CARDIO HW 1d

Question 1

The firing of an artificial ventricular pacemaker causes:
Choose one answer.
A. a change in the shape of the preceding P waves.
B. a vertical spike followed by a wide QRS complex.
C. a small spike followed by a narrow QRS complex.
D. a wide QRS complex followed by a vertical spike.

Answer 1

B

Question 2

The inferior wall of the left ventricle is supplied by the:
Choose one answer.
	 A. right coronary artery.  	
	 B. left coronary artery.  	
	 C. circumflex artery.  	
	 D. left anterior descending artery

Answer 2

A

Question 3

The layers of the wall of the heart, beginning with the outermost layer, are the:
Choose one answer.
A. epicardium, myocardium, and endocardium.
B. endocardium, epicardium, and myocardium.
C. myocardium, epicardium, and endocardium.
D. epicardium, endocardium, and myocardium.

Answer 3

A

Question 4

The left main coronary artery subdivides into the:
Choose one answer.
A. left anterior ascending and descending arteries.
B. left anterior descending and circumflex arteries.
C. left posterior ascending and circumflex arteries.
D. right coronary and left posterior descending arteries.

Answer 4

B

Question 5

The Levine sign is defined as:
Choose one answer.
A. pushing on the sternum with the fingertips.
B. rubbing the arm to which pain is radiating.
C. a subconsciously clenched fist over the chest.
D. a state of denial in patients with an acute myocardial infarction.

Answer 5

C

Question 6

The mitral valve:
Choose one answer.
A. is located on the higher-pressure side of the heart.
B. separates the right atrium from the right ventricle.
C. prevents blood regurgitation into the left ventricle.
D. is a tricuspid valve located on the right side of the heart.

Answer 6

A

Question 7

The normal P wave duration is less than \_\_\_ milliseconds and the amplitude is less than \_\_\_ millimeters tall.
Choose one answer.
	 A. 110; 2.5  	
	 B. 120; 3.0  	
	 C. 130; 3.5  	
	 D. 140; 4.0

Answer 7

A

Question 8

The P wave represents:
Choose one answer.
	 A. SA nodal discharge.  	
	 B. atrial depolarization.  	
	 C. a delay at the AV node.  	
	 D. contraction of the atria.

Answer 8

B

Question 9

The PR interval should be no shorter than \_\_\_\_ seconds and no longer than \_\_\_\_ seconds in duration.
Choose one answer.
	 A. 0.12, 0.20  	
	 B. 0.14, 0.30  	
	 C. 0.16, 0.40  	
	 D. 0.18, 2.0

Answer 9

A

Question 10

The precordial leads do NOT view the \_\_\_\_\_\_\_\_\_\_ wall of the heart.
Choose one answer.
	 A. septal  	
	 B. inferior  	
	 C. anterior  	
	 D. lateral

Answer 10

B

Question 11

The presence of a J wave (Osborn wave) on the ECG is an indicator of:
Choose one answer.
	 A. a delta wave.  	
	 B. hyponatremia.  	
	 C. hypercalcemia.  	
	 D. hypothermia.

Answer 11

D

Question 12

The QT interval would MOST likely be prolonged in patients:
Choose one answer.
	 A. who take digitalis.  	
	 B. who are hypocalcemic.  	
	 C. with a rapid heart rate.  	
	 D. who are hypercalcemic.

Answer 12

B

Question 13

The right atrium, right ventricle, and part of the left ventricle are supplied by the:
Choose one answer.
	 A. circumflex artery.  	
	 B. left anterior descending artery.  	
	 C. left main coronary artery.  	
	 D. right coronary artery.

Answer 13

D

Question 14

The S1 heart sound represents:
Choose one answer.
A. closure of the mitral and tricuspid valves.
B. the end of ventricular contraction.
C. closure of the aortic and pulmonic valves.
D. the beginning of atrial contraction.

