3. Enlargement, Dev, Hypertrophy

Question 1

Right atrial enlargement

Answer 1

First part of p wave

II: Taller then 2.5mm

V1: Initial component of biphasic p wave taller

Question 2

Left atrial enlargement

Answer 2

Lead II: wide p wave

V1: wide biphasic p wave

Amplitude normal or increased risk

Question 3

Normal axis

Answer 3

I: positive

aVF: positive

Question 4

Left axis deviation

Answer 4

I: positive

aVF: negative

Question 5

Right axis deviation

Answer 5

I: negative

aVF: positive

Question 6

Extreme right axis deviation

Answer 6

I: negative

aVF: negative

Question 7

Criteria for right ventricular hypertrophy

Answer 7

1. Right axis deviation
2. Poor R wave progression

V1 : R wave > S wave
V6: S wave > R wave

Question 8

Criteria for left ventricular hypertrophy

Answer 8

OBVIOUS

left axis deviation
V5: R wave exceeds 26mm
V6: R wave exceeds 18mm

R wave in V6 exceeds R wave amplitude in V5

R wave amplitude in V5 or V6 plus S wave amplitude in V1 or V2 exceeds 35mm

Question 9

Hypertrophy

Answer 9

Atria = enlarge p wave

Ventricles = enlarge QRS

Question 10

R wave progression

Answer 10

Pattern of progressively increasing R wave amplitude moving right to left in precordial leads