ch.2: recording the EKG

Question 1

How big are the smaller squares on EKG paper?

Answer 1

1 millimeter (mm) squares

Question 2

how big are the darker boxes on EKG paper?

Answer 2

5 small squares long and each side is 5 mm long

Question 3

what is 10 mm in y-axis?

Answer 3

1 millivolt (mV) or 2 big boxes

Question 4

is upward deflection positive or negative?

Answer 4

positive (y-axis)

Question 5

is downward deflection positive or negative?

Answer 5

negative (y-axis)

Question 6

what are the boxes measured as?

Answer 6

millimeters

Question 7

what is measured in the x-axis?

Answer 7

horizontal axis = time

Question 8

what time does the paper run at?

Answer 8

25 mm/sec

Question 9

how long is each 1 mm?

Answer 9

0.04 sec

Question 10

how long (time) are the big squares?

Answer 10

• 0.2 seconds
• 5 sq of 1 mm x 1 mm
• 5 x 0.04 s = 0.2 sec

Question 11

what does time show on an EKG?

Answer 11

duration of any segment of a cardiac cycle

Question 12

What are the 4 limb electrodes?

Answer 12

• Right arm
• Left arm
• Right leg
• Left leg

Question 13

What are the 6 chest electrodes?

Answer 13

V1 to V6

Question 14

What does the V represent?

Answer 14

chest leads

Question 15

RA

Answer 15

Near right shoulder, off of deltoid just under the distal right clavicle

Question 16

LA

Answer 16

Near left shoulder, off of deltoid just under the distal left clavicle

Question 17

RL

Answer 17

Above the right hip, may want to move up to the base of the ribs to avoid body fat and the movement during exercise

Question 18

LL

Answer 18

Above the left hip, may want to move up to the base of the ribs to avoid body fat and the movement during exercise

Question 19

V1

Answer 19

Fourth intercostal space on the right sternal border

Question 20

V2

Answer 20

Fourth intercostal space on the left sternly border

Question 21

V3

Answer 21

Halfway between V2 and V4, off of the pectoral muscle and breast tissue

Question 22

V4

Answer 22

Fifth intercostal space on the left, mid-clavicular line, off of the pectoral muscle and/or breast tissue

Question 23

V5

Answer 23

Left anterior axillary line at the same level as V4

Question 24

V6

Answer 24

Left mid axillary line at the same level as V4 and V5

Question 25

Lead I

Answer 25

• Left arm positive
• Right arm negative

Question 26

Lead II

Answer 26

• Left leg positive
• Right arm negative

Question 27

Lead III

Answer 27

• Left arm negative
• Left leg positive

Question 28

What are the 3 unipolar limb leads?

Answer 28

• AVF
• AVR
• AVL

Question 29

What does AV mean?

Answer 29

Augmented voltage

Question 30

What are the bipolar limb leads?

Answer 30

• Lead I
• Lead II
• Lead III