EKG lecture 3 pt 2 highlights

Question 1

What does the direction of mean vector mean?

Answer 1

Mean Electrical axis or AXIS

Question 2

Normal QRS complex is how many degrees?

Answer 2

0 to +90

Question 3

QRS Axis normal if what?

Answer 3

QRS predominantly positive in I and aVF

Question 4

How do you find QRS axis?

Answer 4

Leads I and aVF
Normal = 0 to +90. LAD = 0 to – 90, RAD = +90 - + 180, ERAD = - 90 to + 180

Question 5

How do you find the P wave axis?

Answer 5

Find lead with nearly isoelectric (flat) p wave, axis is perpendicular
Normal = 0 to +70

Question 6

How do you find the T wave axis?

Answer 6

Find the lead with the flattest/ most isoelectric T wave, axis is perpendicular to this lead

Normal = approximates QRS axis – approximately within 50-60 degrees of QRS axis

Question 7

What does right axis deviation look like?

Answer 7

Lead AVF positive, lead 1 negative (during QRS)

Question 8

What does left axis deviation look like?

Answer 8

Lead 1 positive, AVF negative
(during QRS)

Question 9

What does extreme right axis deviation look like?

Answer 9

Lead 1 and lead AVF both negative
(during QRS)

Question 10

What does a normal axis look like?

Answer 10

Lead 1 and lead AVF both positive
(during QRS)

Question 11

Where should you look for P wave size?

Answer 11

Lead II and V1

Question 12

Chronic HTN may lead to ____________________ deviation on EKG

Answer 12

Left axis deviation (LAD)

Question 13

What would right ventricular hypertrophy look like on an EKG?

Answer 13

Right axis deviation exceeding +100 degrees