Ch 10

Question 1

1 PVCs characteristically have a __ pause.
a. non-compensatory
b. uncompensatory
c. compensatory
d. 0.30 seconds

Answer 1

c. compensatory

Question 2

2 The QRS complex corresponds to what electrical activity of the heart?
a. Ventricular depolarization
b. Atrial depolarization
c. Ventricular contraction
d. Atrial contraction

Answer 2

a. Ventricular depolarization

Question 3

3 Pacemaker cells found in the Purkinje network in the ventricles have an intrinsic firing rate of __ bpm.
a. 20-30
b. 60-80
c. 40-60
d. 20-40

Answer 3

d. 20 to 40

Question 4

4 Atrial activity is not discerned on the EKG strip in all of the following rhythms except:
a. IVR
b. AIVR
c. A fib
d. V-tach

Answer 4

c. a fib

Question 5

5 Ventricular diastole refers to ventricular:
a. Contraction
b. Relaxation
c. Systole
d. Pressure ratio

Answer 5

b. relaxation

Question 6

6 The heart ventricle with the thickest myocardium is the:
a. right b. left

Answer 6

b. Left

Question 7

7 The coronary arteries receive oxygenated blood from the:
a. Aorta
b. Coronary sinus
c. Pulmonary veins
d. Pulmonary arteries

Answer 7

a. Aorta

Question 8

8 The QRS interval should normally be __ seconds or smaller.
a. 0.20
b. 0.12
c. 0.18
d. 0.36

Answer 8

b. 0.20

Question 9

9 Oscilloscope evidence of ventricular fibrillation can be mimicked by artifact.
a. True b. False

Answer 9

a. True

Question 10

10 The neurotransmitter for the parasympathetic nervous system is acetylcholine. Release of acetylcholine:

1. Slows the heart rate
2. Increases the heart rate
3. Slows atrioventricular conduction
4. increases atrioventricular conduction

a. 1&3
b. 2&3
c. 3&4
d. 1&4

Answer 10

1. Slows the heart rate
2. Increases the heart rate
3. Slows atrioventricular conduction
4. increases atrioventricular conduction

a.1&3

Question 11

11 The most stable characteristic of asystole is the total absence of waveforms on the EKG strip or cardiac monitor.
a. True b. False

Answer 11

a. True

Question 12

12 It may be difficult to distinguish asystole from very fine V-fib; therefore, you must always check __ different leads in order to definitively identify asystole.
a. four
b. three
c. two
d. five

Answer 12

c. Two

Question 13

13 PEA is not an actual rhythm; rather, it represents a clinical condition wherein the patient is clinically dead, despite the fact that some type of organized rhythm appears on the monitor.
a. True b. False

Answer 13

a. True

Question 14

14 This rhythm resembles a turning about or twisting motion along the baseline (isoelectric line).
a. Ventricular tachycardia
b. Ventricular asystole
c. Torsades de pointes
d. Pulseless electrical activity

Answer 14

c. Torsades de pointes

Question 15

15 PEA, a life-threatening dysthymia, may result from:
a. Hypokalemia
b. Hypomagnesemia
c. Tricyclic antidepressant drug overdose
d. All of the above

Answer 15

d. ALL OF THE ABOVE

a. Hypokalemia
b. Hypomagnesemia
c. Tricyclic antidepressant drug overdose
d. All of the above