[MCQ] Electrocardiography- Part 3

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Electrocardiography- Part 3

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Congratulations - you have completed Electrocardiography- Part 3. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rated as %%RATING%%

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Question 1

Alternation of right & left bundle branch block is a sign of ?

A	Bifascicular disease
B	Trifascicular disease
C	Complete heart block
D	AV Dissociation

Question 2

Intraventricular conduction delays can be caused by ?

A	Hyperkalemia
B	Tricyclic antidepressants
C	Phenothiazines
D	All of the above

Question 2 Explanation:

Intraventricular conduction delays can be caused by toxic factors that slow ventricular conduction (hyperkalemia, class 1 antiarrhythmic agents, tricyclic antidepressants, phenothiazines).

Question 3

Which of the following is diagnostic of Wolff-Parkinson-White syndrome ?

A	Wide QRS complex
B	Relatively short PR interval
C	Slurring of initial part of QRS (delta wave)
D	All of the above

Question 3 Explanation:

Prolongation of QRS duration does not necessarily indicate a conduction delay but may be due toA form of ventricular preexcitation via a bypass tract, Wolff-Parkinson-White (WPW) syndrome is diagnosed by a triad consisting of a wide QRS complex associated with a relatively short PR interval and slurring of the initial part of the QRS (delta wave), with the latter effect being due to aberrant activation of ventricular myocardium.

Question 4

Which of the following about myocardial ischemia is false ?

A	Complex time-dependent effects on electrical properties of myocardial cells
B	Severe, acute ischemia lengthens duration of action potential
C	Cause a voltage gradient between normal & ischemic zones
D	Leads to flow of currents of injury

Question 5

Wellens T waves are usually associated with ?

A	Stenosis of left anterior descending coronary artery
B	Stenosis of posterior descending coronary artery
C	Stenosis of left circumfles coronary artery
D	Stenosis of right coronary artery

Question 5 Explanation:

Severe anterior wall ischemia (with or without infarction) may cause prominent T-wave inversions in the precordial leads. This pattern referred to as Wellens T waves is usually associated with a high-grade stenosis of the left anterior descending coronary artery

Question 6

Atrial infarction may be associated with ?

A	PR-segment deviations
B	Changes in P-wave morphology
C	Atrial arrhythmias
D	All of the above

Question 6 Explanation:

Atrial infarction may be associated with PR-segment deviations due to an atrial current of injury, changes in P-wave morphology, or atrial arrhythmias

Question 7

Diagnostic changes of acute or evolving ischemia are masked by ?

A	Left bundle branch block
B	Electronic ventricular pacemaker patterns
C	Electronic ventricular pacemaker patterns
D	All of the above

Question 7 Explanation:

Diagnostic changes of acute or evolving ischemia can be masked by presence of LBBB, electronic ventricular pacemaker patterns & WPW preexcitation

Question 8

Osborn wave in ECG is found in ?

A	Heat stroke
B	Hypothermia
C	Cerebrovascular accident
D	Cerebrovascular accident

Question 8 Explanation:

Systemic hypothermia also prolongs repolarization, usually with a distinctive convex elevation or “hump”at the J point referred to as Osborn wave. It is due to altered ventricular action potential characteristics

Question 9

ST-segment elevations simulating ischemia may occur with ?

A	Hypercalcemia
B	Hyperkalemia
C	Hypothermia
D	All of the above

Question 10

ST-segment elevations simulating ischemia may occur with ?

A	Acute pericarditis
B	Myocarditis
C	Brugada syndrome
D	All of the above

Question 11

Tall, positive T waves are seen in ?

A	Hyperkalemia
B	Cerebrovascular injury
C	Left ventricular volume overload (MR or AR)
D	Left ventricular volume overload (MR or AR)

Question 11 Explanation:

Tall, positive T waves may be seen in hyperacute ischemic changes, normal variants, hyperkalemia, cerebrovascular injury & left ventricular volume overload due to mitral or aortic regurgitation.

Question 12

The first ECG change in hyperkalemia is ?

A	The first ECG change in hyperkalemia is ?
B	Narrowing & peaking (tenting) of T waves
C	Widening of QRS interval
D	AV conduction disturbances

Question 12 Explanation:

ECG changes in hyperkalemia usually begin with narrowing and peaking (tenting) of the T waves. Further elevation of extracellular K+ leads to AV conduction disturbances, diminution in P-wave amplitude, and widening of the QRS interval. Severe hyperkale

Question 13

ECG changes in hypertrophic cardiomyopathy may simulate ?