Answer 14

A

Question 15

The SA node:
Choose one answer.
A. cannot depolarize faster than 100 times/min.
B. will outpace any slower conduction tissue.
C. functions as the heart’s secondary pacemaker.
D. has an intrinsic firing rate of 40 to 60 times per minute

Answer 15

B

Question 16

The \_\_\_\_\_\_\_\_\_\_ represents the end of ventricular depolarization and the beginning of repolarization.
Choose one answer.
	 A. J point  	
	 B. T wave  	
	 C. ST segment  	
	 D. T-P interval

Answer 16

A

Question 17

Torsade de pointes:
Choose one answer.
A. presents with wide QRS complexes that are all of the same shape, size, and vector direction.
B. is a lethal ventricular rhythm that is usually caused by ingestion or injection of CNS-depressant drugs.
C. is generally less serious than monomorphic ventricular tachycardia and is usually not treated in the field.
D. is a variant of polymorphic ventricular tachycardia and is often caused by a prolonged QT interval.

Answer 17

D

Question 18

When applying the limb leads, the negative lead should be placed on the:
Choose one answer.
	 A. left arm.  	
	 B. left leg.  	
	 C. right arm.  	
	 D. right leg

Answer 18

C

Question 19

When applying the precordial leads, lead V1 should be placed in the:
Choose one answer.
A. fourth intercostal space at the right sternal border.
B. fourth intercostal space at the left sternal border.
C. fifth intercostal space at the left midclavicular line.
D. fourth intercostal space at the left midclavicular border.

Answer 19

A

Question 20

When monitoring a patient’s cardiac rhythm, it is MOST important to remember that:
Choose one answer.
A. a heart rate below 60 beats per minute must be treated immediately.
B. many patients with acute myocardial infarction experience asystole.
C. the ECG does not provide data regarding the patient’s cardiac output.
D. the presence of a QRS complex correlates with the patient’s pulse.

Answer 20

C

Question 21

When viewing leads V3 and V4, you are looking at the \_\_\_\_\_\_\_\_\_ wall of the \_\_\_\_\_\_\_\_\_.
Choose one answer.
	 A. septal, heart.  	
	 B. lateral, left ventricle.  	
	 C. anterior, left ventricle.  	
	 D. inferior, right ventricle.

Answer 21

C

Question 22

Which of the following blood pressure readings is MOST suggestive of a patient who has arteriosclerosis?
Choose one answer.
	 A. 140/90 mm Hg  	
	 B. 150/80 mm Hg  	
	 C. 160/70 mm Hg  	
	 D. 180/110 mm Hg

Answer 22

C

Question 23

Which of the following chemicals or drugs causes an increase in heart rate?
Choose one answer.
	 A. Norepinephrine  	
	 B. Cholinesterase  	
	 C. Atenolol and neostigmine  	
	 D. Atropine and epinephrine

Answer 23

D

Question 24

Which of the following drugs is contraindicated in patients with asthma?
Choose one answer.
	 A. Albuterol  	
	 B. Adrenaline  	
	 C. Norepinephrine  	
	 D. Propranolol

Answer 24

D

Question 25

Which of the following drugs possesses beta-2-specific properties?
Choose one answer.
	 A. Dopamine  	
	 B. Levophed  	
	 C. Proventil  	
	 D. Epinephrine

Answer 25

C

Question 26

Which of the following ECG waveforms represents ventricular depolarization?
Choose one answer.
	 A. T wave  	
	 B. ST segment  	
	 C. QRS complex  	
	 D. U wave

Answer 26

C

Question 27

Which of the following mechanisms causes hypertension?
Choose one answer.
A. Arteriosclerosis results in increased elasticity of the arteries, causing vasodilation and increased arteriolar capacity.
B. Atherosclerotic plaque narrows one or more of the coronary arteries, resulting in increased cardiac perfusion.
C. Increased afterload stimulates the Frank-Starling reflex, which raises the pressure behind the blood leaving the heart.
D. Heart rate that is persistently above 80 beats/min causes an increase in cardiac output and a resultant increase in blood pressure

Answer 27

C