# FREE ECG Analysis Practice Test

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

Correct! Wrong!

The nurse notes the presence of a Q wave in an ECG strip; "Both A and C." is the correct response. The first downward deflection that occurs after a P wave is known as a Q wave. Thus, choice A is the best choice. Furthermore, a Q wave is regarded as normal if its duration is less than 0.04 seconds and its amplitude is less than 25% of the R wave's. As a result, choice C is also accurate. Options A and C both provide accurate descriptions of the traits and importance of a Q wave in an ECG strip.

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

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Both the 0.06 QRS and the 0.30 PR Interval fall outside of the typical range. A prolonged PR Interval may be a sign of a conduction delay. The PR Interval measures the amount of time it takes for an electrical signal to pass from the atria to the ventricles. Ventricular depolarization is represented by the QRS complex; a wider QRS complex may indicate a conduction anomaly or bundle branch block. As a result, the provided measurements point to anomalies in the heart's conduction system.

#### 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

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The nurse determines that the ST segment being 3 millimeters below the isoelectric line is suggestive of myocardial ischemia. In a normal ECG, the ST segment should be at the isoelectric line. However, when it is depressed or elevated, it can indicate myocardial ischemia, which is a lack of blood flow to the heart muscle. This finding should be taken seriously as it may indicate an ongoing heart problem and requires further evaluation and intervention.

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

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When interpreting an ECG strip, the PR interval needs to be taken into account. The length of time it takes for an electrical impulse to pass from the atria to the ventricles is represented by the PR interval. It is a crucial measurement for figuring out how well the conduction system is working and can be used to spot anomalies like heart block. Healthcare practitioners can learn more about the electrical activity of the heart and determine the best course of action for treatment by examining the PR interval.

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

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The right response, which explains how to choose a R wave that falls on a dark vertical line and number the following six dark vertical lines as 300, 150, 100, 75, 60, and 50, shows that the student nurse is aware of the sequence method of measuring ECGs. Counting the number of dark vertical lines between R waves and using the assigned numbers to calculate the heart rate is a common method of measuring heart rate on an ECG.

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

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The nurse correctly interprets the QRS complex as ventricular depolarization, which is correlated with the cardiac cycle. The term "depolarization" describes the shift in electrical charge that takes place in heart muscle cells, leading to their contraction. The depolarization of the ventricles, the lower chambers of the heart that pump blood to the rest of the body, is represented by the QRS complex waveform on an electrocardiogram (ECG). As a result, the nurse's explanation of the QRS complex's function in the cardiac cycle is accurate.

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

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The nurse correlates the waveform's horizontal movement across the ECG paper with time when analyzing an ECG. This indicates that the nurse is observing the waveform's changes over a given time frame, which aids in spotting irregularities or trends in the electrical activity of the heart. None of the three terms—amplitude, voltage, and intensity—are directly related to the horizontal movement on the ECG paper. Amplitude denotes the waveform's height, voltage the electrical potential difference, and intensity the waveform's strength or power.