Quiz 5 EKG

Question 1

Each small box on the EKG is how many seconds?

Answer 1

.04 seconds, 1mm (mV) vertically

Question 2

Towards a positive electrode, there is a ________ slope

Answer 2

upward

Question 3

Towards a negative electrode, there is a ________ slope

Answer 3

downwards

Question 4

EKG electrodes record an __________ current of flow at anytime

Answer 4

average

Question 5

Limb Leads include

Answer 5

I, II, III, AVF, AVL, AVR

Question 6

Chest Leads include

Answer 6

V1, V2, V3, V4, V5, V6

Question 7

Leads I, II, III correspond with what angles?

Answer 7

Lead I - 0 degrees

Lead II- 60 degrees

Lead III- 120 degrees

Question 8

Leads AVL, AVR, and AVF correspond with what angles?

Answer 8

Lead AVL: -30 degrees

Lead AVR: -150 degrees

Lead AVF: 90 degrees

Question 9

Lateral Leads include

Answer 9

Lead I and AVL

Question 10

Inferior Leads include

Answer 10

II, III, AVF

Question 11

Leads V1 and V2 correspond with

Answer 11

the RIght side of the Heart

Question 12

Leads V3 and V4 correspond with the

Answer 12

Interventricular Septum

Question 13

Leads and V5 and V6 correspond with

Answer 13

the Left Ventricle

Question 14

Leads that correspond with the Anterior portion of the heart include

Answer 14

V2, V3, V4

Question 15

Leads that correspond with the Left Lateral portion of the heart include:

Answer 15

I, AVL, V5, V6

Question 16

Leads that correspond with the Inferior portion of the heart:

Answer 16

II, III, AVF

Question 17

Leads that correspond with the Right Ventricular portion of the heart include:

Answer 17

AVR, V1

Question 18

What wave represents depolarization of both atria?

Answer 18

P-wave

Left half- right atrial depolarization

Right half- left atrial depolarization

Question 19

Normal limits of the p wave:

Answer 19

should not exceed 0.12 seconds or .25 mm amplitude

Question 20

Best place to see a p-wave (most positive) is in what lead?

In which lead is the p-wave biphasic? and what can this tell us?

Answer 20

Best place to see P-wave: Lead II

Biphasic P-wave: V1, tells us what side is hypertrophied

Question 21

A normal PR interval is

Answer 21

.12 - .20 seconds

Question 22

Are Q,R,S waves + or -

Answer 22

Q wave: first - wave after p wave

R wave: 1st + wave after Q wave

S wave: 1st - wave after R wave

Question 23

Normal QRS interval is

Answer 23

.06 - .1 seconds

Question 24

A QRS may be pathologic if it is > than

Answer 24

.08 - .12 seconds long

Question 25

All QRS should be _______ in all limb leads besides AVR.

Answer 25

positive

Question 26

The T wave represents

Answer 26

ventricular repolarization

Question 27

The S-T segment represents the

Answer 27

ventricular refractory period (should be isoelectric)

Question 28

The upper limit of the QT interval is _____ seconds and it is based on ______

Answer 28

0.42 seconds, based on Heart Rate

Question 29

If a QTc is > 0.5 seconds it indicates

Answer 29

an increased likeliness of ventricular arrythmias

Question 30

Axis deviation will occur if:

Answer 30

• hypertrophy: will move towards hypertrophy side
• Infarct: moves away from infarction

Question 31

What quadrant corresponds with what axis deviation?

Answer 31

I

I

I

I

I

LUQ: 180- (-90) degrees- Extreme RAD

RUQ: 0 - (-)90 degrees- LAD

LLQ: 90- 180 degrees- RAD

RLQ: 0-90 degrees- Normal

Question 32

How to calculate HR using ‘boxes’ method:

Answer 32

300-150-100-75-60