ECG Quiz

Question 1

lead 1

Answer 1

0 degrees
(-) to (+)
right arm to left arm

Question 2

lead 2

Answer 2

60 degrees
best lead for QRS complex
(-) to (+)
right arm to left leg

Question 3

lead 3

Answer 3

120 degrees
(-) to (+)
left arm to left leg

Question 4

aVR

Answer 4

augmented lead of right arm

-150 degrees

Question 5

aVL

Answer 5

augmented lead of left arm

-30 degrees

Question 6

aVF

Answer 6

augmented lead of foot

+90 degrees

Question 7

augmented leads

Answer 7

tell you where the positive charge is and the negative charge is the average of the other leads

Question 8

precordial leads

Answer 8

V1-V6
placed on the chest wall around the heart
negative electrode is the center of the heart
give a transverse view

Question 9

Phase of ventricular cardiomyocyte depolarization

Answer 9

phase 0-2

QRS complex

Question 10

phase of ventricular cardiomyocyte repolarization

Answer 10

phase 3

T-wave

Question 11

each small mark on the graph=

Answer 11

1mm

Question 12

how many small marks is a large box

Answer 12

5mm or 0.5 mV

0.2 seconds

Question 13

y axis

Answer 13

1mm or 0.1 mV

Question 14

x axis

Answer 14

1 mm= 0.04 seconds

Question 15

5 large boxes=

Answer 15

1 second

Question 16

how long is the PR interval

Answer 16

0.16 seconds

Question 17

how long is a normal QRS duration

Answer 17

0.12 seconds= 3 small boxes

Question 18

normal P-R interval (P-Q)

Answer 18

<0.2 seconds

1 big box

Question 19

R-R interval

Answer 19

measures heart rate

calculate: 300/ # of big boxes