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32 Cards in this Set

  • Front
  • Back
At what rate does the AV node fire?
40-60 BPM
At what rate does the Ventricles spontaneously fire?
30-45 BPM
Why won't the AV node and Ventricles fire their own beats?
They're suppressed by the SA node
Pathway of Electrical Conduction?
SA Node
Intratrial Pathways
AV Node
Bundle of His
Left and Right Bundle Branches
Purkinje Fibers
Endocardium
Epicardium
Apex--> Base
Who conducts the fastest?
His and Purkinje
What makes up a Lead?
A pair of electrodes
What does a little tiny square on an EKG represent?
0.1mV
and
.04 seconds
Which direction does the wave of depolarization of the atrium proceed in?
Towards Apex
What does this atrial depolarization create on the EKG?
P wave
Pause: what are the 4 main parts of electrophysiology represented in your normal EKG read out
Depolarization of Atrium
Depolarization of AV Node
Ventricular Depolarization
Ventricular Repolarization
So the P wave is the Atrial Depol, what represents the AV Depolarization?
The P-R Segment
What part represents the Ventricular Depol?
QRS
What about the ole Vent. Repol?
T wave
Ok...wait a sec...so the T wave = repolarization, but its positive on the readout...what gives?
Its b/c the repolarization proceeds in the opposite direction of depolarization
What direction do depol and repol proceed in then?
Repol goes outside (epicardium)-->in (endocardium)
Depol goes inside-->out
Normal Sinus Rhythm? Brady? Tach?
Normal: 60-100
Brady: <60
Tach > 100
Normal PR, QRS, and QT intervals?
PR: 3-4 small boxes
QRS: 2-3 small boxes
QT: .3-.46 sec (varies w/ HR)
A wave of depolarization moving TOWARD a POSITIVE electrode records a ______ deflection on the EKG?
POSITIVE
Which leads are in the horizontal plane?
V1-V6
Which lead is the ground lead?
Right Leg
Lead one sees?
RA--> LA
Lead 2 sees?
RA--> LL
Lead 3 sees?
LA --> LL
Six leads of the frontal plane?
I
II
III
aVR
aVL
aVF
Which leads are the bipolar? unipolar?
Bipolar: I, II, III
Unipolar: aVR, aVL, aVF
Angle of the 3 bipolar leads?
I: 0
II: 60
III: 120
Angle of 3 unipolar leads?
aVR: -150
aVL: -30
aVF: 90
Placement of Precordial Leads?
V1: 4th ICS, R sternum
V2: 4th ICS, L Sternum
V3: between V2 and V4
V4: 5th ICS MCL
V5: between V4 and V6
V6: 5th ICS MAL
What is an R' wave?
when there is a 2nd positive deflection after the R wave
What is a QS wave?
when there is a monophasic negative QRS complex
When should you Dx a prolonged QT segment?
when QT is more than 1/2 of R-R
Where does the normal QRS axis point?
Towards Apex of heart (more or less)