TEST BANK FOR ECGS MADE EASY 6TH EDITION BY BARBARA Chapter 03: Sinus Mechanisms

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Chapter 03: Sinus Mechanisms Test Bank MULTIPLE CHOICE 1. In sinus arrhythmia, a gradual increasing of the heart rate is usually associated with _____. a. expiration b. inspiration c. excessive caffei... ne intake d. early signs of heart failure ANS: B Sinus arrhythmia that is associated with the phases of breathing and changes in intrathoracic pressure is called respiratory sinus arrhythmia. The rhythm is irregular; the heart rate increases gradually during inspiration (R-R intervals shorten) and decreases with expiration (R-R intervals lengthen). OBJ: Describe the ECG characteristics, possible causes, signs and symptoms, and emergency management of sinus arrhythmia. 2. The rate of sinus tachycardia is _____ beats/min. a. slower than 60 b. 40 to 80 c. 60 to 100 d. faster than 100 ANS: D The rate of sinus tachycardia is between 101 and 180 beats/min. OBJ: Describe the ECG characteristics, possible causes, signs and symptoms, and emergency management of sinus tachycardia. 3. An ECG rhythm strip shows a ventricular rate of 46 bpm, a regular rhythm, a PR interval of 0.14 seconds, a QRS duration of 0.06 seconds, and one upright P wave before each QRS. This rhythm is _____. a. sinus rhythm b. sinus bradycardia c. sinus arrest d. sinoatrial block ANS: B The rhythm described fits the ECG criteria for a sinus bradycardia. OBJ: Describe the ECG characteristics, possible causes, signs and symptoms, and emergency management of sinus bradycardia. 4. An ECG rhythm strip shows a ventricular rate of 128 bpm, a regular rhythm, a PR interval of 0.16 seconds, a QRS duration of 0.08 seconds, and one upright P wave before each QRS. This rhythm is sinus _____. a. arrhythmia b. bradycardia c. rhythm d. tachycardia ANS: D The rhythm described fits the ECG criteria for a sinus tachycardia. OBJ: Describe the ECG characteristics, possible causes, signs and symptoms, and emergency management of sinus tachycardia. 5. Which of the following are possible causes of sinus tachycardia? a. Hypothermia, hypovolemia b. Hypoxia, calcium channel blocker overdose c. Fever, pain, anxiety d. Vomiting, vagal maneuvers ANS: C Causes of sinus tachycardia include: acute myocardial infarction; caffeine-containing beverages; dehydration, hypovolemia; drugs such as cocaine, amphetamines, ecstasy, cannabis; exercise; fear and anxiety; fever; heart failure; hyperthyroidism; hypoxia; infection; medications such as epinephrine, atropine, and dopamine; nicotine; pain; pulmonary embolism; shock; sympathetic stimulation. OBJ: Describe the ECG characteristics, possible causes, signs and symptoms, and emergency management of sinus tachycardia. 6. Which of the following are possible causes of sinus bradycardia? a. Elevated temperature, pain [Show More]

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