Data Interpretation

Question 1

Which ECG leads correspond to the anterior wall of the heart?

Answer 1

V1-V4

Question 2

Which ECG leads correspond to the lateral wall of the heart?

Answer 2

V5, V6, I, AVL

Question 3

Which ECG leads correspond to the inferior wall of the heart?

Answer 3

II, III, AVF

Question 4

ST depression in V1-V4 may indicate what?

Answer 4

Posterior STEMI

Question 5

Give the blod supply to the anterolateral, inferior and posterior walls of the heart?

Answer 5

Anterolateral= LAD
Inferior= right coronary 
Posterior = circumflex

Question 6

What does pericarditis look like on ECG?

Answer 6

Global saddle-shaped ST elevation, prolonged PR interval

Question 7

What is the definition of ST elevation?

Answer 7

> 1mm in >2 leads

Question 8

What is the normal pattern of QRS progression?

Answer 8

Negative in V1, V2
Isoelectric in V3
Positive in V4, V5, V6

Question 9

What is the definition of poor R wave progression?

Answer 9

R wave height <3mm in V3

Question 10

The ECG reveals tall R waves (<35mm), cause?

Answer 10

LVH- more muscle = bigger wave of depolarisation= bigger R wave

Question 11

What is the effect of hypercalcaemia on QT length

Answer 11

Hypercalcaemia= prolonged QT

note hypocalcaemia short QT

Question 12

ECG reveals a prolonged QT,

differentials?

Answer 12

MI, ischaemia, structural heart disease, LVH,
LBBB, RBBB
Hypo K, Mg, Ca

Question 13

ECG reveals T wave inversion in a regional pattern e.g V1-V4, diangosis?

Answer 13

NSTEMI or structural HD

Question 14

A patient with a posterior STEMI would have what features on ECG?

Answer 14

ST depression in V1-V3

(V1-V3 reflect the opposite of what is happening on posterior wall so “ST elevation in V7-9” becomes ST depression in V1-V3

Question 15

T wave inversion seen in single leed e.g AVR or III, indicates???

Answer 15

Normal variant