ECG

Question 1

In normal sinus morphology, the P wave is ____ in lead __ and ____ in lead __

Answer 1

upright in lead II; down in lead VI

Question 2

Differences in atrial morphology; or when the P wave is down in lead II and only up in lead V1

Answer 2

ectopic atrial rhythm

Question 3

examples of ectopic atrial rhythm

Answer 3

atrial tachycardia; junctional rhythm

Question 4

normal QRS complex is upright in these 2 leads

Answer 4

lead I and avF

Question 5

limb leads

Answer 5

I, II, III, avR, avL, and avF

Question 6

precordial leads

Answer 6

V1-V6

Question 7

axis of lead I

Answer 7

0 degrees

Question 8

axis of lead II

Answer 8

+60 degrees

Question 9

axis of avF

Answer 9

+90 degrees

Question 10

normal cardiac axis is between

Answer 10

-30 to 90 degrees

Question 11

left axis deviation (LAD) is anywhere between

Answer 11

-30 to -90 degrees

Question 12

right axis deviation (RAD) is anywhere between

Answer 12

+90 to +180 degrees

Question 13

these leads should have a positive QRS complex

Answer 13

I, II, avF

Question 14

Diagram of cardiac axis going clockwise

Answer 14

0 degrees (I), +60 degrees (II), +90 degrees (avF), +120 degrees (III), -150 degrees (avR), -30 degrees (avL)

Question 15

examples of left axis deviation

Answer 15

left anterior block, LVH, left BBB

Question 16

examples of right axis deviation

Answer 16

RBBB, RVH

Question 17

This wave becomes bigger and bigger through V1-V6

Answer 17

r wave

Question 18

when there is 2 r waves or “bunny ears”

Answer 18

RBBB

Question 19

This wave becomes smaller and smaller through V1-V6

Answer 19

s wave

Question 20

normal duration of QRS complex

Answer 20

0.08-0.10 sec

Question 21

atrial depolarization

Answer 21

P wave

Question 22

ventricular depolarization

Answer 22

QRS

Question 23

ventricular repolarization

Answer 23

T wave

Question 24

normal QT duration

Answer 24

0.4 to 0.44 sec

Question 25

occur when a site outside of the sinus node, but within the atria, creates action potentials faster than the sinus node.

Answer 25

atrial tachycardia

Question 26

If there is widened QRS complex (>120 ms) and downward defected in V1, then a ____ is present

Answer 26

Left BBB

Question 27

If there is widened QRS complex (>120 ms) and upward defected in V1, then a ____ is present

Answer 27

Right BBB