A	Anterior MI
B	Lateral MI
C	Inferior MI
D	All of the above

Question 14

QRS & QT prolongation along with sinus tachycardia can be seen in ?

A	Tricyclic antidepressant overdose
B	Quinidine excess
C	Subarachnoid hemorrhage
D	Hyperkalemia

Question 14 Explanation:

Drugs that prolong QT are quinidine, disopyramide, procainamide, tricyclic antidepressants, phenothiazines, amiodarone, sotalol, ibutilide. QRS & QT prolongation along with sinus tachycardia occur in tricyclic antidepressant overdose.

Question 15

“CVA T-wave” pattern consists of all except ?

A	“CVA T-wave” pattern consists of all except ?
B	Marked PR prolongation
C	Deep T-wave inversions
D	Wide T-wave inversions

Question 15 Explanation:

Marked QT prolongation, with deep & wide T-wave inversions occur with intracranial bleeds, particularly subarachnoid hemorrhage and are called as “CVA T-wave” p

Question 16

Systemic hypothermia prolongs ?

A	Depolarization
B	Repolarization
C	Depolarization + repolarization
D	None of the above

Question 16 Explanation:

Systemic hypothermia also prolongs repolarization with a distinctive convex elevation of the J point called Osborn wave.

Question 17

Which of the following prolongs the QT interval ?

A	Hypothermia
B	Hypokalemia
C	Hypocalcemia
D	All of the above

Question 18

Abbreviation of ST segment and shortening of QT interval is found in ?

A	Hypocalcemia
B	Hypercalcemia
C	Hyponatremia
D	Hyponatremia

Question 18 Explanation:

Hypocalcemia typically prolongs the QT interval (ST portion), while hypercalcemia shortens it

Question 19

Which of the following shortens the QT interval ?

A	Digitalis
B	Disopyramide
C	Ibutilide
D	Procainamide

Question 19 Explanation:

Procainamide

Question 20

Q waves in ECG can be seen in all of the following except ?

A	Sarcoidosis
B	Scleroderma
C	SLE
D	SLE

Question 21

Q waves in ECG can be seen in all of the following except ?

A	Left pneumothorax
B	Dextrocardia
C	Long QT syndrome
D	Wolff-Parkinson-White syndrome

Question 22

In ECG, transient nonspecific repolarization changes occur following all except ?

A	Meals
B	Postural (orthostatic) change
C	Hyperventilation
D	Sleep

Question 22 Explanation:

Transient nonspecific nonspecific ST–T-wave repolarization changes may occur following a meal or with postural (orthostatic) change, hyperventilation, or exercise in healthy individuals

Question 23

In ECG, total electrical alternans (P-QRS-T) with sinus tachycardia is a relatively specific sign of ?

A	Myocardial ischemia
B	Myocarditis
C	Myocarditis
D	Myocarditis

Question 23 Explanation:

Total electrical alternans (P-QRS-T) with sinus tachycardia (beat-to-beat alternation in one or more components of ECG) is a relatively specific sign of pericardial effusion with cardiac tamponade due to periodic swinging motion of heart in effusion at a frequency exactly half of heart rate.

Question 24

Repolarization (ST-T or U wave) alternans is a sign of ?

A	Mechanical instability of heart
B	Mechanical instability of heart
C	Serious pulmonary disease
D	Serious pulmonary disease

Question 25

Chronic renal failure (CRF) is suspected if ECG shows ?

A	Peaked T waves
B	Long QT
C	Left ventricular hypertrophy (LVH)
D	All of the above

Question 25 Explanation:

CRF can have the following ECG features as a triad - peaked T waves (hyperkalemia), long QT due to ST segment lengthening (hypocalcemia) & LVH (systemic hypertension)

Question 26

“Persistent juvenile T-wave pattern” consists of ?

A	T-wave inversions in leads V1 - V3
B	T-wave inversions in leads V1 - V4
C	T-wave inversions in leads V1 - V5
D	T-wave inversions in leads V1 - V6

Question 26 Explanation:

“Persistent juvenile T-wave pattern” a normal variant in healthy young adult woman consisting of T-wave inversions in leads V 1 - V3.

