Atrioventricular Nodal Reentrant Tachycardia (AVNRT) is a type of SVT and is the commonest cause of palpitations in patients with hearts exhibiting no structurally abnormality.
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Brugada Syndrome – ECG abnormality with a high incidence of sudden death in patients with structurally normal hearts. Brugada – EKG Library
Review of first degree AV block with some ECG examples – PR interval > 200ms (five small squares) LITFL ECG Library
Trifascicular block (TFB) refers to the presence of conducting disease in all three fascicles: RBBB, LAFB, LPFB. LITFL EKG Library