Intro to ECG Part 1 Flashcards
movement of the charge:
if a postive charge moves away from the positive electrode, a ____ deflection is created.
a downward deflection.

movement of the charge:
if charge is moving, but not directly toward the positive lead, the deflection will be ___
will be smaller.

movement of the charge:
if the charge moves toward and then away, a ___ waveform will be created
if the charge moves toward and then away, a BIPHASIC waveform will be created.

movement of the charge:
if the charge moves perpendicular to the leads, then a ____ deflection results
then a very very small deflection results.

movement of the charge:
when will there be no deflection on the lead?
- if the charge is not moving
- if the tissue is very small
All 6 limb leads are ___ degreees apart.
30 degrees apart

einthoven’s triangle
the sum of all 3 leads is 0

positioning of 6 precordial leads

which leads are limb leads? Which ones are precordial?






how to calculate the rate in an ECG lead?

To calculate: 300 divided by number of big squares between beats
300/4 = 756 bpm
calculate the rate

300/2 = 150

there are 3 types of rhythm
regular
irregular with a pattern
irregular with no pattern
analyze the rhythm

regular but fast
analyze the rhythm

skipped a beat
analyze the rhythm

irregular with a pattern
analyze the rhythm

irregular with no pattern
note:

interpret this ECG

Nonexistant P wave– very diminished
interpret this ECG

P waves are present, and they are all on the same size and shape. BUT there are not as many QRS segments compared to P segments. There are more.
what does it mean if there are P waves without QRS’s?
AV node is not working properly or there is an SA block in the conduction between atria and ventricle.
the P wave indicates atrial depolarization. if there is no QRS, something is wrong with the ventricle. either something isn’t reaching the ventricle or it isn’t contracting
what is going on to the P waves? Why is there still a QRS?

These are not P waves– this is baseline garbage. there is no atria conduction. It’s even hard to determine the T wave.
This is atrial fibrillation. Can get QRS wihtout the P wave because there might be a pacemaker somewhere else in the heart that allows the ventricle to receive electricle stimulation even if the SA node is not functioning properly.
A p wave inversion can happen if the ___ node is the pacemaker rather than the ___ node.
A p wave inversion can happen if the AV node is the pacemaker rather than the SA node.














