Dysrhythmias Chapter 35 Exam with Questions and Answers

Dysrhythmias Chapter 35 Exam with Questions and Answers 1. What accurately describes electrocardiographic (ECG) monitoring? a. Depolarization of the cells in the ventricles produces the T wave on the ECG. b. An abnormal cardiac impulse that arises in the atria, ventricles, or atrioventricular (AV) junction can create a premature beat that is known as an artifact. c. Lead placement for V1 includes one lead each for right arm, right leg, left arm, and left leg with the fifth lead on the fourth intercostal space to the right of the sternal border. d. If the sinoatrial (SA) node fails to discharge an impulse or discharges very slowly, a secondary pacemaker in the AV node is able to discharge at a rate of 30 to 40 times per minute ANSWER c. Lead placement for V1 includes one lead each for right arm, right leg, left arm, and left leg with the fifth lead on the fourth intercostal space to the right of the sternal border. 2. What accurately describes the PR interval (select all that apply)? a. 0.16 seconds a. 0.12 seconds c. 0.06 to 0.12 seconds d. 0.12 to 0.20 seconds e. Time of depolarization and repolarization of ventricles f. Measured from beginning of P wave to beginning of QRS complex ANSWER d. 0.12 to 0.20 seconds