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An R on T premature ventricular complex (PVC) is an important concept in ECG reading as it may lead to ventricular tachycardia, ventricular fibrillation, and possibly sudden cardiac death. Recognizing an R on T PVC on a rhythm strip may save a patient’s life.
Apr 27, 2015 · ECG taken immediately after successful electrical defibrillation revealed ST elevation in V1–3 suggesting hyperacute anterior myocardial infarction (MI) (Fig. 2). Emergency coronary angiography showed a total occlusion of the middle part of the left anterior descending artery, which was successfully revascularized with a bare metal stent.
Apr 15, 2023 · Frequent PVCs with ‘R on T’ phenomenon trigger a run of polymorphic VT which subsequently begins degenerates into VF. QT interval is difficult to see because of artefact but appears slightly prolonged (QTc ~480ms), making this likely to be TdP.
Dec 16, 2019 · Spontaneous initiation of arrhythmias in long QT syndromes exhibits genotype-dependent ECG features including T-wave alternans, short-long-short sequence (or a pause). R-on-T is the most common ECG phenomenon during ventricular arrhythmia initiation in long QT syndromes (LQTS).
The "R-on-T phenomenon" is the superimposition of an ectopic beat on the T wave of a preceding beat. Early observations suggested that R-on-T was likely to initiate sustained ventricular tachyarrhythmias. More recent experimental and clinical observations suggest that R-on-T is not a critical determ ….
PVCs may occur early in the cycle (R-on-T phenomenon), after the T wave (as seen above), or late in the cycle - often fusing with the next QRS (fusion beat). R-on-T PVCs may be especially dangerous in an acute ischemic situation, because the ventricles may be more vulnerable to ventricular tachycardia or fibrillation.
A premature ventricular complex is recognized on the ECG as an abnormal and wide QRS complex occurring earlier than expected in the cardiac cycle. It is caused by an impulse discharged from an ectopic focus which may be located anywhere in the ventricles.
