ECGs Revisited Flashcards
What part of ECG equipment is an electrode?
The thing that sticks onto your chest
What part of ECG equipment are the cables/wires?
The wires connected to the electrodes
What part of ECG equipment are the leads?
They are the views of the heart
How are vectors represented?
By arrows
In what direction will a charge travelling towards a negative electrode travel?
Down
In what direction will a charge travelling towards a positive electrode travel?
Up
What direction is the charge travelling if the line is isoelectric?
Perpendicular to both the anode and the cathode
What does the steepness of the electrode denote?
The velocity of the action potential
What does the width of the deflection denote?
The duration of the event
How does the thickness of the muscle affect deflection?
Thinner muscle creates a smaller deflection
How many limb leads and how many chest leads are there?
3 limb leads
6 chest leads
What rule is used to remember where the leads go? How does it work?
Rule of Ls
Lead 1= one L= right arm to Left arm
Lead 2= two Ls= right arm to Left Leg
Lead 3= Left arm to Left Leg
For the leads, what rule is used to work out which is the anode and which is the cathode? How does it work?
The rule of reading
In english we read from left to right and up to down
For each lead either go left to right or up to down and always start with the anode
Where exactly is V1 placed?
4th intercostal space at right border of the sternum
Where exactly is V2 placed?
4th intercostal space at the left border of the sternum