EKG Rhythm Strip Quiz 147: Interval Measurements

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Identify the following rhythms.


1.  What is the PR interval in this rhythm strip?













2.  What is the height of the P waves in the 1st two complexes?












3.  What is the P-P interval and the PR interval in this rhythm strip?













4.  Measure the PR interval in the 1st three complexes.













5.  What is the QT interval in the 1st complex?













6.  What is the duration (in seconds) of the sinus pause in this rhythm strip?














7.  What is the height of ST elevation in the 2nd complex?















8.  What is the R-R interval between the 1st and 2nd complexes and the 3rd and 4th complexes?













9.  What is the depth and width of the Q wave in the 4th complex?













10.  What is the depth of the S wave in the 2nd complex?

















Answers

1.  What is the PR interval in this rhythm strip?
PR:  .32 sec

2.  What is the height of the P waves in the 1st two complexes?
P wave height:  4 mm

3.  What is the P-P interval and the PR interval in this rhythm strip?
P-P interval:  .76 sec. PR interval:  .16 sec

4.  Measure the PR interval in the 1st three complexes.
PR interval:  .28/.36/.40 sec

5.  What is the QT interval in the 1st complex?
QT interval:  .50 sec

6.  What is the duration (in seconds) of the sinus pause in this rhythm strip?
Sinus pause:  1.56 sec

7.  What is the height of ST elevation in the 3rd complex?
Height of ST elevation: 7 mm  (J point + .04)

8.  What is the R-R interval between the 1st and 2nd complexes and the 3rd and 4th complexes?
R-R intervals:  1.28 sec and .96 sec

9.  What is the depth and width of the Q wave in the 4th complex?
Q wave depth and width:  5.5 mm and 0.4 sec

10.  What is the depth of the S wave in the 2nd complex?
S wave depth:  34.5 mm

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