Info

🌱 來自: supraventricular tachycardias (SVTS)

VT versus SVT

• Electrocardiographic features that increase the likelihood of VT include:

• Absence of typical RBBB or LBBB morphology

• Extreme axis deviation (“northwest axis”): QRS positive in aVR and negative in I and aVF

• Very broad complexes > 160ms

• AV dissociation:

  • P and QRS complexes at ↣ different rates
  • P waves are often superimposed on QRS complexes and may be difficult to discern

• Capture beats: Occur when the sinoatrial node transiently “captures” the ventricles in the midst of AV dissociation, producing a QRS complex of normal duration

• Fusion beats: Occur when a sinus and ventricular beat coincide to produce a hybrid complex (see Dressler beat)

• VT versus SVT - LITFL Medical Blog - ECG Library Basics

• Brugada Criteria