ECG

Question 1

What is a ECG?

Answer 1

Elctrocardiogram record the electrical activity of the heart from different angles

Question 2

what is a P wave

Answer 2

P waves represent atrial depolarisation.

In healthy individuals, there should be a P wave preceding each QRS comple

Question 3

what is a PR interval

Answer 3

The PR interval begins at the start of the P wave and ends at the beginning of the Q wave.

It represents the time for electrical activity to move between the atria and the ventricles.

Question 4

what is a QRS complex

Answer 4

The QRS complex represents the depolarisation of the ventricles.

It appears as three closely related waves on the ECG (the Q, R and S wave

Question 5

what is a ST segment

Answer 5

The ST segment starts at the end of the S wave and ends at the beginning of the T wave.

The ST segment is an isoelectric line representing the time between depolarisation and repolarisation of the ventricles (i.e. ventricular contraction).

Question 6

what is T wave

Answer 6

The T wave represents ventricular repolarisation.

It appears as a small wave after the QRS complex.

Question 7

what is RR interval

Answer 7

The RR interval begins at the peak of one R wave and ends at the peak of the next R wave.

It represents the time between two QRS complexes.

Question 8

QT interval

Answer 8

The QT interval begins at the start of the QRS complex and finishes at the end of the T wave.

It represents the time taken for the ventricles to depolarise and then repolarise.

Question 9

what does a small square represent on a ECG paper?

Answer 9

0.04 seconds

Question 10

what does a large square represent on a ecg paper?

Answer 10

0.2 seconds

Question 11

5 large squares on a ecg paper represents?

Answer 11

1 second

Question 12

300 large squares on a ecg paper represents?

Answer 12

1 minute

Question 13

what is a ECG electrode

Answer 13

An ECG electrode is a conductive pad attached to the skin to record electrical activity.

Question 14

what is a ECG lead?

Answer 14

An ECG lead is a graphical representation of the heart’s electrical activity which is calculated by analysing data from several ECG electrodes.

Question 15

what does ride your green bike stand for

Answer 15

red, yellow, green, blue

Question 16

were is V1 electrode located?

Answer 16

4th intercostal space at the right sternal edge

Question 17

were is v2 electrode located?

Answer 17

4th intercostal space at the left sternal edge

Question 18

were is v3 electrode located?

Answer 18

Midway between the V2 and V4 electrodes

Question 19

were is V4 electrode located?

Answer 19

5th intercostal space in the midclavicular line

Question 20

were is v5 electrode loccated?

Answer 20

Left anterior axillary line at the same horizontal level as V4

Question 21

were is v6 electrode located?

Answer 21

Left mid-axillary line at the same horizontal level as V4 and V5

Question 22

were does the red electrode go?

Answer 22

Ulnar styloid process of the right arm

Question 23

were does the yellow electrode go?

Answer 23

Ulnar styloid process of the left arm

Question 24

were does the green electrode go?

Answer 24

Medial or lateral malleolus of the left leg

Question 25

were does the black electrode go?

Answer 25

Medial or lateral malleolus of the right leg