EKG

Question 1

What is the inherent rate of the SA node?

Answer 1

60-100 BPM

Question 2

What is the inherent rate of the AV node?

Answer 2

40-60 BPM

Question 3

What is the inherent rate of the ventricles?

Answer 3

20-40 BPM

Question 4

What does the parasympathetic nervous system vagus nerve do?

Answer 4

Decreases rates
Slows impulse conduction
Decreases force of contraction

Question 5

What does the sympathetic nervous system do?

Answer 5

Increases rate

Increases force of contraction

Question 6

How long is each little box?

Answer 6

0.04 seconds

Question 7

What is the P wave?

Answer 7

Atria contracting

Question 8

What is the QRS complex?

Answer 8

Ventricles contracting

Question 9

What is the T wave?

Answer 9

Repolarization of ventricles

Question 10

What is the ST interval?

Answer 10

The complete time for repolarization

Question 11

How long should a PR interval be?

Answer 11

0.12-0.20 seconds

Question 12

How do you measure a PR interval

Answer 12

From the beginning of the P wave until where the R wave begins

Question 13

How long should a QRS interval be?

Answer 13

<0.12 seconds

Question 14

How do you measure the QRS interval?

Answer 14

Measure from beginning of Q wave to S

Question 15

How do you find the HR using EKG 6 second strip?

Answer 15

Count QRS complexes and multiply by 10

Question 16

How many BPM in 1 big box?

Answer 16

300

Question 17

How many BPM in 2 big boxes?

Answer 17

150

Question 18

How many BPM in 3 big boxes?

Answer 18

100

Question 19

How many BPM in 4 big boxes?

Answer 19

75

Question 20

How many BPM in 5 big boxes?

Answer 20

60

Question 21

How many BPM in 6 big boxes?

Answer 21

50

Question 22

How many BPM in 7 big boxes?

Answer 22

43

Question 23

What causes cardiac contraction to begin?

Answer 23

Depolarization of cardiac cells

Question 24

What is automaticity?

Answer 24

The ability of cardiac cells to initiate an impulse spontaneously and continuously

Question 25

What is contractility?

Answer 25

The muscle responding and squeezing

Question 26

What is excitability?

Answer 26

The ability of cardiac cells to respond to an electrical impulse

Question 27

What is conductivity?

Answer 27

Related to transmission of the impulse from one fiber to another

Question 28

What metaphor can be used to remember the AV node?

Answer 28

AV node is a bouncer - only letting a certain amount of people into the club at a time

Question 29

What does a prolonged QT interval increase the risk of?

Answer 29

Lethal ventricular arrhythmia

Question 30

What does a QRS complex of >0.12 seconds indicate?

Answer 30

Bundle branch block

Question 31

How long is the QT interval usually?

Answer 31

0.32 to 0.40 if the HR is between 65-95