Question 1

The ___________ represents ventricular repolarization.

Accepted Answer

A)  T wave 
B)  U wave 
C)  QT interval 
D)  ST segment 
A)  T wave 
B)  U wave 
C)  QT interval 
D)  ST segment A

Question 2

A prolonged QT interval:

Accepted Answer

A)  indicates prolonged ventricular repolarization. 
B)  can be caused by hypercalcemia or digoxin toxicity. 
C)  is defined as one having a duration of greater than 0.50 seconds. 
D)  can predispose the patient to dysrhythmias such as sinus tachycardia. 
A)  indicates prolonged ventricular repolarization. 
B)  can be caused by hypercalcemia or digoxin toxicity. 
C)  is defined as one having a duration of greater than 0.50 seconds. 
D)  can predispose the patient to dysrhythmias such as sinus tachycardia. A

Question 3

The duration of the ST segment is normally ________ seconds.

Accepted Answer

A)  0.08 to 0.12 
B)  0.06 to 0.10 
C)  0.08 to 0.10 
D)  0.08 to 0.14 
A)  0.08 to 0.12 
B)  0.06 to 0.10 
C)  0.08 to 0.10 
D)  0.08 to 0.14 A

Question 4

The QT interval:

Accepted Answer

A)  represents the time needed for ventricular repolarization. 
B)  is prolonged when ventricular repolarization is accelerated. 
C)  extends from the beginning of the P wave to the end of the T wave. 
D)  is usually between 0.36 and 0.44 seconds in duration. 
A)  represents the time needed for ventricular repolarization. 
B)  is prolonged when ventricular repolarization is accelerated. 
C)  extends from the beginning of the P wave to the end of the T wave. 
D)  is usually between 0.36 and 0.44 seconds in duration.

Question 5

ST segment changes are identified by:

Accepted Answer

A)  measuring from the beginning of the ST segment to its end. 
B)  comparing the ST segment with the PR segment. 
C)  comparing the ST segment with the TP segment. 
D)  b & c 
A)  measuring from the beginning of the ST segment to its end. 
B)  comparing the ST segment with the PR segment. 
C)  comparing the ST segment with the TP segment. 
D)  b & c

Question 6

The ST segment begins at the ________.

Accepted Answer

A)  upslope of the S wave 
B)  J point 
C)  M point 
D)  point where the R and S wave meet 
A)  upslope of the S wave 
B)  J point 
C)  M point 
D)  point where the R and S wave meet

Question 7

To measure the QT interval, first locate the isoelectric line immediately preceding the Q wave (or R wave if there is no Q wave). Next, locate the end of the T wave. Count the number of boxes in between these two points.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following is commonly assessed with the T wave?

Accepted Answer

A)  Configuration 
B)  Amplitude 
C)  Deflection 
D)  All of these 
A)  Configuration 
B)  Amplitude 
C)  Deflection 
D)  All of these

Question 9

For proper measurement of the ST segment, we use a point ____ seconds after the J point to identify changes.

Accepted Answer

A)  0.02 
B)  0.04 
C)  0.06 
D)  0.08 
A)  0.02 
B)  0.04 
C)  0.06 
D)  0.08

Question 10

The T wave is best described as a/an:

Accepted Answer

A)  large, upright, round, asymmetrical waveform. 
B)  isoelectric line. 
C)  interval that extends from the beginning of the Q wave to the end of the T wave. 
D)  small, upright, round, asymmetrical waveform. 
A)  large, upright, round, asymmetrical waveform. 
B)  isoelectric line. 
C)  interval that extends from the beginning of the Q wave to the end of the T wave. 
D)  small, upright, round, asymmetrical waveform.

Question 11

The J point is not always easy to identify when assessing the ST segment. Sometimes you can identify it by looking for a small notch, slope, or other movement that suggests an alteration of electrical flow.

Accepted Answer

A) True 
 B)False

Question 12

The height of the T wave is normally no greater than ________ mm in the precordial leads.

Accepted Answer

A)  2 
B)  5 
C)  10 
D)  15 
A)  2 
B)  5 
C)  10 
D)  15

Question 13

Prominent U waves are seen in:

Accepted Answer

A)  hypokalemia. 
B)  myocardial infarction. 
C)  digitalis toxicity. 
D)  All of these 
A)  hypokalemia. 
B)  myocardial infarction. 
C)  digitalis toxicity. 
D)  All of these

Question 14

T waves with bumps may be seen when P waves are buried in the T waves.

