EKG Leads & Paper

Question 1

An EKG represents the ____1____ ____2____ of the heart, ___3___ the ______4______ of the heart.

Answer 1

1. Electrical
2. Activity
3. NOT
4. Contraction

Question 2

Condition: ST segment elevation

Answer 2

Infarction

Question 3

List the systematic order in which to look through an EKG (3)

Answer 3

1. Rate
2. Axis
3. Interval/Rhythm

Question 4

Structure: Pacemaker of the heart

Answer 4

SA node [60-100 bpm]

Question 5

List values for bradycardia and tachycardia and why those conditions are concerning.

Answer 5

Bradycardia < 60 bpm; Tachycardia > 100 bpm

In both cardiac function is compromised, there is decrased blood/O2 to tissue

However, bradycardia is not a problem for athletes b/c they have increased SV

Question 6

List the:

1. Limb leads
2. Augmented voltage leads
3. Precordial leads

Answer 6

1. I, II, III
2. aVR, aVL, aVF [left, right, foot]
3. V1-V6

Question 7

Lead: Record the difference in electrical potential between a positive and negative charge. The negative is used as a reference.

Answer 7

Limb Leads

Question 8

In limb lead I the left arm is __1__, and the right arm is __2__. In limb lead II the left leg is __3__, and the right arm is __4__. In limb lead III the left leg is __5__, and the left arm is __6__. In all limb leads the right leg is the _____7_____.

Answer 8

1. Positive
2. Negative
3. Positive
4. Negative
5. Positive
6. Negative
7. Ground

Question 9

Is a potential is heading toward a positive electrode there will be an _____1_____ deflection on the EKG, if a potential is heading away from a positive electrode or ____2____ a _____3_____ electrode there will be a _____4_____ deflection on the EKG

Answer 9

1. Upward
2. Toward
3. Negative
4. Downward

Question 10

Limb leads are __________ while augmented voltage and precordial leads are ____________.

Answer 10

Bipolar, Unipolar

Question 11

In Einthoven’s Triangle limbs leads I, II, III intersect at the ____ ______.

Answer 11

AV node

Question 12

In general, electrical activity of the heart is moving toward the ___1___ foot, or ___2___ and ___3___.

Answer 12

1. Left
2. Down
3. Left

Due to the distribution of mm mass and orientation of the heart

Question 13

Typically, infections in aVR are ______1______, if aVR is ____2____ this indicated _____3_____.

Answer 13

1. Inverted
2. Upright
3. MI (dead tissue)

Question 14

_________ leads provide a snap shot picture of the heart in an _____ direction.

Answer 14

Precordial, A/P

Question 15

In __________ there is a small R wave; the R wave gets _________ as we go around the heart.

Answer 15

V1-V2; Bigger

Question 16

List the leads for the following areas of the heart

1. Inferior
2. Septa
3. Anterior
4. Lateral

**There is some overlap of the areas**

Answer 16

1. II, III, aVF
2. V1, V2
3. V3, V4,
4. I, aVL, V5, V6

Question 17

EKG paper has 1 _____1_____ small squares, so height and depth of wave is measured in _____2_____. The horizontal axis is ___3___. Paper moves at a speed of _____4_____, so __5__ seconds for each small box. 1 large box is _6_ small boxes or ___7___ sec.

Answer 17

1. Millimeter
2. Millimeters
3. Time
4. 25 mm/sec
5. 0.04
6. 5
7. 0.2

Question 18

List 2 ways to calculate heart rate from an EKG strip

Answer 18

1. Count the number of cardiac cycles in a 6 sec strip and multiple by 10 [FOR IRREGULAR RATE]
2. Find a R wave on a heavy line and count the number of large boxes to the next R wave. Each box represents a certain rate [FOR REGULAR RATE]

Question 19

List the order of heart rate in the box couting method

Answer 19

300 > 150 > 100 > 75 > 60 > 50

Question 20

Define cardiac cycle

Answer 20

From R wave to R wave [spaces b/t R waves]