ST depression 定義是 J 點低於基準線 ≧ 0.05 mV
通常會伴隨著 T波倒置或是水平化
當 ST段呈現水平或是漸行沉陷的下降
特別是不只單一導極
合併有臨床症狀
要小心 ACS
- Myocardial ischaemia / NSTEMI
- Reciprocal change in STEMI
- Posterior MI
- Digoxin effect : Downsloping STD + Sagging
- Hypokalaemia
- Supraventricular tachycardia
- RBBB, LBBB
- RVH, LVH
- Ventricular paced rhythm
- Horizontal or downsloping STD ≥ 0.5 mm at the J-point in ≥ 2 contiguous leads
indicates myocardial ischaemia
- Upsloping STD in the precordial leads
with prominent De Winter T is highly specific for occlusion of the LAD.
- Reciprocal change has a morphology that resembles “upside down” STE
and is seen in leads electrically opposite to the site of infarction.
- Posterior MI manifests as
horizontal STD in V1-3
associated with upright T waves and tall R waves.
- Supraventricular tachycardia (e.g. AVNRT) typically causes
widespread horizontal STD, most prominent V4-6
This rate-related STD does not necessarily indicate the presence of myocardial ischaemia,
provided that it resolves with treatment.
https://lifeinthefastlane.com/ecg-library/st-segment/
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