Question 1

Patients who experience a(n) _____ myocardial infarction have a greater incidence of heart failure and cardiogenic shock than those who have myocardial infarctions affecting other areas of the left ventricle.

Accepted Answer

A)  lateral 
B)  posterior 
C)  inferior 
D)  anterior

Question 2

Where should the positive electrode for lead V1 be positioned?

Accepted Answer

A)  Right side of the sternum, fourth intercostal space 
B)  Left midaxillary line at the same level as V4 
C)  Left side of the sternum, fourth intercostal space 
D)  Left anterior axillary line at the same level as V4

Question 3

Describe the appearance of a pathologic Q wave.

Accepted Answer

The answer of Describe the appearance of a pathologic Q...

Question 4

Completion
-When reviewing a 12-lead ECG, intervals and duration are usually expressed in _____.

Accepted Answer

The answer of Completion
-When reviewing a 12-lead ECG, intervals and...

Question 5

Anterior or lateral wall myocardial infarctions are most often a result of an occlusion of the _____ coronary artery.

Accepted Answer

A)  left 
B)  right

Question 6

Lead aVL views the _____.

Accepted Answer

A)  interatrial septum 
B)  lateral wall of the left ventricle 
C)  inferior wall of the left ventricle 
D)  anterior wall of the right ventricle

Question 7

The chest leads are the only unipolar leads in the standard 12-lead ECG.

Accepted Answer

A) True 
 B)False

Question 8

An abnormal (i.e., pathologic) Q wave indicates the presence of dead myocardial tissue.

Accepted Answer

A) True 
 B)False

Question 9

Completion
-The axes of leads I, II, and III form an equilateral triangle with the heart at the center (Einthoven's triangle). If the augmented limb leads are added to this configuration and the axes of the six leads moved in a way in which they bisect each other, the result is the _______________.

Accepted Answer

The answer of Completion
-The axes of leads I, II, and...

Question 10

Lead V3 views the _____ wall of the left ventricle.

Accepted Answer

A)  lateral 
B)  anterior 
C)  posterior 
D)  inferior

Question 11

Lead I is perpendicular to lead _____.

Accepted Answer

A)  II 
B)  III 
C)  aVF 
D)  aVL

Question 12

Which leads look at adjoining tissue in the inferior region of the left ventricle?

Accepted Answer

A)  I, aVL 
B)  V1, V2 
C)  V3, V4, V5 
D)  II, III, aVF

Question 13

Lead I views the _____.

Accepted Answer

A)  septum 
B)  inferior wall of the left ventricle 
C)  lateral wall of the left ventricle 
D)  anterior wall of the right ventricle

Question 14

What two factors determine the portion of the heart that each lead "sees"?

Accepted Answer

The answer of What two factors determine the portion of...

Question 15

Which leads look at adjoining tissue in the anterior region of the left ventricle?

Accepted Answer

A)  II, III, aVF 
B)  V2, V3, V4 
C)  I, aVL, V5 
D)  aVR, aVL, aVF

Question 16

Where should the positive electrode for leadd V5 be positioned?

Accepted Answer

A)  Right side of the sternum, fourth intercostal space 
B)  Left midaxillary line at the same level as V4 
C)  Left side of the sternum, fourth intercostal space 
D)  Left anterior axillary line at the same level as V4

Exam 9: Introduction to the 12-Lead Electrocardiogram

Patients who experience a(n) _____ myocardial infarction have a greater incidence of heart failure and cardiogenic shock than those who have myocardial infarctions affecting other areas of the left ventricle.

Where should the positive electrode for lead V₁ be positioned?