Understanding the QRS Complex

What is the normal range for the QRS complex duration in seconds?

• 0.02 to 0.10

• 0.04 to 0.10

• 0.06 to 0.10

• 0.04 to 0.20

The QRS interval measures from where the Q wave first leaves the isoelectric line to where the T wave returns to the isoelectric line.

• True

• False

The normal QRS interval is less than what duration in seconds?

• 0.22

• 0.16

• 0.12

• 0.02

Which wave follows the QRS complex and indicates ventricular repolarization?

• S Wave

• T Wave

• P Wave

• R Wave

What starts at the beginning of the P wave and ends at the beginning of the Q wave?

• S Wave

• P-R interval

• Q Wave

• T Wave

Can an elevated S-T segment indicate Myocardial Infarction?

• Correct

• Incorrect

The 6-second rule is simple and works well in estimating the rate of an irregular rhythm. What is an example of a 6-second rule?

• 7 QRS complexes in 6 seconds. 6 X 10 = 70/min.

• 7 QRS complexes in 8 seconds. 7 X 10 = 70/min.

• 7 QRS complexes in 6 seconds. 7 X 10 = 70/min.

• 5 QRS complexes in 6 seconds. 7 X 10 = 70/min.

• None of the Above

• 6 second rule

• 1500 rule

• 300 method

This is a wonderful rule to apply most of the time, with one exception: it cannot be used in irregular rhythms.

• 300 method

• 6 second rule

• 600 method

• 1500 rule

There are 300 large, 5 mm boxes in every minute of EKG tracing at the normal 25mm/second print speed. Which method does this describe?

• 6 second rule

• 300 method

• 150 rule

• 1500 rule