Segments and Intervals

Question 1

What is the P wave

Answer 1

Atrial Depolarisation

Question 2

What is the PR segment

Answer 2

Electrical impulse being help at the AV node

Question 3

What is the PR interval

Answer 3

Start of atrial depolarisation (p wave) to the start of ventricular depolarisation (QRS) complex

Question 4

What is the QRS complex

Answer 4

Ventricular depolarisation

Question 5

What is the ST segment

Answer 5

Section from end of ventricular depolarisation to the start of ventricular repolarisation

Question 6

What is the T wave

Answer 6

Ventricular depolarisation

Question 7

What is the QT interval

Answer 7

Time from the start of the ventricular depolarisation to the end of ventricular repolarisation

Question 8

What is the RR interval

Answer 8

Time between each complex (dependent on rate)

Question 9

How long is the PR interval

Answer 9

3-5mm
(120 - 200 ms)

Question 10

How long is the QRS interval

Answer 10

2-3mm
(80 - 110/120 ms)

Question 11

How long is the QT interval

Answer 11

<440 ms in men
<460 ms in woman

Question 12

What is the J point

Answer 12

Start of ST segment

If the J point is above the isoelectirc line then it is STEMI

If the J point is lower than the isoelectric line then it is NSTEMI