Week 3 and 4

Question 1

The system of positioning of leads for performing

Answer 1

a 12 lead ECG is universal

Question 2

What is ensured of by the system of positioning of leads for performing a 12 lead ECG is universal

Answer 2

This helps to ensure that when a person’s ECGs are compared, any changes on the ECG are due to cardiac injury, not a difference in placement of leads, this is extremely important with the increasing use of foreign travel. There are universal standards in place through out the world.

Question 3

Name the four common causes of artifact?

Answer 3

1. Patient Movement
2. Loose or defective electrodes
3. Improper grounding
4. Faulty ECG apparatus

Question 4

What is crucial in artifact?

Answer 4

Patient assessment

Question 5

What are the 5 questions when reading a rhythm strip?

Answer 5

1. Are P-P Waves present
2. Are P-P Waves occurring regularly?
3. Is there a P-P -Waves for each QRS?
4. Are the P-P-Waves smooth, rounded,and upright in appearance, or are inverted?
5. Do all P P-Waves look similar?

Question 6

What is the Normal length of the P-R interval?

Answer 6

Normal length of the PRI IS 0.12 to 0.20 second ( 3-5 small squares)

Question 7

What are the three questions to ask for the P-R interval

Answer 7

1. Are PRI greater than 0.20 seconds?
2. Are PRI less than 0.21 seconds?
3. Are the PRI’s constant across the ECG?

Question 8

What is the normal length of the PRI

Answer 8

0.12 to 0.20 seconds (3-5