What defines an escape rhythm?

What defines an escape rhythm?

• A. An intrinsic rhythm that is regular
• B. An automaticity focus escapes overdrive suppression
• C. A fast ventricular response
• D. An atrial contraction that occurs at a normal rate

Answer: (B)

An escape rhythm is characterized by an automaticity focus that escapes the overdrive suppression typically exerted by a more rapid pacemaker, such as the sinus node. This means that when the primary pacemaker (like the sinus node) fails to function effectively or at all, an ectopic focus (a group of heart cells capable of generating impulses) can initiate and take over the pacing of the heart.

In this scenario, the automaticity focus becomes active due to its inherent ability to generate electrical impulses at a slower rate than the sinus node would normally produce but can maintain an essential and life-sustaining rhythm. This mechanism serves as a backup to ensure that the heart continues to beat, albeit potentially at a slower rate.

The other options do not accurately define an escape rhythm. For instance, an intrinsic rhythm that is regular could be referring to a normal sinus rhythm rather than an escape mechanism. A fast ventricular response is more characteristic of other arrhythmias such as tachycardia, where the rate is abnormally elevated. An atrial contraction that occurs at a normal rate does not encapsulate the concept of an escape rhythm, which involves a shift from the primary pacemaker to another focus due to the suppression or failure of that primary pacemaker