EKG Ch. 5-6 Test

Which of the following is a method of calculating heart rate?

• Six-second strip method
• The QT interval method
• The P-P interval method
• All of the above

Regularity of a rhythm is determined by measuring the

• P-P intervals.
• QRS intervals.
• R-R intervals.
• distance between consecutive U waves.

A regular rhythm is one in which the R-R intervals

• vary by only one or two little blocks.
• do not vary at all.
• are the same as the P-P intervals.
• are interrupted by premature beats.

An irregular rhythm is one in which

• the R-R intervals vary "all over the place."
• the R-R intervals vary by only one or two little blocks.
• there are premature beats or pauses that interrupt the otherwise regular rhythm.
• the QRS complexes do not look alike.

Regardless of the method used, what are you doing when you calculate heart rate?

• Counting the number of P waves in a minute-long rhythm strip
• Counting the number of QRS complexes in a minute-long rhythm strip
• Counting the number of premature beats or pauses in a minute-long rhythm strip
• Counting the number of irregular blocks in a minute-long rhythm strip

The mean rate is calculated by

• counting the number of P waves in a minute-long rhythm strip.
• counting the number of QRS complexes in a minute-long rhythm strip.
• counting the number of QRS complexes on a six-second strip and multiplying by 10.
• counting the number of P waves on a six-second strip and multiplying by 10.

The heart rate in Figure 1 is closest to

• 100.
• 75
• 150.
• 50.

The rhythm in Figure 1 is

• regular.
• irregular.
• regular but interrupted by premature beats.
• regular but interrupted by pauses.

The mean rate in Figure 1 is

• 50.
• 60.
• 70.
• 100.

The rhythm in Figure 2 is

• regular.
• irregular.
• regular but interrupted by premature beats.
• regular but interrupted by pauses.