The ECG shows characteristic ______ segments in leads II, III, and aVF, suggesting inferior wall ischemia.
1depressed✓ 정답
2elevated
3horizontal
4sloping
5curved
해설
Depressed ST segments in the inferior leads (II, III, aVF) are characteristic of inferior wall ischemia. This ECG finding indicates reduced blood flow to the inferior wall of the heart, often due to right coronary artery disease.
ECG ST Segment Analysis:
- ST depression: indicates subendocardial ischemia
- ST elevation: indicates transmural injury/infarction
- Reciprocal changes: opposite ST changes in anatomically opposite leads
- Lead mapping for inferior wall:
* Leads II, III, aVF reflect inferior wall
* Right coronary artery (RCA) supplies inferior wall
- Ischemia patterns:
* Horizontal ST depression: classic ischemia
* Downsloping ST depression: severe ischemia
* Upsloping ST depression: less specific
- Associated findings:
* T wave inversion may accompany ST depression
* Q waves indicate previous infarction
* R wave progression changes in V1-V6
핵심 개념
depressed — lowered or pushed downward from normal baseline level on ECG tracing
elevated — raised or lifted upward from normal baseline level on ECG tracing
horizontal — parallel to baseline, forming a flat line on ECG tracing
sloping — angled or inclined either upward or downward on ECG tracing
curved — forming a rounded or arc-shaped pattern on ECG tracing