Final answer:
Ventricular rhythms, like ventricular fibrillation, are among the most life-threatening forms of arrhythmia and require immediate treatment with defibrillation to prevent sudden cardiac arrest and potential death. Thus, the statement that they are the most lethal is true.
Step-by-step explanation:
When considering the potential lethality of different types of heart arrhythmias, ventricular rhythms, particularly ventricular fibrillation and ventricular tachycardia, are among the most severe and can be life-threatening. Ventricular fibrillation (VF) is a condition in which the ventricles of the heart beat in an erratic and uncoordinated manner, preventing the heart from pumping blood effectively.
Ventricular fibrillation is a medical emergency that often leads to collapse and sudden cardiac arrest if not treated immediately with defibrillation. Defibrillation involves delivering a therapeutic dose of electrical energy to the heart with a device called a defibrillator. This shock, applied externally, is often depicted in TV dramas with paddles and aims to halt the arrhythmia, allowing the heart's natural pacemaker to re-establish a normal rhythm.
Therefore, the statement that ventricular rhythms are the most lethal type of arrhythmia is True.