Which type of arrest rhythm can be accompanied by a rhythm display but has no contraction?

The correct answer is pulseless ventricular tachycardia. This condition is characterized by a rapid heart rhythm originating from the ventricles that fails to produce a pulse, despite the presence of electrical activity visible on a rhythm monitor. In pulseless ventricular tachycardia, the heart beats too quickly for effective contraction, meaning that while the heart may be sending out electrical signals, it is not able to effectively pump blood to the body's organs, resulting in a lack of pulse.

Understanding this, it is essential to differentiate this condition from other arrhythmias. For example, while ventricular fibrillation also displays chaotic electrical activity on a monitor without any effective contraction, it is primarily a disorganized rhythm that leads to complete loss of effective heart function. Sinus bradycardia is a slow heart rhythm that can still produce a pulse, meaning contractions are present, albeit at a lower rate. Atrial flutter, on the other hand, is characterized by rapid contractions of the atria that can still maintain a pulse, thus not fitting the criteria of being pulseless.

Overall, the key characteristic of pulseless ventricular tachycardia lies in the inability of the heart to generate an effective contraction despite an observable rhythm on the monitor,