EKG - Quiz 1

Question 1

P wave due to

Answer 1

• atrial depolarization

atrial systole

Question 2

atrial repolarization

Answer 2

• masked by QRS complex

Question 3

PR interval

Answer 3

• time from start of atrial depolarization to start of ventricular depolarization

Question 4

QRS complex

Answer 4

• ventricular depolarization

Question 5

QT interval

Answer 5

• from start of QRS to end of T wave

Question 6

T wave

Answer 6

• ventricular repolarization

Question 7

PR segment

Answer 7

• slow propagation through the AV node

Question 8

Q wave results from

Answer 8

• normal spread of depolarization in the interventricular septum

Question 9

R wave results from

Answer 9

• spread of depolarization through ventricular myocardium

Question 10

S wave represents

Answer 10

• later stages of ventricular depolarization

Question 11

ST segment represents

Answer 11

• the time when most of the ventricular muscle is depolarized

Question 12

one large horizontal division on the ECG

Answer 12

• 0.2 seconds

Question 13

one small horizontal division on the ECG

Answer 13

• 0.04 seconds

Question 14

PR interval normal duration

Answer 14

• 0.12-0.2 seconds

Question 15

duration of QRS complex

Answer 15

• less than 0.1 sec

Question 16

good rule of thumb about time of QT interval

duration

Answer 16

• half length of R-R interval

- 0.36-.44

Question 17

how to check for rhythm

Answer 17

• check P before each QRS
• check to make sure both II and avF are pointing up
• make sure each is spaced out currently

Question 18

how to calculate QTc

Answer 18

QTc = QT/√R-R interval (where R-R interval = 60/HR)

Question 19

angle of lead II

Answer 19

60

Question 20

angle of AVF

Answer 20

90

Question 21

angle of lead III

Answer 21

120

Question 22

angle of lead I

Answer 22

0

Question 23

angle of AVL

Answer 23

-30

Question 24

angle of AVR

Answer 24

-150

Question 25

how to check for axis

Answer 25

• look at lead I and aVF