12 Lead ECG

Question 1

__ is responsible for the dominant amount of septal depolarization

Answer 1

LBB (left bundle branch)

Question 2

normally, the septum depolarizes from __ to ___

Answer 2

left to right

Question 3

v1 and v2 are ___ deflected

Answer 3

negatively

Question 4

QRS tallest at ___

Answer 4

V5

Question 5

R waves get taller from ___ to ___

Answer 5

v1 to v6

Question 6

precordial (vector) leads are __

Answer 6

unipolar

Question 7

precordial leads view electrical forces in __ plane

Answer 7

horizontal

Question 8

inferior wall MI causes ____

Answer 8

LAD (left axis deviation)

Question 9

lateral wall MI causes

Answer 9

RAD (right axis deviation)

Question 10

in obese people, __ is seen

Answer 10

LAD

Question 11

in tall thin people, ___ is seen

Answer 11

RAD

Question 12

4 factors effecting the electrical axis

Answer 12

MI
body built
ventricular hypertrophy
conduction abnormalities (hemiblocks)

Question 13

LAHB (left anterior hemiblock) causes

Answer 13

LAD

Question 14

RAHB (right anterior hemiblock) causes

Answer 14

RAD

Question 15

ECG sign of necrosis

Answer 15

pathological Q waves
deep broad Q, 25% of amplitude of R wave, > 0.04 seconds

Question 16

ECG sign of injury

Answer 16

changes in ST segment, can be elevated or depressed

Question 17

first sign of MI is

Answer 17

ST changes

Question 18

ECG sign of ischemia

Answer 18

inverted, sharply pointed and symmetrically shaped T waves

Question 19

MI of inferior wall of LV (which leads)

Answer 19

II, III, aVF

Question 20

Mi of anterior wall of LV (which leads)

Answer 20

V2, V3, V4

Question 21

MI of lateral wall of LV

Answer 21

I, aVL, V5, V6

Question 22

MI of septal wall (which leads)

Answer 22

V1 and V2

Question 23

MI of posterior wall of LV

Answer 23

v1m v2 to the posterior or mirror image of V1 and V2

Question 24

RV MI

Answer 24

V4R, V5R, V6R (place v4,5,6, to the right)