ECG

Question 1

ECG lead placement?

Answer 1

V1 - 4th space RSE
V2 - 4th space LFE
V3 - between 
V4 - 5th mid clavicle
V5 - 5th anterior ancillary 
V6 - 5th mid axillary

Question 2

WHat does P wave represent?

Answer 2

Atrial depolarisation

Normal duration <0.12s, 3 small boxes.

Question 3

Where is PR interval measured?

Answer 3

Start of P to start of QRS

normal duration = 0.12 - 0.2

Question 4

QRS normal duration and representation?

Answer 4

<0.12s, ventricular depolarisation.

Question 5

Where is ST segment?

Answer 5

From start of S wave to start of T wave.

Question 6

T wave?

Answer 6

Ventricular depolarisation

Should be half the height of QRS complex.

Question 7

Right axis deviation would show what?

Answer 7

Negative deflection in lead 1

Positive deflection in lead 3 or AvF

Question 8

Left axis deviation would show what?

Answer 8

Positive deflection in Lead 1

Negative deflection in 3 or avF.

Question 9

How do you calculate rate?

Answer 9

300 / number of big boxes between R waves.

Question 10

How do you calculate an irregular rate?

Answer 10

Number of QRS in 30 large boxes times 10.

Question 11

Cause of righty axis deviaiton’/

Answer 11

Right ventricular hypertrophy and WPW.

Question 12

What MI do you see left axis deviaiton?

Answer 12

inferior MI.

Question 13

What MI is most likely to give an arrhythmia?

Answer 13

Inferior, RCA controls the SA node and AV node.