R-on-t phenomenon

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Definition

noun

In electrocardiographic tracing, it is the superimposition of an ectopic beat on the T wave of a preceding beat, or simply, R waves interrupting T waves.


Supplement

In patients, it manifests as premature ventricular beat occurring in early diastole, and in most cases, it leads to serious ventricular arrhythmia or ventricular fibrillation.

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