A First Look at the ECG Flashcards
What do standard limb leads look at?
Events in the vertical or frontal (coronal) plane
What do standard limb leads measure?
They record the spread of depolarisation in one limb with respect to another
What are the standard limb leads?
SLL I = Left arm wrt right arm
SLL II = Left leg wrt right arm
SLL III = Left leg wrt left arm
What causes an upward going blip?
A wave of approaching depolarisation
Which type of events are transmitted better, fast events or slow events?
Fast
What are the charges found at the right arm?
2 negatives
What are the charges found at the left arm?
1 positive, 1 negative
What are the charges found in the left leg
2 positives
A wave of depolarisation approaching the left leg will cause a ________ potential relative to the right arm.
Positive
A wave of depolarisation going away from the left leg will cause a ________ potential relative to the right arm.
Negative
A wave of repolarisation approaching the left leg will cause a ________ potential relative to the right arm.
Negative
A wave of repolarisation going away from the left leg will cause a ________ potential relative to the right arm.
Positive
What causes the P wave?
Atrial depolarisation
What causes the QRS complex?
Ventricular depolarisation
What causes the T wave?
Ventricular repolarisation