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See all quizzes of the Electrocardiography at here:

Electrocardiography- Part 1 | Electrocardiography- Part 2 | Electrocardiography- Part 3

1.Alternation of right & left bundle branch block is a sign of ?
A. Bifascicular disease
B. Trifascicular disease
C. Complete heart block
D. AV Dissociation

3. Intraventricular conduction delays can be caused by ?
A. Hyperkalemia
B. Tricyclic antidepressants
C. Phenothiazines
D. All of the above

4. Which of the following is diagnostic of Wolff-Parkinson-White syndrome ?
A. Wide QRS complex
B. Relatively short PR interval
C. Slurring of initial part of QRS (delta wave)
D. All of the above

5. Which of the following about myocardial ischemia is false ?
A. Complex time-dependent effects on electrical properties of
myocardial cells
B. Severe, acute ischemia lengthens duration of action potential
C. Cause a voltage gradient between normal & ischemic zones
D. Leads to flow of currents of injury

6. Wellens T waves are usually associated with ?
A. Stenosis of left anterior descending coronary artery
B. Stenosis of posterior descending coronary artery
C. Stenosis of left circumfles coronary artery
D. Stenosis of right coronary artery

7. Atrial infarction may be associated with ?
A. PR-segment deviations
B. Changes in P-wave morphology
C. Atrial arrhythmias
D. All of the above

8. Diagnostic changes of acute or evolving ischemia are masked by ?
A. Left bundle branch block
B. Electronic ventricular pacemaker patterns
C. WPW preexcitation
D. All of the above

9. Osborn wave in ECG is found in ?
A. Heat stroke
B. Hypothermia
C. Cerebrovascular accident
D. Pneumothorax

10. ST-segment elevations simulating ischemia may occur with ?
A. Hypercalcemia
B. Hyperkalemia
C. Hypothermia
D. All of the above

11. ST-segment elevations simulating ischemia may occur with ?
A. Acute pericarditis
B. Myocarditis
C. Brugada syndrome
D. All of the above

12. Tall, positive T waves are seen in ?
A. Hyperkalemia
B. Cerebrovascular injury
C. Left ventricular volume overload (MR or AR)
D. All of the above

13.The first ECG change in hyperkalemia is ?
A. Diminution in P-wave amplitude
B. Narrowing & peaking (tenting) of T waves
C. Widening of QRS interval
D. AV conduction disturbances
ECG changes in hyperkalemia usually begin with narrowing and peaking (tenting) of the T

14. ECG changes in hypertrophic cardiomyopathy may simulate ?
A. Anterior MI
B. Lateral MI
C. Inferior MI
D. All of the above

15. QRS & QT prolongation along with sinus tachycardia can be seen in ?
A. Tricyclic antidepressant overdose
B. Quinidine excess
C. Subarachnoid hemorrhage
D. Hyperkalemia

16. “CVA T-wave” pattern consists of all except ?
A. Marked QT prolongation
B. Marked PR prolongation
C. Deep T-wave inversions
D. Wide T-wave inversions

17. Systemic hypothermia prolongs ?
A. Depolarization
B. Repolarization
C. Depolarization + repolarization
D. None of the above

18. Which of the following prolongs the QT interval ?
A. Hypothermia
B. Hypokalemia
C. Hypocalcemia
D. All of the above

19. Abbreviation of ST segment and shortening of QT interval is found in ?
A. Hypocalcemia

B. Hypercalcemia
C. Hyponatremia
D. Hyperkalemia

20. Which of the following shortens the QT interval ?
A. Digitalis
B. Disopyramide
C. Ibutilide
D. Procainamide

21. Q waves in ECG can be seen in all of the following except ?
A. Sarcoidosis
B. Scleroderma
C. SLE
D. Chagas’ disease

22. Q waves in ECG can be seen in all of the following except ?
A. Left pneumothorax
B. Dextrocardia
C. Long QT syndrome
D. Wolff-Parkinson-White syndrome

23. In ECG, transient nonspecific repolarization changes occur following all except ?
A. Meals
B. Postural (orthostatic) change
C. Hyperventilation
D. Sleep

24. In ECG, total electrical alternans (P-QRS-T) with sinus tachycardia is a relatively specific sign of ?
A. Myocardial ischemia
B. Myocarditis
C. Pericardial effusion
D. Pneumothorax

25. Repolarization (ST-T or U wave) alternans is a sign of ?
A. Mechanical instability of heart
B. Electrical instability of heart
C. Serious pulmonary disease
D. Serious hepatic disease

26. Chronic renal failure (CRF) is suspected if ECG shows ?
A. Peaked T waves
B. Long QT
C. Left ventricular hypertrophy (LVH)
D. All of the above

27. “Persistent juvenile T-wave pattern” consists of ?
A. T-wave inversions in leads V1 – V3
B. T-wave inversions in leads V1 – V4
C. T-wave inversions in leads V1 – V5
D. T-wave inversions in leads V1 – V6

Electrocardiography

[MCQ] Electrocardiography- Part 3

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Electrocardiography- Part 3

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