12-lead ECG interpretation Flashcards Preview

CVPR: CV Unit I > 12-lead ECG interpretation > Flashcards

Flashcards in 12-lead ECG interpretation Deck (13):
1

Information provided by leads V1 & V2

-close to right ventricle
-also close to septum --> can see septal infarcts
-increased voltage from R ventricular hypertrophy seen here

2

Information provided by leads V5 & V6

-close to left ventricle, esp. @ anterolateral portion
-anterolateral infarcts becomes visible
-increase voltage from L ventricular hypertrophy seen here

3

Normal direction of depolarization of ventricles

-from R to L
-downward from R arm to L leg

4

"Negative" leads

-aVR (@ R arm)
-V1 & V2

5

"Positive" leads

-Leads I & II

6

Normal QRS axis and corresponding leads

-QRS axis = +90deg. (straight down) to -30deg. (slightly above horizontal)
-Lead I = @ 90deg.
-Lead II = @ -30deg.

7

Normal axis @ leads I and II

-Lead 1=positive
-Lead 2=positive

8

Left axis @ leads I and II

-Lead 1=positive
-Lead 2=negative

9

Right axis @ leads I and II

-Lead 1=negative
-Lead 2=positive

10

Intermediate axis @ leads I and II

-Lead 1=negative
-Lead 2=negative

11

EKG changes in Right bundle branch block

-wide QRS
-tall late positive deflection @ right-sided leads (V1 & V2)
-negative deflection + wide S @ left-sided leads (I & V6)

12

EKG changes in Left bundle branch block

-wide QRS
-negative deflection @ right leads (V1)
-positive deflection @ L lead (V6)

13

EKG changes in distal left bundle branch blocks

-distal blocks --> axis shifts
-@ anterior fascicle = L axis deviation
-@ posterior fascicle = R axis deviation
-QRS not significantly prolonged