ECG

Question 1

What does ECG mean

Answer 1

Electrocardiogram

Question 2

What do ECG’s do

Answer 2

Measures action potential of heart

Electrical changes in heart are measured and presented as an ECG

Question 3

How are ECG’s placed on body

Answer 3

Electrodes are placed on different parts of body to detect electrical impulses

A machine amplifies impulses during each heartbeat and records them

Question 4

ECG tracing diseases

Answer 4

If disease disrupts heart’s normal conduction pathway, there’s a disruption of expected ECG pattern (which is 60-100 beats per min at regular intervals)

ECG’s therefore can be used for diagnosing cardiovascular disease

Question 5

The Heart Beat

Answer 5

Heart contracts cuz a small cluster of cells (pacemakers) produce an electrical impulse, causing heart muscle to contract. There are three key stages of the heart:

P wave

QRS complex

T wave

Question 6

P wave

Answer 6

Reps depol of left and right atrium (upper chambers of heart)

Corresponde to atrial contraction

Question 7

QRS Complex

Answer 7

Includes Q/R/S waves, occurring at rapids succession

Reps electrical impulses as it spreads though ventricle (lower heart chambers), indicating ventricular depolarisation

So it contracts

Question 8

T Wave

Answer 8

Follows QRS complex indicating ventricular repol (recovery)

Question 9

Atria/ventricle moving blood in body

Answer 9

Atria moves blood into ventricles, which ven moves blood around body