Nurs 3000 - content after midterm Questions with Complete Solutions

When computing a heart rate from the ECG tracing, the nurse counts 15 of the small blocks between the R waves of a client whose rhythm is regular. From these data, which of the following rates should the nurse calculate as the client's heart rate? Correct Answer-A: 60 beats/minute B: 75 beats/minute C: 100 beats/minute A D: 150 beats/minute A: C- Since each small block on the ECG paper represents 0.04 seconds, 1 500 of these blocks represents 1 minute. By dividing the number of small blocks (15 in this case) into 1 500, the nurse can calculate the heart rate in a client whose rhythm is regular (in this case, 100). Which of the following statements best describes the electrical activity of the heart represented by measuring the PR interval on the ECG? Correct Answer-A: The length of time it takes to depolarize the atrium B: The length of time it takes for the atria to depolarize and repolarize C: The length of time for the electrical impulse to travel from the SA node to the Purkinje fibres D: The length of time it takes for the electrical impulse to travel from the SA node to the AV node A: C - The electrical impulse in the heart must travel from the SA node through the AV node and into the