A 50 year old man presents with central chest pain. He collapsed while his ECG was being recorded. What is the cause of this ECG?
ECG shows ST segment changes in lead II, III indicating inferior wall MI (BLUE ARROW) Ventricular extra-systole after the first beat (RED MARK) In the fouh beat, ventricular Extra-systole (YELLOW) is occurring at time of T wave triggering a polymorphic Ventricular tachycardia. The "R-on-T phenomenon" is the superimposition of an ectopic beat on the T wave of a preceding beat which triggers Polymorphic VT.
R on T phenomenon
Macro-reentrant Circuit
Early after depolarization
AV nodal Re-entry
ECG and Arrhythmia 2