Patient Care Technician (PCT) AAH Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

Prepare for the Patient Care Technician AAH Exam with our comprehensive exam. Use flashcards and multiple-choice questions, each equipped with hints and explanations. Get ready to excel!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

In a 2:1 AV block, how does the PR interval behave?

It remains constant
It shortens
It lengthens
It varies significantly

The correct answer is: It lengthens

In a 2:1 AV block, the characteristic behavior of the PR interval is that it typically lengthens until a dropped beat occurs. This is due to the progressive nature of the block, which is known as Mobitz type 1 or Wenckebach. In this type of block, there is a gradual increase in the duration of the PR intervals with each successive beat until a QRS complex is dropped (i.e., a ventricular response does not follow a P wave). This leads to a cyclical pattern of lengthening PR intervals. The presence of this progressive lengthening aligns with the key characteristic of 2:1 AV block, making it essential for care technicians to be able to recognize this pattern on an ECG. Understanding the behavior of the PR interval in relation to the block helps in assessing and providing appropriate care interventions for patients experiencing arrhythmias.