EKG

Question 1

How many electrodes are placed on a 12 lead EKG

Answer 1

10

Question 2

How much does one small square measure in the EKG paper

Answer 2

1 mm X 1 mm

Question 3

What does the horizontal axis display

Answer 3

Time

Question 4

What does the vertical axis display

Answer 4

gain or amplitude

Question 5

How much does a small vertical square represent

Answer 5

0.1 mV

Question 6

How much odes a small horizontal square represent

Answer 6

0.04 seconds

Question 7

What is the normal speed the EKG paper should run

Answer 7

25 mm/sec

Question 8

What is the normal gain or amplitude of the paper

Answer 8

10 mm or 1 mV

Question 9

Which leads are bipolar

Answer 9

I, II, III

Question 10

Which leads are unipolar

Answer 10

aVL, aVR, aVF

Question 11

Which are the precordial leads

Answer 11

V1-V6

Question 12

Placement of V1

Answer 12

right side of the sternum at the fourth intercostal space

Question 13

Placement of V2

Answer 13

left side of the sternum at the fourth intercostal space

Question 14

Placement of V3

Answer 14

Midway between V2 and V4

Question 15

Placement of V4

Answer 15

Left side of the chest fifth intercostal space, midclavicular line

Question 16

Placement of V5

Answer 16

Left side of the chest, fifth intercostal space, anterior axillary line

Question 17

Placement of V6

Answer 17

Left side of the chest, fifth intercostal space, midaxillary line

Question 18

What does the P wave represent

Answer 18

Atrial depolarization or contraction

Question 19

What does the QRS complex represent

Answer 19

Ventricular depolarization or contraction

Question 20

What does the T wave represent

Answer 20

Ventricular repolarization or relaxation

Question 21

What does the U wave represent

Answer 21

Not always visible but represents a repolarization of the bundle of His and Purkinge fibers.

Question 22

PR interval

Answer 22

Starts at the beginning of the P wave and ends at the beginning of the Q wave. Represents the time it takes from the beginning of atrial depolarization to the beginning of ventricular depolarization.

Question 23

QT interval

Answer 23

Starts at the beginning of the Q wave and ends at the end of the T wave. Represents the time it takes from the beginning of ventricular depolarization to the end of ventricular repolarization.

Question 24

ST segment

Answer 24

Starts at the end of the S wave and ends at the beginning of the T wave. Represents the time from the end of ventricular depolarization to the beginning of ventricular repolarization.

Question 25

What is electrocardiography

Answer 25

The process of recording an electrocardiogram

Question 26

Somatic tremor

Answer 26

Characterized by irregular spikes throughout the tracing and is related to muscle movement

Question 27

AC interference

Answer 27

Characterized by regular spikes in the EKG tracing. It is related to poor grounding or external electricity interfering with the tracing.

Question 28

Wandering baseline

Answer 28

Results from poor electrode connection. It can be associated with lotions, oils, powders on the skin, or expired electrodes.

Question 29

Interrupted baseline

Answer 29

When there is a break in the tracing. It is usually related to a disconnected or broken lead wire.