Dysrhythmia Concepts Chapter 35 Questions and Answers 2026.docx

Dysrhythmia
Concepts
Chapter 35
Questions and
Answers 2026

, 1. To determine whether there is a delay in impulse conduction through the atria, the nurse will
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measure the duration of the patients k k k k k k




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 answera. P wave.
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The P wave represents the depolarization of the atria. The P-R interval represents
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depolarization of the atria, atrioventricular (AV) node, bundle of His, bundle branches, and the k k k k k k k k k k k k k k




Purkinje fibers. The QRS represents ventricular depolarization. The Q wave is the first k k k k k k k k k k k k k




negative deflection following the P wave and should be narrow and short. k k k k k k k k k k k




2. The nurse needs to quickly estimate the heart rate for a patient with a regular heart rhythm.
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Which method will be best to use? k k k k k k k




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
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into 1500. k k




d. Use the 3-second markers to count the number of QRS complexes in 6 seconds and
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multiply by 10. - correct answerd. Use the 3-second markers to count the number of QRS
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complexes in 6 seconds and multiply by 10. k k k k k k k




This is the quickest way to determine the ventricular rate for a patient with a regular rhythm. All
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the other 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
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have a heart rate of _____ beats/minute. k k k k k k




a. 15 to 20
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b. 20 to 40
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c. 40 to 60
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d. 60 to 100 - correct answerc. 40 to 60
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If the sinoatrial (SA) node fails to discharge, the atrioventricular (AV) node will automatically
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discharge at the normal rate of 40 to 60 beats/minute. The slower rates are typical of the k k k k k k k k k k k k k k k k k




bundle of His and the Purkinje system and may be seen with failure of both the SA and AV node
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to discharge. The normal SA node rate is 60 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
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makes the following analysis: no visible P waves, P-R interval not measurable, ventricular
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rate 162, R-R interval regular, and QRS complex wide and distorted, QRS duration 0.18
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second. The nurse interprets the patients cardiac rhythm as k k k k k k k k k




a. atrial flutter.
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b. sinus tachycardia.
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