QQuestionAnatomy and Physiology
QuestionAnatomy and Physiology
RHYTHM # NORMAL SINUS RHYTHM WITH PJC
What is the rate of this rhythm? Be sure to calculate using the appropriate method.
Select one:
a. 50 bpm
b. 53 bpm
c. 60 bpm
d. 79
Question 38
Does the frequency of the beats with this rhythm vary?
Select one:
a. Yes
b. No
Question 39
How are the P-waves for the regular beats of this rhythm? Select all that applies.
Select one or more:
a. P-waves are present.
b. P-waves are not present.
c. Extra P-waves (P-waves with no associated QRS-complexes) are present.
d. P-waves are upright.
e. P-waves are inverted.
f. P-waves are retrograded.
Question 40
How are the PR-intervals for the regular beats of this rhythm? Select all that applies.
Select one or more:
a. PR-intervals are normal.
b. PR-intervals are prolonged.
c. PR-intervals are unmeasurable.
d. PR-intervals that appear are all the same.
e. PR-intervals that appear are not all the same.
Question 41
How are the QRS-complexes for the regular beats of this rhythm? Select all that applies.
Select one or more:
a. QRS-complexes are normal.
b. QRS-complexes are wide.
c. QRS-complexes are absent.
Question 42
Are there any Premature Beats within this rhythm, and if so, what are the beats’ characteristics? Indicate all that applies.
Select one or more:
a. Premature beats are present.
b. Premature beats are not present.
c. Premature beats have P-waves
d. Premature beats do not have P-waves.
e. Premature beats have P-waves that are upright.
f. Premature beats have P-waves that are inverted.
g. Premature beats have P-waves that are retrograded.
h. Premature beats’ QRS-complexes are normal.
i. Premature beats’ QRS-complexes are wide.
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Answer
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Step 1: Determine the rate of the rhythm.
\text{Rate} = \frac{300 \ \text{mm/s}}{2 \ \text{big squares}} = 150 \ \text{bpm}
To calculate the rate, we need to count the number of big squares between two R waves and then divide 300 by this value. In this case, there are 2 big squares between two R waves. So, the rate is given by:
Step 2: Determine if the frequency of the beats varies.
From the given rhythm strip, the frequency of the beats appears to be regular with no variation in the R-R interval.
Final Answer
The PR-intervals appear to be normal and the same for all regular beats.
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