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Exam (elaborations)

ECG Final ORIGINAL VERSION.

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ECG Final ORIGINAL VERSION.26. In most patients, the sinoatrial (SA) and atrioventricular (AV) nodes are supplied by the _____ coronary artery. a. right b. left main c. circumflex d. left anterior descending -ANSWER ANS: A-right 27. The intrinsic rate of the atrioventricular (AV) bundle is _____ beats/min. a. 20 to 40 b. 40 to 60 c. 60 to 80 d. 80 to 100 -ANSWER ANS: B-40 to 60 How do you determine whether the atrial rhythm on an ECG tracing is regular or irregular? a. Compare QT intervals. b. Compare PR intervals. c. Compare R to R intervals. d. Compare P to P intervals. -ANSWER C. Compare r to r intervals 28. _____ is the ability of cardiac pacemaker cells to spontaneously initiate an electrical impulse without being stimulated from another source, such as a nerve. a. Excitability b. Conductivity c. Automaticity d. Contractility -ANSWER ANS: C-Automaticity 29. In the heart's conduction system, the _____ receive(s) an electrical impulse from the bundle of His and relay(s) it to the Purkinje fibers in the ventricular myocardium. a. atrioventricular (AV) node b. atria c. sinoatrial (SA) node d. right and left bundle branches -ANSWER ANS: D-right and left bundle branches 30. In the heart's conduction system, the _____ receive(s) an electrical impulse from the right and left bundle branches and relay(s) it to the ventricular myocardium. a. AV node b. SA node c. Purkinje fibers d. atrial pacemaker cells -ANSWER ANS: C-Purkinje fibers 31. What does the QRS complex represent?

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Uploaded on
June 6, 2023
Number of pages
12
Written in
2022/2023
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Exam (elaborations)
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  • on an ecg
  • lead ii records the
  • ecg final original version
  • how do you determine whether the atrial rhythm on
  • is the ability of cardiac pacemaker cells to
  • what is the first negative deflection s
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