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Flashcards in cardiac electrophysiology Deck (6)
1

observe the action potentials in relation to the ECG tracing

 

2

what type of an event does teh ECG show?

Electrical event (depolarization) not mechanical contraction

3

What type of action potential is this? and explain all reason you know it is and what happens in each phase!!

 

  • Ventricular Action potential b/c RMP is at -90mV
  • 4- RMP (diastole) 
  • 0- rapid depolarization Na+ influx
  • 1- transient repolarization Cl- influx and K+ efflux
  • 2- Plataeu Ca++ influx K+ efflux
  • 3- Repolarization (delayed or late) K+ efflux
  • 4- Na+ / K+ pump regains intracellular balance

 

4

See the picture to compare everything of last slide 

 

5

What type of muscle has a RMP at -90mV

Classic striated cardiac and Skeletal muscle

6

What type of action potential is this? and explain all reason you know it is and what happens in each phase!!

  •  SA node action potential b/c the RMP is -70mV
  • 4- (diastole) spontaneous depolarization to threshold K+ efflux and Na+ and Ca++ influx (Ca++ influx only during last 1/3 of phase)
  • 0- SLOW depolarization (notice the slanted line versus the abprupt straight line of the ventriculars fast depolarization) Ca++ and Na+ influx
  • 3- Repolarization K+ efflux
  • 4- Diastole again

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