ECG Basics

Question 1

What speed should an ECG be performed at?

Answer 1

25mm/sec

Question 2

What is the correct location of the V5 electrode

Answer 2

5th intracostal space, Mid-clavicular line

Question 3

What is the correct location of the V2 electrode

Answer 3

4th intracostal space, Left sternal edge

Question 4

What is the rate?

Answer 4

140-160 (300/2 large squares)

Question 5

What does the P wave represent?

Answer 5

Atrial Depolarisation

Question 6

What is the rate?

Answer 6

70-80 (13 complexes x 6)

Question 7

What is the diagnosis?

Answer 7

Atrial Fibrillation (Irregularly irregular with no P waves)

Question 8

What is the diagnosis?

Answer 8

Left Axis Deviation (I and III are leaving / Lead I is +ve and lead aVF is -ve)

Question 9

What is the diagnosis?

Answer 9

1st Degree Heart Block (prolonged and fixed P-R Interval)

Question 10

Which lead is this?

Answer 10

Lead II

Question 11

What is the diagnosis?

Answer 11

High rate, regular but wide complexes)

Question 12

What is the diagnosis?

Answer 12

Sinus Tachycardia (Normal P-QRS-T waves but bad baseline)

Question 13

What does the T wave represent?

Answer 13

Ventricular Repolarisation

Question 14

What is this Rhythm?

Answer 14

Ventricular Fibrillation (Wide and irregular complexes)

Question 15

What is this lead?

Answer 15

aVR

Question 16

What is the diagnosis?

Answer 16

Right Axis Deviation (I and III are returning / Lead I is -ve and lead aVF is +ve)

Question 17

What is the diagnosis?

Answer 17

Second Degree HB –Mobitz I (elongating P-R interval with dropped beat)

Question 18

What is the diagnosis?

Answer 18

Normal Sinus

Question 19

What is the diagnosis?

Answer 19

P.E - Right heart strain - SIQIIITIII – Deep S and Q and TWI

Question 20

What are the causes of RAD?

Answer 20

RBBB, Lateral MI, RVH

Question 21

What is the diagnosis?

Answer 21

RBBB – V1 - MoRRoW

Question 22

What is the diagnosis?

Answer 22

LBBB (V1 – WiLLiaM)

Question 23

What colour is this lead?

Answer 23

Green (RIDE YOUR GREEN BIKE in clockwise order from right hand)

Question 24

What is the diagnosis?

Answer 24

Pericarditis (Widespread saddle ST elevation)

Question 25

What does a deep & wide Q wave indicate

Answer 25

Old Ischemia

Question 26

What is the diagnosis?

Answer 26

Anterolateral STEMI (ST elevation in Leads V1 to V6)

Question 27

What is the upper limit of the ORS Interval

Answer 27

Over 3 small squares/ 0.12 seconds

Question 28

What is the abnormality?

Answer 28

WPW (Short PR interval and delta wave)

Question 29

What is the diagnosis?

Answer 29

2nd Degree Block – Mobitz II (Prolonged but fixed PR interval and then dropped beats)

Question 30

What does an abnormally deep S wave and tall R wave indicate?

Answer 30

Left Ventricular Hypertrophy (LVH)

Question 31

What is the diagnosis?

Answer 31

Inferior STEMI (ST elevation in II, III and aVF)

Question 32

What is the upper limit of the PR Interval?

Answer 32

Over 5 small squares/0.2 seconds

Question 33

What is the diagnosis?

Answer 33

Hyperkalaemia (Tall T waves in all leads)

Question 34

What is the diagnosis?

Answer 34

3rd Degree HB (Complete dissociation between P waves and QRS complexes)

Question 35

What is the diagnosis?

Answer 35

Lateral NSTEMI (T wave inversion in I, aVL, V4, V5, V6)

Question 36

What is the diagnosis?

Answer 36

Posterior MI (ST depression in Anterior Leads)