Question 1

A QRS measuring 100 to 120 ms in adults is called a(n) _________________ right or left BBB.

Accepted Answer

incomplete

Question 2

List five conditions that can mimic myocardial infarction by producing ST-segment elevation.

Accepted Answer

Examples of conditions that can mimic myocardial infarction by producing ST-segment elevation include LVH, BBB, ventricular rhythms, BER, and pericarditis.

Question 3

ECG signs of pericarditis include all of the following EXCEPT:

Accepted Answer

A)   PR segment depression.
B)   notching of the J-point.
C)   R-wave amplitude in V5 that is greater than or equal to 35 mV.
D)   ST-segment elevation that is not strictly grouped into anatomically contiguous leads. C

Question 4

What is meant by the phrase terminal force of the QRS complex?

Accepted Answer

The answer of What is meant by the phrase terminal...

Question 5

BBB increases the width of the QRS complex.

Accepted Answer

A) True 
 B)False

Question 6

Briefly describe how to determine the presence of LVH using the 12-lead ECG.

Accepted Answer

The answer of Briefly describe how to determine the presence...

Question 7

Two conditions must exist to suspect BBB. First, the QRS complex must have an abnormal duration (120 ms or more in width), and second:

Accepted Answer

A)   a slurred upstroke of the QRS complex must exist.
B)   the QRS complex must arise as the result of supraventricular activity.
C)   an RSR' complex must be seen in leads V1-V6.
D)   a QS pattern must be seen in leads I, II, and III.

Question 8

Which lead is probably the best to use when differentiating between right and left BBB?

Accepted Answer

A)   aVR
B)   V1
C)   V4
D)   II

Question 9

A complete BBB is characterized by a:

Accepted Answer

A)   QRS measuring 100 to 120 ms.
B)   QRS measuring more than 120 ms.
C)   PR interval measuring more than 200 ms.
D)   QT interval measuring less than 440 ms.

Question 10

Benign early repolarization (BER):

Accepted Answer

A)   is associated with a significant incidence of cardiogenic shock.
B)   produces ST-segment elevation and tall T waves resembling those seen in the hyperacute phase of myocardial infarction.
C)   most often occurs in elderly males.
D)   should be suspected if the J-point is more than 25% of the height of the T-wave apex.

Question 11

List the ECG criteria for bundle branch recognition.

Accepted Answer

The answer of List the ECG criteria for bundle branch...

Question 12

Which of the following statements is TRUE regarding ventricular hypertrophy?

Accepted Answer

A)   Hypertrophy increases the duration of the QRS complex.
B)   Leads I, aVL, V5, and V6 are the best leads to use when looking for ECG evidence of hypertrophy.
C)   ECG evidence of right ventricular hypertrophy is usually more readily evident than LVH.
D)   Hypertrophy increases the QRS amplitude.

Question 13

In the setting of myocardial infarction, a new onset of BBB carries an increased mortality rate.

Accepted Answer

A) True 
 B)False

Question 14

Patients experiencing ____________ infarctions are most likely to develop BBB.

Accepted Answer

A)   inferior and lateral
B)   anterior and posterior
C)   septal and anteroseptal
D)   inferior and septal

Question 15

Whenever the two criteria for BBB have been met, and lead V1 displays an RSR' pattern, you should suspect a:

Accepted Answer

A)   left BBB.
B)   right BBB.

Exam 7: Critical Thinking