Wk 1 EKG practice questions

Question 1

What represents the depolarization of the atria on the EKG?
a) QRS complex
b) ST segment
c) P wave
d) PR segment
e) Not visible on EKG

Answer 1

c) P wave

Question 2

What does the ST segment represent?
a) Depolarization of the atria
b) Depolarization of the ventricles
c) AV node pause
d) Ventricular refractory period

Answer 2

d) Ventricular refractory period

Question 3

Where is the AV node pause represented?
a) QRS complex
b) ST segment
c) PR segment
d) Not visible on EKG

Answer 3

c) PR segment

Question 4

Which of the following is NOT a key player during ventricular depolarization?
a) AV node
b) Bundle of His
c) Bundle branches
d) Terminal Purkinje fibers

Answer 4

a) AV node

Question 5

What 3 leads constitute looking at the heart from an inferior perspective?
a) II, III, aVF
b) I, III, aVF
c) II, III, aVL
d) II, III, aVF

Answer 5

a) II, III, aVF

Question 6

What 4 leads constitute looking at the heart from a left lateral perspective?
a) II, aVL, V4, V6
b) I, aVL, V5, V6
c) I, aVF, V5, V6
d) II, aVF, V4, V6

Answer 6

b) I, aVL, V5, V6

Question 7

What are the 3 anterior leads?
a) I, II, III
b) V3, V4, V5
c) V2, V3, V4
d) V2, aVL, avF

Answer 7

c) V2, V3, V4

Question 8

What perspective does V1 look at the heart?
a) Anterior
b) Inferior
c) Left lateral
d) Right ventricular

Answer 8

d) Right ventricular

Question 9

One small box on the EKG represents what duration?
a) 0.02 sec
b) 0.04 sec
c) 0.4 sec
d) 1 sec

Answer 9

b) 0.04 sec

Question 10

What equals 1 sec on an EKG?
1 small square
2 large squares
5 large squares
15 small squares

Answer 10

5 large squares

Question 11

What equals 1mV on an EKG?
2 large squares
1 large square
10 small squares
5 large squares

Answer 11

2 large squares

Question 12

How many small squares are in a large square on an EKG?
5
10
15
20

Answer 12

5

Question 13

A wave of depolarization (mean vector or electrical axis) toward a positive lead is represented graphically as what?
a) A positive (upward) deflection
b) A negative (downward) deflection
c) A horizontal line
d) QRS complex

Answer 13

a) A positive (upward) deflection

Question 14

The SA node is located in the ____________, therefore this area depolarizes 1st.
a) Right ventricle
b) Right atrium
c) Left ventricle
d) Left atrium

Answer 14

b) Right atrium

Question 15

True or false: Once right and left atrial depolarization complete, the EKG is NOT electrically silent (flat).

Answer 15

False

Question 16

The P wave is usually most positive in lead ____ and most negative in lead _____.
a) 1; aVR
b) aVR; 2
c) 2; aVR
d) 3; aVF

Answer 16

c) 2; aVR