ECG Flashcards
What is a ECG?
Elctrocardiogram record the electrical activity of the heart from different angles
what is a P wave
P waves represent atrial depolarisation.
In healthy individuals, there should be a P wave preceding each QRS comple
what is a PR interval
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.
what is a QRS complex
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
what is a ST segment
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).
what is T wave
The T wave represents ventricular repolarisation.
It appears as a small wave after the QRS complex.
what is RR interval
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.
QT interval
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.
what does a small square represent on a ECG paper?
0.04 seconds
what does a large square represent on a ecg paper?
0.2 seconds
5 large squares on a ecg paper represents?
1 second
300 large squares on a ecg paper represents?
1 minute
what is a ECG electrode
An ECG electrode is a conductive pad attached to the skin to record electrical activity.
what is a ECG lead?
An ECG lead is a graphical representation of the heart’s electrical activity which is calculated by analysing data from several ECG electrodes.
what does ride your green bike stand for
red, yellow, green, blue
were is V1 electrode located?
4th intercostal space at the right sternal edge
were is v2 electrode located?
4th intercostal space at the left sternal edge
were is v3 electrode located?
Midway between the V2 and V4 electrodes
were is V4 electrode located?
5th intercostal space in the midclavicular line
were is v5 electrode loccated?
Left anterior axillary line at the same horizontal level as V4
were is v6 electrode located?
Left mid-axillary line at the same horizontal level as V4 and V5
were does the red electrode go?
Ulnar styloid process of the right arm
were does the yellow electrode go?
Ulnar styloid process of the left arm
were does the green electrode go?
Medial or lateral malleolus of the left leg
