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Chapter 32- Test Bank

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Chapter 32- Test Bank

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  • April 19, 2024
  • 36
  • 2023/2024
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  • ATI Pharm Made Easusculoskeletal System
  • ATI Pharm Made Easusculoskeletal System

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Chapter 35: Dysrhythmias Lewis: Medical -
Surgical Nursing, 10th Edition To determi ne whether there is a delay in impulse conduction through the ventricles, the nurse will measure the duration of the patient's a. P wave. c. PR interval. b. Q wave. d. QRS complex. - ANSWER -ANS: D The QRS complex represents ventricular depolarization. The P wave represents the depolarization of the atria. The PR interval represents depolarization of the atria, atrioventricular node, a bundle of His, bundle branches, and the Purkinje fibers. The Q wa ve is the first negative deflection following the P wave and should be narrow and short. Cognitive Level: Understand (comprehension)Chapter The nurse needs to quickly estimate the heart rate for a patient with a regular heart rhythm. Which method will be best to use? a. Count the number of large squares in the R -R interval and divide by 300. b. Print a 1 -minute electrocardiogram (ECG) strip and count the number of QRS complexes. c. Use the 3 -second markers to count the number of QRS complexes in 6 seconds and multiply by 10. d. Calculate the number of small squares between one QRS complex and the next and divide into 1500. - ANSWER -ANS: C This is the quickest way to determine the ventricular rate for a patient with a regular rhythm. All the other methods ar e accurate but take longer. Cognitive Level: Analyze (analysis) A patient has a junctional escape rhythm on the monitor. The nurse will expect the patient to have a heart rate of _____ beats/min. a. 15 to 20 c. 40 to 60 b. 20 to 40 d. 60 to 100 - ANSWER -ANS: C If the sinoatrial (SA) node fails to discharge, the atrioventricular (AV) node will automatically discharge at the normal rate of 40 to 60 beats/minute. The slower rates are typical of the bundle of His and Purkinje system and may be seen with failur e of both the SA and AV node to discharge. The normal SA node rate is 60 to 100 beats/min. The nurse obtains a rhythm strip on a patient who has had a myocardial infarction and makes the following analysis: no visible P waves, PR interval not measurable, ventricular rate of 162, R -R interval regular, and QRS complex wide and distorted, and QRS duration of 0.18 second. The nurse interprets the patient's cardiac rhythm as a. atrial flutter. c. ventricular fibrillation. b. sinus tachycardia. d. ventricular ta chycardia. - ANSWER -ANS: D The absence of P waves, wide QRS, rate greater than 150 beats/min, and the regularity of the rhythm indicate ventricular tachycardia. Atrial flutter is usually regular, has a narrow QRS configuration, and has flutter waves presen t representing atrial activity. Sinus tachycardia has P waves. Ventricular fibrillation is irregular and does not have a consistent QRS duration.

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