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040-444

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(From Goldberger AL: Clinical Electrocardiography: A Simplified Approach, 6th ed. St. Louis, Mosby, 1999, p 70.)

Answer: C

QUESTION: 356

Subendocardial ischemia usually produces

1. ST-segment elevation.

2. ST -segment depression.

3. Q waves.

4. U waves.

Answer: B

QUESTION: 357

In the ECG strip shown below, which arrhythmia is present?

1. Premature ventricular contractions.

2. Ventricular tachycardia.

3. Ventricular trigeminy.

4. Ventricular bigeminy.

(From Goldberger AL: Clinical Electrocardiography: A Simplified Approach, 6th ed. 51.

Louis, Mosby, 1999, p 167.)

Answer: B

QUESTION: 358

In the ECG strip shown below, which arrhythmia is indicated?

1. Atrial flutter.

2. Atrial fibrillation.

3. Premature atrial contractions.

4. Atrial tachycardia.

Answer: A

QUESTION: 359

Abnormally tall and peaked T waves suggest which of the following?

1. Hyperkalemia.

2. Acute pericarditis.

3. Acute MI.

4. Hypokalemia.

Answer: A

QUESTION: 360

Which of the following conditions can prolong the QT interval?

1. Hypokalemia and hypercalcemia.

2. Hyperkalemia and hypercalcemia.

3. Hypocalcemia and hypokalemia.

4. Hypocalcemia and hyperkalemia.

Answer: D

QUESTION: 361

Differentiation between supraventricular and ventricular rhythm is made on the

basis of the

1. Duration (width) of the QRS complex and the presence or absence of P waves.

2. Appearance of the ST segment.

3. Amplitude of the U wave.

4. Duration of the PR interval.

Answer: A

QUESTION: 362

Which of the following is one cause of a wide QRS complex?

1. Hypokalemia.

2. Defective intraventricular conduction.

3. Right atrial enlargement.

4. Abnormal ST segment

Answer: B

QUESTION: 363

In response to various stimuli, movements of ions occur, causing the rapid loss of the internal negative potential. This process is known as

1. Polarization.

2. Repolarization.

3. Automaticity.

4. Depolarization.

Answer: D

QUESTION: 364

Digitalis effect refers to

1. Scooped-out depression of the ST segment produced by digitalis.

2. Elevation of the PR interval produced by digitalis.

3. Shortening of the QT interval produced by digitalis.

4. Prolongation of the QRS complex produced by digitalis.

Answer: A

QUESTION: 365

Tall, positive T waves may be caused to all of the following EXCEPT

1. Hyperacute phase of MI.

2. LVH.

3. Acute pericarditis.

4. Hypocalcemia.

Answer: D

QUESTION: 366

In the ECG strip sho'ATI1 below, what abnormalities are indicated?

1. Left atrial enlargement and LVH.

2. Right atrial enlargement and right ventricular hypertrophy.

3. Left anterior fascicular block and left posterior h,scicular block.

4. Subendocardial ischemia and infarction

Avr V1 V4

Avl V2 V5

Avf V3 V6

Answer: A

QUESTION: 367

Right-axis deviation may be caused by

1. Acute pericarditis.

2. Right atrial enlargement.

3. Chronic obstructive pulmonary disease.

4. Cardiomyopathy.

Answer: C

QUESTION: 368

In atrial flutter, the stimulation rate is approximately

1. 75 bpm

2. 125 bpm

3. 200 bpm

4. 300 bpm

Answer: D

QUESTION: 369

Myocardial cells can be excited in response to all of the following stimuli EXCEPT:

1. Electrical

2. Chemical

3. Mechanical

4. Emotional

Answer: D

QUESTION: 370

The P wave on the ECG can be

1. Negative

2. Positive

3. Isoelectric

4. Either positive or negative

Answer: D

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