Florida State Paramedic Practice Exam

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What irregular heart rhythm is indicated by "R on T"?

Sinus bradycardia
Ventricular tachycardia
Atrial fibrillation
Ventricular fibrillation

The correct answer is: Ventricular fibrillation

The term "R on T" refers to a specific phenomenon in electrocardiography where a premature ventricular contraction (PVC) occurs at the same time as the T wave of the preceding beat. This situation can lead to dangerous arrhythmias, particularly ventricular fibrillation. Ventricular fibrillation is characterized by rapid, erratic electrical signals in the ventricles, which causes them to quiver instead of pump effectively. When an R wave falls on the T wave, it can potentially trigger this chaotic rhythm, particularly if it falls during the vulnerable period of repolarization when the heart is particularly susceptible to disturbances. This highlights the importance of recognizing the relationship between specific ECG rhythms and their potential complications, especially the timing of heartbeats and their critical phases. Understanding this connection is vital for paramedics in assessing a patient's cardiac status and determining appropriate interventions.