ECG basics

Question 1

On ecg papper , one small box is = to

Answer 1

.04 sec ( 40 milliseconds)

Question 2

One large box consist of

Answer 2

5 small boxes= .20 seconds or 200 milliseconds

Question 3

Pri interval is measured from

Answer 3

start of p to the start of qrs

Question 4

Normal pri interval is what duration

Answer 4

.12-.2 milli sec

Question 5

what is the normal qrs duration

Answer 5

less than 1.2 milli sec

Question 6

The firtst negative deflection in qrs is called

Answer 6

Q wave

Question 7

q wave represents

Answer 7

electricity from right to left of septum in heart.

Question 8

Q wave should measure

Answer 8

No more than 40 milli sec and be less than 1/3 the overall height of the qrs

Question 9

R wave is the first …

Answer 9

upword deflection

Question 10

S wave is located….

Answer 10

at the first downward deflection after the r wave

Question 11

What is the j point

Answer 11

where qrs ends and ST segment begins. Represents end of depolarization and begaining of repolarization.

Question 12

Why is j point significant

Answer 12

It often depresses or elevates when myocardium is ischemic.

Question 13

ST segment starts and ends where?

Answer 13

begains at j point and ends at T wave.

Question 14

T wave represents….

Answer 14

Ventricular repolarization

Question 15

What characteristics should the t wave have?

Answer 15

1. It should be asymmetric
2. be less than half the height of qrs complex.
3. Be oriented in the same direction as what the qrs is prodominatly.

Question 16

what is the five step method to identifying dysrithmias?

Answer 16

1. Identify the waves ( p-qrs-t)
2. Measure the pri
3. measure the qrs duration
4. Determine the rhythm regularity
5. Measure the heart rate

Question 17

You will exclusivley use what lead to perform dysrithmia interpertation?

Answer 17

Lead 2

Question 18

What are you looking for in regards to p waves?

Answer 18

1. Are they present
2. Are they upright
3. Are they within normal parameters?

Question 19

How do you determine rhythem regularity?

Answer 19

1. measure distance between r waves
2. if exactly the same its regular
3. if no two r waves are equal distance its irregularly irregular
4. if r waves are irregualar but follow a pattern its regular irregular.​

Question 20

Determining heart rate

Whats the fastest method?

Answer 20

The 6 second method.

Question 21

When is the six second method best used ?

Answer 21

• irregular and for those that appear between 50 - 150 beats/ min

Question 22

How do you use the six second method?

Answer 22

Multiply the number of qrs complexes by 10

Question 23

What is the sequence of the sequence method?

Answer 23

• 300
• 150
• 100
• 75
• 60
• 50
• 43
• 37