Ecg

Question 0

What does the QRS complex represent

Answer 0

Ventricular depolarization and its contraction

Question 1

What does P wave represent

Answer 1

Atrial depolarization

Question 2

What does the T wave represent

Answer 2

Ventricular repolarization

Question 3

What does the PR interval represent

Answer 3

Represents conduction from the AV node through the bundle of his

Question 4

What does the ST segment represent

Answer 4

Early part of ventricular repolarization

Question 5

What causes myocardial contraction aka systole

Answer 5

Myocardial cell depolarization

Question 6

What causes myocardial relaxation

Answer 6

Myocardial cell repolarization

Question 7

What is the vector, or sum total, of all the electrical forces during any given cardiac cycle called

Answer 7

Wave of depolarization

Question 8

As a wave of depolarization moves toward a positive electrode what type of deflection is observed on the ECG

Answer 8

Positive deflection

Question 9

As the wave of depolarization moves away from a positive electrode what type of deflection is seen on the ECG

Answer 9

Negative deflection

Question 10

What initiates the pathway for the conduction of wave depolarization?

Answer 10

SA node

Question 11

From where does the final wave of depolarization spread across the ventricles in an inferolateral direction

Answer 11

Perkinje fibers

Question 12

What does the x axis on the ECG grid represent

Answer 12

Time

Question 13

What is the unit of time per each small box?

Answer 13

0.04 seconds

Question 14

What is the time unit per big box

Answer 14

0.20 seconds

Question 15

What do the y axis represent on an ECG

Answer 15

Voltage

Amount of electricity generated by the Myocardial cells

Question 16

Why is a QRS complex have a higher deflection compared to the p wave

Answer 16

The height of any given wave form is a function of the amount of muscle mass it represents and the ventricles have more muscle mass

Question 17

Depolarization of the atria normally begins where .

Answer 17

SA node

Question 18

What is the pathway of conduction through the heart

Answer 18

SA node, AV node, bundle of his, bundle branches, and perkinje fibers

Question 19

What is the result of sodium and calcium ion flux that produces atrial depolarization and contraction

Answer 19

P wave

Question 20

Which is slower conduction velocity through the av node or sa node

Answer 20

Conduction through the AV node is slower

Question 21

Why is the conduction through AV node slower than that of the SA node?

Answer 21

To allow time for the atria to contract and “top off” blood to the ventricles and enhance ventricular contraction

Question 22

What part of the ECG would you assess to see presences of an MI

Answer 22

ST segment looking for any changes

Typically depression of st segment

Question 23

What is the isoelectric line of an ECG

Answer 23

The line of equal charge or the midpoint of depolarization and repolarization

Question 24

An ECG that presents with p waves that resemble a sawtooth pattern is termed what?

Answer 24

A flutter

Question 25

What is characterized by repetitive firing of a single ectopic atrial focus with periodic transmission of the depolarization wave through the AV node down to the ventricles

Answer 25

A flutter

Question 26

What is characterized as multiple ectopic foci, all firing at random throughout the cardiac cycle

Answer 26

A fib

Question 27

When do heart blocks occur

Answer 27

When the conduction from the SA node to the AV node gets altered

Question 28

How long is a normal PRI

Answer 28

.12-.20 | 3-5 small boxes

Question 29

How long is a normal QRS complex?

Answer 29

.04-.10 | 1-2.5 small boxes

Question 30

When p waves have no relation to QRS

Answer 30

3rd degrees heart block

Question 31

What is it called when the p waves change morphology

Answer 31

Wandering atrial pace maker

Question 32

When there is more than one p wave for each QRS

Answer 32

A-flutter

Question 33

What is it have called when the p wave of the early beat has a different appearance

Answer 33

PAC

Question 34

What is the memorization method

Answer 34

300-150-100-75-60-50

Question 35

Fires normally but no capture occurs- spikesnot followed by depolarization complexes

Answer 35

Failure to capture

Question 36

What do you think is happening if the t wave is inverted or flattened

Answer 36

Zone of ischemia

Question 37

Torsade de pointes occurs during what

Answer 37

V tach

Question 38

What is quivering of the ventricles with no caridac out put

Answer 38

V fib

Question 39

3 or more p waves in a row

Answer 39

V tach

Question 40

Ventricular depolarization occurs before SAnode fires

Answer 40

PVC

Question 41

PR interval is normal | however one dropped QRS

Answer 41

2nd degree heart block type II

Question 42

AV junction becomes primary pacemaker

Answer 42

Junctional rhythm

Question 43

Turbulent blood flow

Answer 43

A fib