Which of the following rhythms is generally associated with a heart rate of less than 60?

The rhythm commonly associated with a heart rate of less than 60 beats per minute is typically seen in cases of complete heart block, also known as 3rd Degree AV Block. In this condition, there is a complete dissociation between the atria and ventricles, leading the ventricles to depend on an intrinsic escape rhythm, which generally runs at a rate below 60 beats per minute.

This results in significantly reduced heart rates because the electric signals originating from the atria do not reach the ventricles. Instead, the ventricles rely on their own pacemaker activity, which is notably slower than normal atrial rates. As such, recognizing the hallmark of 3rd Degree AV Block being a heart rate of less than 60 is crucial for diagnosis and management of patients with this condition.

The other rhythms listed are typically characterized by different heart rates, such as junctional rhythms or accelerated idioventricular rhythms, which can often present rates above 60. Understanding the association between heart rhythms and their corresponding rates is essential in dysrhythmia identification and treatment.