AIVR is a rhythm from the ventricles that is faster than the usual ventricular escape rhythm, but not as fast as ventricular tachycardia. AIVR is like a slow version of VT, but not nearly as serious.
AIVR is usually regular, 50-110bpm, with wide QRS complexes. Fusion and capture beats may be present.
AIVR occurs when an ectopic ventricular pacemaker is faster than the sinus node. It is generally considered benign and self-limiting, although recent reports have suggested it might carry a slightly worse prognosis.
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This ECG is from a man in his 60s who presented with chest pain radiating down his left arm and 2 days of exertional dyspnoea and fatigue.
This ECG shows anterior ST elevation with terminal QRS distortion. At 16:56 there is also a LBBB. The cause was Spontaneous coronary artery dissection (SCAD) of the mid LAD.