ECG

Question 1

What are the three standard leads (bipolar)

Answer 1

Lead axis as atria and ventricles depolarise
Lead 1 - RA–> LA
Lead 2 - RA –> LL
Lead 3 - LA –> LL

Question 2

What gives an upward deflection

Answer 2

moving towards recording electrode

Question 3

What are the parts of the ECG and the length

Answer 3

P - atrial depo (0.08-0.1s)

QRS complex - ventricular depo (

Question 4

What does the 3 augmented limb leads (unipolar) mean

Answer 4

One positive electrode with two negative linked

Invoke left foot also

Question 5

6 chest (precordial) leads - unipolar

Answer 5

Know positioning

Question 6

What is the ECG rhythm strip

Answer 6

Prolonged recording of one lead
Usually standard limb lead 2
Allows you to detect thyrhm disturbance

Question 7

Why use 12 leads

Answer 7

Look at heart from diff directions
Determine axis of heart in thorax
Look for any issues

Question 8

A normal ECG doesn’t exclude significant heart disease such as

Answer 8

Myocardial infarction
Intermittent rhythm disturbance
Stable angina

Question 9

Electrical activity within cardiac muscles cells cause

Answer 9

Current flow in heart
Current flow in surrounding tissues
Potentail differences between distant sites on body surface measurable by electrodes placed on skin coupled to a sensitive recording device the electrocradiogrpah