ECG basics

Question 1

Leads 1-3 are ______ leads

Answer 1

Limb

Question 2

Leads aVR, aVL, aVF are _____ leads

Answer 2

Augmented limb

Question 3

Leads V1-V2 view what part of the heart?

Answer 3

Septum

Question 4

Leads V3-V4 view what part of the heart?

Answer 4

Anterior (front) wall of the left ventricle

Question 5

Leads V5-V6 view what part of the heart?

Answer 5

Lateral (side) wall of the left ventricle

Question 6

aVL Lead views what part of the heart?

Answer 6

Lateral surface of the left ventricle

Question 7

aVF Lead views what part of the heart?

Answer 7

Inferior surface of the left ventricle

Question 8

Lead 1 views what part of the heart?

Answer 8

Lateral surface of the LV

Question 9

Lead 2 views what part of the heart?

Answer 9

Inferior surface of the LV

Question 10

ECG paper, 1 small/big box = seconds

Answer 10

Small: 0.04 seconds
Big: 0.20 seconds

Question 11

What two leads are reflections

Answer 11

Leads 2 & aVR

Question 12

P wave: happening, time, amp

Answer 12

Atrial depolarization, <0.11 sec, <2.5 mm

Question 13

Time AV node delays impulse, ECG segment

Answer 13

0.12-0.20 seconds
PR interval

Question 14

QRS complex: happening, time,

Answer 14

Ventricular depolarization
0.11 seconds

Question 15

Q wave: happening, time, amp

Answer 15

Conduction through intraventricular septum
< or equal 0.04 seconds
< or equal 1/3 overall hight
Negative deflection

Question 16

R wave

Answer 16

Positive deflection after Q wave
Ventricular depolarization

Question 17

S wave

Answer 17

Any negative deflection after R wave
Ventricular depolarization

Question 18

J point

Answer 18

Where QRS segment ends and ST segment begins
End depolarization, start Repolarization

Question 19

ST segment, happening, elevated vs depressed

Answer 19

Early ventricular repolarization
Elevated - myocardial injury
Depressed - ischemia

Question 20

T wave, happening, amp

Answer 20

Ventricular Repolarization
Half overall QRS hight & oriented same direction

Question 21

Two halves of T wave

Answer 21

First half represents absolute refractory period (ARP)
Second half represents relative refractory period (RRP)

Question 22

Tall, pointed T waves
Depressed ST segment

Answer 22

Hyperkalemia

Question 23

Deep, inverted T waves,

Answer 23

Acute CNS event (ex intracranial hemorrhage, stroke)

Question 24

Dulled u + n waves (T wave)

Answer 24

Hypokalemia or cardiomyopathy

Question 25

QT interval: happening, time

Answer 25

Ventricular depolarization and Repolarization
0.39 sec to 0.46 sec

Question 26

Ectopic

Answer 26

Impulse/rhythm that originated from a site other than the SA node