Chapter 35 Dysrhythmias Exam With Correct Solutiuons

Chapter 35: Dysrhythmias Exam With
Correct Solutiuons.




1. To determine whether there is a delay in impulse conduction through the atria, the nurse will measure the
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duration of the patients
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a. P wave.
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b. Q wave.
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c. P-R interval.
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d. QRS complex. - CORRECT ANSWER✔✔a. P wave.
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The P wave represents the depolarization of the atria. The P-R interval represents depolarization of the
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atria, atrioventricular (AV) node, bundle of His, bundle branches, and the Purkinje fibers. The QRS
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represents ventricular depolarization. The Q wave is the first negative deflection following the P wave and
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should be narrow and short.
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2. The nurse needs to quickly estimate the heart rate for a patient with a regular heart rhythm. Which
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method will be best to use?
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, a. Count the number of large squares in the R-R interval and divide by 300.
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b. Print a 1-minute electrocardiogram (ECG) strip and count the number of QRS complexes.
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c. Calculate the number of small squares between one QRS complex and the next and divide into 1500.
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d. Use the 3-second markers to count the number of QRS complexes in 6 seconds and multiply by 10. -
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CORRECT ANSWER✔✔d. Use the 3-second markers to count the number of QRS complexes in 6 seconds
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and multiply by 10.
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This is the quickest way to determine the ventricular rate for a patient with a regular rhythm. All the other
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methods are accurate, but take longer.
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3. A patient has a junctional escape rhythm on the monitor. The nurse will expect the patient to have a heart
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rate of _____ beats/minute.
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a. 15 to 20
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b. 20 to 40 j j j j




c. 40 to 60
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d. 60 to 100 - CORRECT ANSWER✔✔c. 40 to 60
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If the sinoatrial (SA) node fails to discharge, the atrioventricular (AV) node will automatically discharge at
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the normal rate of 40 to 60 beats/minute. The slower rates are typical of the bundle of His and the Purkinje
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system and may be seen with failure of both the SA and AV node to discharge. The normal SA node rate is 60
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to 100 beats/minute.
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4. The nurse obtains a rhythm strip on a patient who has had a myocardial infarction and makes the
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following analysis: no visible P waves, P-R interval not measurable, ventricular rate 162, R-R interval regular,
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and QRS complex wide and distorted, QRS duration 0.18 second. The nurse interprets the patients cardiac
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rhythm as
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a. atrial flutter.
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