Introduction to Cardiac Electrophysiology Flashcards Preview

Cardio 1 > Introduction to Cardiac Electrophysiology > Flashcards

Flashcards in Introduction to Cardiac Electrophysiology Deck (10)
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1
Q

Ventricular myocyte

A

Na rushes in a depolarization…then K out while Ca in…then just K out in order to maintain

2
Q

Ik1

A

Inward rectifier that allows K flow out of the cell to keep potential negative during diastole

3
Q

Pacemaker cell

A

Current through F-type Na channels and T-type Ca channels allow it to reach the threshold of the L-type Calcium channels

4
Q

Sequence of activation

A

SA - atria - AV node - septum - purkinje - ventricular myocytes

5
Q

P
PR
QRS
T

A

Atrial depolarizaiton
Delay at AV
Ventricular depolarization
Ventricular repolarization

6
Q

aVR
aVF
aVL

A

Right arm + (-150)
Left leg + (90)
Left arm + (-30)

7
Q

I
II
III

A
  • RA to + LA (0)
  • RA to + LL (60)
  • LA to +LL (120)
8
Q

Leads measure

A

AP propogation

Will peak when half of cell is positive and half negative

Propogation from neg to positive…if flipped then peak will be negative

9
Q

Signal magnitude

A

Shows propogation direction

Big signals if AP propogate parallell or anti-paralell to their direction

10
Q

Mean QRS axis

A

Normal if complex mainly pos in leads 1 and 2

If QRS up in 1 and 2 stop

Otherwise find most isoelectric…look at lead perpindicular

If QRS up, then positive pole, if down then negative