Online Electrocardiogram

Question 1

Which of the following measurements does the nurse determine is abnormal when examining an ECG strip?

Accepted Answer

PR Interval 0.30, QRS 0.06

Answer

PR Interval 0.12, QRS 0.04

Answer

PR Interval 0.18, ORS 0.06

Answer

PR Interval 0.16, QRS 0.04

Question 2

What information is necessary to have when interpreting an ECG strip?

Accepted Answer

PR interval

Answer

PU segment

Answer

RS segment

Answer

RT interval

Question 3

"The QRS complex represents..." is how the nurse relates the QRS complex to the cardiac cycle.

Accepted Answer

"ventricular depolarization.”

Answer

“atrial repolarization.”

Answer

“atrial depolarization.”

Answer

"ventricular repolarization.”

Question 4

When examining an ECG, the nurse compares the waveform's horizontal movement across the ECG paper to

Accepted Answer

Time.

Answer

Intensity.

Answer

Amplitude.

Answer

Voltage.

Question 5

The ST segment is 3 millimeters below the isoelectric line, as the nurse notes when analyzing the ECG of a patient who is complaining of chest pain.  As the nurse assesses, this is

Accepted Answer

Suggestive of myocardial ischemia.

Answer

Not significant unless it is greater than 5mm.

Answer

An expected finding

Answer

A result of artifact.

Question 6

Which of the following claims best describes the student nurse's comprehension of the ECG measurement sequence?

Accepted Answer

“I need to select an R wave that falls on dark vertical line and number the next 6 dark vertical lines as 300, 150, 100, 75, 60, 50.”

Answer

“I need to count the number of small boxes present and divide that number by 300.”

Answer

“I need to count the number of R waves during a six second period and multiply that number by 10.”

Answer

“I need to count the number of large boxes present and divide that number by 1500.”

Question 7

The nurse looks at an ECG strip, detects a Q wave, and determines that this waveform is

Accepted Answer

Only visible if pathology is present.

Answer

Considered normal if less than 0.04 sec duration and less than 25% of the amplitude of the R wave.