). The degree and distribution of ST elevation help identify the location and extent of coronary artery occlusion. Criteria for significant ST elevation include ≥1mm elevation in two contiguous leads, or ≥2mm in precordial leads. This finding requires immediate reperfusion therapy, either through primary percutaneous coronary intervention or thrombolytic therapy, making rapid ECG interpretation crucial in emergency settings.
Usage
Usage note: Always specify measurement criteria and lead distribution; distinguish from non-specific ST changes.
In Context
- "ST-segment elevation in leads II, III, and aVF suggested inferior wall myocardial infarction." — ECG interpretation report
- "The patient presented with chest pain and 3mm ST-segment elevation in the anterior leads." — Emergency department assessment