Question 1

Which of the following is NOT a common characteristic of a premature ventricular complex (PVC)?

Accepted Answer

A) no P wave prior to the QRS complex 
B) widened QRS complex 
C) bizarre QRS complex 
D) narrow QRS 
A) no P wave prior to the QRS complex 
B) widened QRS complex 
C) bizarre QRS complex 
D) narrow QRS D

Question 2

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

Accepted Answer

A) True 
 B)False  True

Question 3

What type of medications may lead to first-degree heart block?

Accepted Answer

A) bronchodilators 
B) corticosteroids 
C) $\beta$-blockers 
D) xanthines 
A) bronchodilators 
B) corticosteroids 
C) $\beta$-blockers 
D) xanthines C

Question 4

What is implied by an abnormally prolonged PR interval?

Accepted Answer

A) atrioventricular block 
B) bundle-branch block 
C) myocardial infarction 
D) valvular detachment 
A) atrioventricular block 
B) bundle-branch block 
C) myocardial infarction 
D) valvular detachment

Question 5

What term is used to define the ability of certain cardiac cells to depolarize without stimulation?

Accepted Answer

A) automaticity 
B) polarization 
C) contraction 
D) repolarization 
A) automaticity 
B) polarization 
C) contraction 
D) repolarization

Question 6

What condition is often associated with right-axis deviation?

Accepted Answer

A) cor pulmonale 
B) congestive heart failure (CHF) 
C) mitral valve prolapse 
D) left ventricular hypertrophy 
A) cor pulmonale 
B) congestive heart failure (CHF) 
C) mitral valve prolapse 
D) left ventricular hypertrophy

Question 7

Which of the following waves represents repolarization of the ventricles?

Accepted Answer

A) P 
B) QRS 
C) T 
D) U 
A) P 
B) QRS 
C) T 
D) U

Question 8

The ECG you are looking at has one P wave for every QRS complex and the PR interval is 0.30 second. What is your interpretation?

Accepted Answer

A) first-degree heart block 
B) right-axis deviation 
C) third-degree heart block 
D) atrial hypertrophy 
A) first-degree heart block 
B) right-axis deviation 
C) third-degree heart block 
D) atrial hypertrophy

Question 9

Which of the following ECG abnormalities is most life threatening?

Accepted Answer

A) narrow QRS complex 
B) shortened PR interval 
C) elevated ST segment 
D) peak P waves 
A) narrow QRS complex 
B) shortened PR interval 
C) elevated ST segment 
D) peak P waves

Question 10

For which of the following arrhythmias would an electronic pacemaker be indicated?

Accepted Answer

A) first-degree block 
B) sinus tachycardia 
C) third-degree block 
D) ventricular fibrillation 
A) first-degree block 
B) sinus tachycardia 
C) third-degree block 
D) ventricular fibrillation

Question 11

Atrial flutter is considered to be a life-threatening arrhythmia.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following waves represents depolarization of the ventricles?

Accepted Answer

A) P wave 
B) QRS wave 
C) T wave 
D) U wave 
A) P wave 
B) QRS wave 
C) T wave 
D) U wave

Question 13

What is the normal period of time for the PR interval?

Accepted Answer

A) not longer than 0.20 second 
B) not longer than 0.30 second 
C) not longer than 0.45 second 
D) not longer than 0.50 second 
A) not longer than 0.20 second 
B) not longer than 0.30 second 
C) not longer than 0.45 second 
D) not longer than 0.50 second

Question 14

What is the width of the normal QRS complex?

Accepted Answer

A) not wider than 1 mm 
B) not wider than 3 mm 
C) not wider than 5 mm 
D) not wider than 7 mm 
A) not wider than 1 mm 
B) not wider than 3 mm 
C) not wider than 5 mm 
D) not wider than 7 mm

Question 15

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?

Accepted Answer

A) less than a 10% chance 
B) less than a 30 % chance 
C) less than 50% chance 
D) no predictive value 
A) less than a 10% chance 
B) less than a 30 % chance 
C) less than 50% chance 
D) no predictive value

Question 16

Which of the following criteria applies to third-degree block?

Accepted Answer

A) There is no relationship between the P waves and the QRS complexes. 
B) The PR interval becomes progressively longer. 
C) The ventricular rate is twice that of the atrial rate. 
D) The QRS complex is inverted compared to the P wave. 
A) There is no relationship between the P waves and the QRS complexes. 
B) The PR interval becomes progressively longer. 
C) The ventricular rate is twice that of the atrial rate. 
D) The QRS complex is inverted compared to the P wave.

Question 17

The QRS of an ECG falls on a dark vertical line of the ECG paper. Subsequent QRS complexes fall on every other dark line (10 mm apart). What is the ventricular rate?

Accepted Answer

A) 300/min 
B) 200/min 
C) 150/min 
D) 100/min 
A) 300/min 
B) 200/min 
C) 150/min 
D) 100/min

Question 18

Which of the following is NOT a common cause of ventricular tachycardia?

Accepted Answer

A) myocardial infarction 
B) coronary artery disease 
C) hypertensive heart disease 
D) pericarditis 
A) myocardial infarction 
B) coronary artery disease 
C) hypertensive heart disease 
D) pericarditis

Question 19

What structure serves as the backup pacemaker for the heart?

Accepted Answer

A) atrioventricular (AV) node 
B) sinoatrial node 
C) bundle of His 
D) Purkinje fibers 
A) atrioventricular (AV) node 
B) sinoatrial node 
C) bundle of His 
D) Purkinje fibers

Question 20

Which of the following axis placements represents right-axis deviation?

Accepted Answer

A) +60 
B) +90 
C) +120 
D) +190 
A) +60 
B) +90 
C) +120 
D) +190

Exam 17: Interpreting the Electrocardiogram

Which of the following is NOT a common characteristic of a premature ventricular complex (PVC)?

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

What type of medications may lead to first-degree heart block?

What is implied by an abnormally prolonged PR interval?

What term is used to define the ability of certain cardiac cells to depolarize without stimulation?

What condition is often associated with right-axis deviation?

Which of the following waves represents repolarization of the ventricles?

The ECG you are looking at has one P wave for every QRS complex and the PR interval is 0.30 second. What is your interpretation?

Which of the following ECG abnormalities is most life threatening?

For which of the following arrhythmias would an electronic pacemaker be indicated?

Atrial flutter is considered to be a life-threatening arrhythmia.

Which of the following waves represents depolarization of the ventricles?

What is the normal period of time for the PR interval?

What is the width of the normal QRS complex?

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?

Which of the following criteria applies to third-degree block?

The QRS of an ECG falls on a dark vertical line of the ECG paper. Subsequent QRS complexes fall on every other dark line (10 mm apart). What is the ventricular rate?

Which of the following is NOT a common cause of ventricular tachycardia?

What structure serves as the backup pacemaker for the heart?

Which of the following axis placements represents right-axis deviation?

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