Chapter 17 Interpreting the Electrocardiogram

Chapter 17  Interpreting the Electrocardiogram

Complete Chapter Questions And Answers
 

Sample Questions

MULTIPLE CHOICE

1. The electrocardiogram (ECG) is primarily used to evaluate the patient with symptoms suggestive of acute myocardial disease.
a.
True
b.
False

ANS: A
The ECG is used primarily to evaluate the patient with an acute clinical condition suggestive of myocardial disease.

DIF: Recall REF: p. 368 OBJ: 1

2. Your patient has a normal ECG reading. What does this finding tell you about the patient’s likelihood of having a myocardial infarction in the immediate future?
a.
less than a 10% chance
b.
less than a 30 % chance
c.
less than 50% chance
d.
no predictive value

ANS: D
The resting ECG has no value as a predictor of future heart attacks.

DIF: Application REF: p. 368 OBJ: 1

3. Valvular defects in the heart can be detected with a 12-lead ECG.
a.
True
b.
False

ANS: B
Certain abnormalities, such as valvular defects, cannot be identified directly by the ECG.

DIF: Recall REF: p. 368 OBJ: 1

4. What term is used to define the ability of certain cardiac cells to depolarize without stimulation?
a.
automaticity
b.
polarization
c.
contraction
d.
repolarization

ANS: A
The ability of these cells to depolarize without stimulations is known as automaticity.

DIF: Recall REF: p. 369 OBJ: 2

5. What structure normally paces the healthy heart?
a.
atrioventricular (AV) node
b.
sinoatrial (SA) node
c.
bundle of His
d.
Purkinje fibers

ANS: B
Normally, the SA node, which is located in the upper portion of the right atrium, has the greatest degree of automaticity and therefore paces the heart.

DIF: Recall REF: p. 369 OBJ: 3