see also [[Torsades de Pointes|TdP]], [[Ventricular Tachycardia|VT]], [[Syncope ECG patterns#WPW]], [[hyperkalemia]], [[ECG artifact]] see: [Mattu Approach to Wide Complex Tachycardia](x-devonthink-item://371DA077-95EB-4C7C-85F6-E8D9026BFEE3?page=163) ![[Pasted image 20230710164407.png|Electrocardiography in Emergency, Acute, a - Amal Mattu.pdf in calibre library. chapter 5]] # Wide complex tachycardia of supraventricular origin Three basic mechanisms: 1. conduction through an accessory pathway ([[Syncope ECG patterns|WPW]]) 2. pre-existinb bundle-branch block or intraventricular conduction delay 3. rate-related bundle-branch block (Ashman phenomenon ; usually RBBB and benign)