## Medical Surgical Cardiac Fundamentals #4

### Question

The nursing student is reviewing electrocardiogram (ECG) strips. Which measurement(s) is/are considered normal QRS complex measurements? Select all that apply.

1. 0.04 second
• Rationale:

This answer is correct because a QRS complex of 0.04 second is a normal finding. Normal sinus rhythm on the ECG is represented by PR interval measures 0.12 – 0.20 second, and the QRS complex measures 0.04 – 0.10 second.

2. 0.08 second
• Rationale:

This answer is correct because a QRS complex of 0.08 second is a normal finding. Normal sinus rhythm on the ECG is represented by PR interval measures 0.12 – 0.20 second, and the QRS complex measures 0.04 – 0.10 second.

3. 0.10 second
• Rationale:

This answer is correct because a QRS complex of 0.10 second is a normal finding. Normal sinus rhythm on the ECG is represented by PR interval measures 0.12 – 0.20 second, and the QRS complex measures 0.04 – 0.10 second.

4. 0.12 second
• Rationale:

This answer is not correct because a QRS complex of 0.12 second is too long and not a normal finding. This could be representative of a right or left bundle block. This finding should be reported to the healthcare provider. Normal sinus rhythm on the ECG is represented by PR interval measures 0.12 – 0.20 second, and the QRS complex measures 0.04 – 0.10 second.

5. 0.20 second
• Rationale:

This answer is not correct because a QRS complex of 0.20 second is too long and not is a normal finding. This finding should be reported to the healthcare provider. Normal sinus rhythm on the ECG is represented by PR interval measures 0.12 – 0.20 second, and the QRS complex measures 0.04 – 0.10 second.

### Overview

The normal QRS complex measures 0.04 – 0.10 second.

### Learning Outcomes

An electrocardiogram (ECG) is a non-invasive cardiac test that uses electrodes on the body that reads and records the electrical signal from the heart. The information is available on the monitor screen and/or the print out of the ECG. Healthcare providers are trained to read the ECG strip and detect abnormalities in the rate and rhythm of the heart. Normal sinus rhythm consists of heart rate between 60 and 100 beats per minute with regular rhythm. Normal sinus rhythm on the ECG is represented by PR interval measures 0.12 – 0.20 second, and the QRS complex measures 0.04 – 0.10 second.

### Test Taking Tip

It is very important to know the normals of the ECG rhythms so abnormalities can be identified and reported.