Basics of EKGs

Question 1

P-wave

Answer 1

Atrial depolarization

Question 2

PR segment

Answer 2

AV node depolarization

Question 3

QRS complex

Answer 3

Ventricular depolarization

Question 4

ST segment

Answer 4

Continued ventricular depolarization (ventricles preparing to re-polarize)

Question 5

T wave

Answer 5

Ventricular re-polarization

Question 6

QT interval

Answer 6

Interval where ventricles depolarize and re-polarize

Question 7

Inferior wall leads

Answer 7

II/III/aVF

Question 8

Lateral wall leads

Answer 8

I/aVL/V₅/V₆

Question 9

Inferior wall leads

Answer 9

II/III/aVF

Question 10

Anteroseptal leads

Answer 10

V₁ - V₄

Question 11

Bipolar limb leads

Answer 11

3 of them:

I/II/III

These are placed on the limbs

Question 12

Augmented unipolar limb leads

Answer 12

3 of them:

aVF/aVL/aVR

Question 13

Precordial chest leads

Answer 13

6 of them:

V₁ - V₆

Called “precordial leads” because they are placed on the torso (precordium)

Question 14

Placement of electrodes for 12-lead ECG

(How many electrodes are there?)

Answer 14

10 electrodes

Question 15

Large box size

Answer 15

5 mm

Question 16

Large box duration

Answer 16

0.20 seconds

Question 17

Large box amplitude

Answer 17

0.5 mV

Question 18

Small box size

Answer 18

1 mm

Question 19

Small box duration

Answer 19

0.04 seconds

Question 20

Small box amplitude

Answer 20

0.1 mV