Accepted Answer

A) True 
 B)False

Question 15

T waves seen with impulses that arise from the ventricles take the same direction as their associated QRS complexes.

Accepted Answer

A) True 
 B)False

Question 16

An ST segment is considered depressed if it is:

Accepted Answer

A)  0.5 to 1.0 above the baseline. 
B)  more than 1.0 mm above the baseline. 
C)  more than 1.0 mm below the baseline. 
D)  more than 5.0 mm above the baseline. 
A)  0.5 to 1.0 above the baseline. 
B)  more than 1.0 mm above the baseline. 
C)  more than 1.0 mm below the baseline. 
D)  more than 5.0 mm above the baseline.

Question 17

ST segment depression suggests:

Accepted Answer

A)  Myocardial ischemia 
B)  Myocardial injury 
C)  Right and left ventricular hypertrophy 
D)  a & c 
A)  Myocardial ischemia 
B)  Myocardial injury 
C)  Right and left ventricular hypertrophy 
D)  a & c

Question 18

Which of the following is "most commonly" assessed with the ST segment?

Accepted Answer

A)  Elevation 
B)  Depression 
C)  Duration 
D)  a and b 
A)  Elevation 
B)  Depression 
C)  Duration 
D)  a and b

Question 19

The ST segment is best described as a/an:

Accepted Answer

A)  large, upright, round, asymmetrical waveform. 
B)  isoelectric line. 
C)  interval that extends from the beginning of the Q wave to the end of the T wave. 
D)  small, upright, round, asymmetrical waveform. 
A)  large, upright, round, asymmetrical waveform. 
B)  isoelectric line. 
C)  interval that extends from the beginning of the Q wave to the end of the T wave. 
D)  small, upright, round, asymmetrical waveform.

Question 20

The T wave begins at the ________.

Accepted Answer

A)  upslope of the S wave 
B)  J point 
C)  M point 
D)  point where the ST segment ends 
A)  upslope of the S wave 
B)  J point 
C)  M point 
D)  point where the ST segment ends

Exam 9: ST Segments, T-Waves, QT Intervals, and U-Waves

The ___________ represents ventricular repolarization.

A prolonged QT interval:

The duration of the ST segment is normally ________ seconds.

The QT interval:

ST segment changes are identified by:

The ST segment begins at the ________.

To measure the QT interval, first locate the isoelectric line immediately preceding the Q wave (or R wave if there is no Q wave). Next, locate the end of the T wave. Count the number of boxes in between these two points.

Which of the following is commonly assessed with the T wave?

For proper measurement of the ST segment, we use a point ____ seconds after the J point to identify changes.

The T wave is best described as a/an:

The J point is not always easy to identify when assessing the ST segment. Sometimes you can identify it by looking for a small notch, slope, or other movement that suggests an alteration of electrical flow.

The height of the T wave is normally no greater than ________ mm in the precordial leads.

Prominent U waves are seen in:

T waves with bumps may be seen when P waves are buried in the T waves.

T waves seen with impulses that arise from the ventricles take the same direction as their associated QRS complexes.

An ST segment is considered depressed if it is:

ST segment depression suggests:

Which of the following is "most commonly" assessed with the ST segment?

The ST segment is best described as a/an:

The T wave begins at the ________.

Anatomy and Electrophysiology of the Heart

The Electrocardiogram

Analyzing the Electrocardiogram

Heart Rate

Regularity

P-Waves

QRS Complexes

PR Intervals

Overview of Dysrhythmias

Origin and Clinical Aspects of Sinus Node Dysrhythmias

Origin and Clinical Aspects of Atrial Dysrhythmias

Origin and Clinical Aspects of Junctional Dysrhythmias

Origin and Clinical Aspects of Ventricular Dysrhythmias

Origin and Clinical Aspects of AV Heart Blocks

Pacemakers and Implanted Cardioverter-Defibrillators

12 Lead ECGS

Atrial Enlargement and Ventricular Hypertrophy

Bundle Branch Block

Myocardial Ischemia and Infarction

Other Cardiac Conditions and the ECG

Putting It All Together

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