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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.




ST-segment-paediatric.jpg


- 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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